154 BULLETIN 150. UNITED STATES NATIONAL MUSEUM 



unnotched; the rays increasing gradually in length. Body slightly 

 brownish; peritoneum pale. 



Genus ELASSODISCUS Gilbert and Burke 



Elassodiscus Gilbert and Burke, 1912a, p. 81. 



Disk not perfect, reduced to a rudiment, the rays absent; nostril 

 single; teeth trilobed; suprabranchial pore single; pyloric coeca 

 present; pseudobranchiae absent; branchiostegal rays 6. 



Genotype. — Elassodiscus treinehundus. 



ELASSODISCUS TKEMEBUNDUS Gilbert and Burke 



Elassodiscus tremebundns Gilbert and Burke, 19120, p. 81. 



Tijpe.—No. 74388, U.S.N.M.; Albatross Station 4797, off Starits- 

 chkof Island, Kamchatka; depth 682 fathoms. Length 214 mm. 



Distrihution. — Southeast coast of Kamchatka; Albatross Station 

 4797; depth 682 fathoms. Numerous specimens examined. 



Figure 80.— Elassodiscus tremebundus. Type 



Synopsis. — Dorsal 65; anal 60; pectoral 32; caudal 8; pyloric 

 coeca 16. Depth 4.4 in length without caudal; head 3.6. Eye 5.5 

 in head. Body moderately elongate, deep and much compressed. 

 Teeth stout, trilobed. Gill slit above the pectoral fin. One supra- 

 branchial pore present. Disk rudimentary. Body pale; lips and 

 gill cavity dusky; caudal and the marginal half of the dorsal and 

 anal posteriorly black; peritoneum and stomach black. In life 

 translucent, reddish. Specimens numerous, reaching a length of 



214 mm. or more. 



Genus PARALIPARIS Collett 



ParoKpam CoLLETT, 1878, Chra. Vid. Selsk: Forh., 1878, No. 14, p. 32, (bathybii). 



Amitra Goode, 1880, Proc. U. S. Nat. Mus., vol. 3, (liparina). 



Monomitra Goode, 1883, Proc. U. S. Nat. Mus., {Uparina}?. 



Hilgendorfia Goode and Bean, 1895, Special Bull. U. S. Nat. Mus., No. 2., 



{membranaceus) . 

 Amitrichthys Jordan and Evermann, 1896, Rep. U. S. Fish Comm., 1895, p. 453, 



(cephalus). 

 Hilgendorfia Jordan and Evermann, 1896, Rep. U. S. Fish Comm., 1895, p. 453; 



1898, Bull. U. S. Nat. Mus., No., 47, (ulochir). 



