| Plagiostomum cinctum Meixner, 1938 | Jul 5, 1949 | | | |
| Plagiostomum striatum Westblad, 1956 | Jul 5, 1949 | 12 m | | |
| Pseudostomum klostermanni (Graff, 1874) | Jul 5, 1949 | 16 m | fine sand, seaweed | |
| Acrorhynchus caledonicus (Claperede, 1861) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Hyporhynchus armatus (Jensen, 1878) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Proporus venenosus (Schmidt, 1852) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Monoporus rubropunctata (O. Schmidt, 1852) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Promesostoma solea (Schmidt, 1857) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Promesostoma agile (Levinsen, 1879) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Hyporhynchus penicillatus (Schmidt, 1857) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. A single specimen among Zostera, Cawsand Bay. |
| Provortex rubrobacillus Gamble, 1893 | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Plagiostomum vittatum (Frey & Leuckart, 1847) | Aug-Sep 1892 | | | beds of Zostera that grow on the sandy bottom. |
| Plagiostomum vittatum (Frey & Leuckart, 1847) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Plagiostomum dioicum (Mecznikow, 1865) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Plagiostomum girardi (Schmidt, 1857) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Monotus albus (Levinsen, 1879) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Provortex affinis (Jensen, 1878) | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Proxenetes flabellifer Jensen, 1878 | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... In tide-pools on the north side of Cawsand Bay. |
| Convoluta paradoxa Ørsted, 1843 | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Convoluta flavibacillum Jensen, 1878 | Aug-Sep 1892 | | | rocks and tide-pools exposed at low water on the north side of the bay towards Picklecombe Fort... |
| Convoluta saliens (Graff, 1882) | Aug-Sep 1892 | | sand | This species is apparently rather rare at Plymouth. Among Zostera from Cawsand Bay is the habitat for it. The curious mode of progression by sudden leaps, which co-exists along with the usual method of movement, was first described by v. Graff.. |
| Plagiostomum caudatum Levinsen, 1879 | Aug-Sep 1882 | | | A single specimen dredged in Cawsand Bay among Zostera. |
| Oligocladus sanguinolentus (Quatrefage, 1845) | 1883 or earlier | | | Adult specimens were dredged off the Duke Rock, Millbay Channel, Cawsand Bay, and Stoke Point. |