538 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
Pterocrinus P. H. Carrenver, 1884. 
1884. P. H. Carpenter, Challenger Reports, XI, Zoolons pp. 
949, 248. 
Type.—Bathycrimus australis A. A. Clark, 1907. 
atepov =a feather+ «pivov=lily. 
No generic diagnosis is given with this name; it was found in 
Sir Wyville Thomson’s handwriting on a bottle containing speci- 
mens of the species given as the type. We have, therefore, a 
definite generic name, with a definite type, so the genus must be 
accepted if it should ever become necessary to separate Bathy- 
crinus gracilis and Bathycrinus australis generically. The case 
is exactly parallel to that of Dajfilula Coues, where the generic 
name only was given with the type Querquedula eatoni. 
Ptilocrinus A. H. Criarn, 1907. 
1907. A. Hl. CuarK, Proc. U. S. Nat. Mus., X XOXTD, p. 551. 
Type.—Ptilocrinus pinnatus Ne H. Clark (n. sp.). 
atiiov =feather+ Kpivoyv=lily. 
Ptilocrinus pinnatus A. H. Crark, 1907. 
1907. Ay El. Crark, Proc: U.S: Nat. Mus; SOO py doll, pl: 
Li, fig. p. 552. 
Type-locality.—b2° 39’ 30” north latitude, 130° 38’ 00’’ west 
longitude (Queen Charlotte Islands, British Columbia) ; 
1,588 fathoms. U.S. 8. Albatross. 
pinnatus= feathered. U.S. National Museum. 
Ptilometra A. H. Cuark, 1907. 
1907. A. H. Crarx, Smiths. Miscell. Coll. (Quarterly Issue), 
L, pp. 3847, 358. 
Type.—Comatula macronema J. Miiller, 1846. 
mtihov=feather+ metra. 
Rhizocrinus M. Sars, 1864. 
1864. M. Sars, Forhandl. Vidensk. Selsk., p. 127. 
Type.—Rhizocrinus lofotensis M. Sars (n. sp.). 
pila=root+«pivory=lily. 
Rhizocrinus chuni Dopervern, 1907. 
1907. Dopnertern, Die gestielten Crinoiden der Siboga-expedi- 
tion, p. 14, pli m, fig. 5; pl. vi, fie. 6; fie. 6, p. 14: 
Type-locality—Off Somaliland, East Africa; 1644 and 1668 
meters. German 8. 8. Valdivia. 
Professor Karl Chun. 
Rhizocrinus lofotensis M. Sars, 1864. 
1864. M. Sars, Forhandl. Vidensk. Selsk., 1864, p. 127. 
