Bohmig L 1895 (citation)- description and illustration p 37 and plate III. Sargasso Sea. Also 4, 15, 26-28. Salensky W 1907 (citation)- comparison with H. ussowi. List of p 820. illustration with muscles. Dorjes J 1968 (citation)- lists. Dorjes J 1970 (citation)- definition p 264- in discussion p 261-265- reprint- good species.
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