230 Bulletin American Museum of Natural History. [Vol. XXXII, 



Station 5675. Southwest of San Cristobal Bay, west coast of Lower 

 California, 284 fms. Bottom Temp., 44.6°. 

 Four specimens. 



Psolus squamatus. 



Holothuria squamata O. F. Muller, 1776. Zool. Dan. Prod., p. 232. 

 Psolus squamatus McAndrew & Barrett, 1857. Ann. Mag. Nat. Hist. (2) 

 Vol. 20, p. 45. 



A large Psolus, 88 mm. long, 45 mm. wide and 30 mm. high in its fully 

 contracted condition, seems to belong to this northern species. I have 

 compared it with specimens from Norway and cannot find any satisfactory 

 grounds on which to separate them. Nevertheless I shall not be surprised 

 if abundant material in good condition shows that the Californian Psolus 

 is specifically different from the North European species. 



Station 5695. Southwest of Santa Rosa Island, California, 534 fms. 

 Bottom Temp., 38.9°. 



Achlyonice ecalcarea. 



Theel, 1879. Bih. Kongl. Svenska Vet. Akad. Handl., Vol. 5, no. 19, p. 13. 



Although the specimens are in poor condition, it is possible to determine 

 their generic position, the number of tentacles being constantly 12 and the 

 arrangement of the pedicels and dorsal papilla? being determinable by 

 comparison of the different individuals. Although there are calcareous 

 rods present in the tentacles, I could find no calcareous ring nor any parti- 

 cles in the body-wall. I think therefore that their absence in Th eel's 

 specimens was not due to their dissolution in the alcohol. In any case 

 however, Theel's change of the name to paradoxa is of course inadmissible. 

 The best individual before me is only about 60 mm. long and is thus much 

 smaller than the 'Challenger' specimens. 



Station 5689. Off Rosario Bay, west coast of Lower California, 879 fms. 

 Five specimens. 



LsetmenoBCUS l gen. nov. 



Body elongated, more or less cylindrical. Lateral ventral ambulacra with rela- 

 tively few (15-20) large pedicels; mid-ventral ambulacrum possibly with a few similar 

 pedicels posteriorly. Dorsal ambulacra apparently without appendages. Tentacles 

 15. Calcareous particles in the body-wall, wheels and rods as in Laetmogone. 



Type-species. — Ixetmenacus scotoeides sp. nov. 



i XatT/ua = the deep sea + (volkos = an inhabitant. 



