232 RETUSA. 



Cyllchna obesiuscula Brugnone, Bull. Soc. Mai. Ital., Ill, p. 89, 

 pi. i, fig. 7, 1877. — Diaphana comdus Verrill, Proc. U. S. Nat. 

 Mas., Ill, p. 382, 1880; Trans. Conn. Acad., V, p. 543, pi. Iviii, fig. 

 25,1882; VI, p. 273, ISSi.—Retusa f obesiuscula Brugn., Dall, 

 Blake Gastr., p. 49. 



Pliocene of Messina, (Seguenza) ; of Palermo (Brugnone) ; U. S. 

 Fish Commission Stations 870, 949, 2595, 2602 and 2614, in 63-168 

 fms., living in about 100 fins. 



This species is quite distinct from Bulla conica or conulus of De- 

 shayes. Wood, Sars, etc., from C. hcernesi and C. ovata, with all of 

 which it has been confounded by various authors, especially Jeffreys. 

 Professor Verrill in referring to it noted the discrepancies. (Dall). 



R. OVATA Jeffreys. PI. 30, fig. 11. 



"Larger (than Cylichna umbilicata) narrower at the apex, and 

 conical ; the upper angle of the outer lip is higher and more pro- 

 jecting " (JeflTr.). 



Cylichna ovata Jeffreys, Rep. Brit. Assoc, 1870, Pore. Exp., p. 

 156 ; Ann. Mag. Nat. Hist., 5th ser., X, p. 34, 1882.— Watson, 

 Chall. Rep., p. 664, pi. xlix, fig. 9, 1885. — Utrieulus conulus G. O. 

 Sars, Moll. Reg. Arct. Norv., p. 287, pi. 17, fig. 17, 1878.— Cylichna 

 umbilicata var. conulus Jeffi'., Brit. Conch., IV, p. 414; V, p. 223. 

 Not Bulla conulus Deshayes, Cylichna conulus of Weinkauflf", or 

 Bulla conulus of Searles Wood. — Eetusa f ovata Dall, Blake 

 Gastr., p. 49. 



North Atlantic (Porcupine and Triton Expeditions); Bay of 

 Biscay (Travailleur Expedition) ; Azores (Josephine, Porcupine and 

 Challenger Expeditions); West Indies; off Pernambuco (Challen- 

 ger Expedition) ; Straits of Florida, 150-465 fms. (Dr. Rush) ; 

 Fast Coast of North America, 124-400 fms. (U. S. Fish Commis- 

 sion) ; range 100-1000 fms. over a muddy bottom in all parts of 

 the North Atlantic, with temperatures from 40° to 62° F. 



R. CiELATA Bush. PI. 23, fig. 69. 



Shell rather thick, opaque white, with a slightly lustrous surface 

 of moderate size, somewhat conical in shape, with a truncated tip 

 and an elongated tapering base. Spire concealed within a very 

 deep pit ; the two or three whorls are distinctly visible in an end 

 view and are crossed by numerous delicate, little curved riblets 

 which curve over the top of the body-whorl extending down a short 

 distance, and gradually blend with the flexuous lines of growth. 



