188 ZIESENHENNE 



15. Arm length 6 times disk diameter. West Indies and Panamic. 73 



to 300 fathoms 



13. elaps hutktn 



15. Arm length 3 times disk diameter. S.W. Africa 



14. leonis* Doderlein 



16. Arms broad, not finely tapering at the tips 17 



16. Arms slender, finely tapering at tips 18 



17. Arm-spines 7 to 9, long, delicate, not flattened, slightly longer 

 than arm segment. Panamic 



15. variegatum Liitken 



17. Arm-spines 8 to 9, subequal, pointed, slightly more than one-half 

 the length of arm segment. Atlantic 



16. brevispinum (Say) 



18. Arm-spines 8 to 9, well spaced, not flattened, almost the length 

 of arm segment. Arm length 5 to 6 times disk diameter. Atlantic 



17. ;<3/2Mcrfi Liitken 



18. Arm-spines 9 to 10, broad, flat, closely compacted, about % the 

 length of arm segment; arm length less than 5 times disk dia- 

 meter. Atlantic 



18. holtnesii (Lyman) 



19. Arm-spines equal, arms short, length 3 to 4 times disk diameter. 

 Atlantic 



19. brevicaudum Liitken 



19. Lowest arm-spine largest, arm length 4 times disk diameter . . 20 



20. Arm-spines 8, short, compact, half the length of arm segment, 

 large granules on adoral plate. Locality doubtful. Pacific . . . 



20. tonganum* Liitken 

 20. Arm-spines 9 to 10, flat, less than length of arm segment, small 



granules on adoral plates. Atlantic 



21. appressum (Say) 



1. Ophioderma propinguum* 



Ophioderma prop'mqua Koehler, 1895, Mem. Soc. Zool. France, vol. 8, 



p. 404, pi. 9, fig. 5. 

 Ophioderma propinguum H. L. Clark, 1923, Annals South African Mus., 



vol. 13, p. 352. 



Java, East Indies, Indian Ocean. 

 This species seems to be valid but it is highly doubtful if it came from 

 the Indian Ocean as the genus has not been reported from that area since. 



