328 WEST SOUTH AMERICAN SHELLS — STEAKNS. 



170. Crepidula Lessoni Brod. 



One at each place. 



171. Crepidula excavata Brod 



Bahia; Payta. 



Four specimens. 

 Payta. 



172. Trochatella radians Lam. 



= Trochita radians Laiu., Aiict. 

 ^ Infundihuhnn radians Orb. 

 " = Infundihulum radians Mont., Tryon. • 



Beach shells. 



Bahia. 



Tlie generic name Trochita, which is in general nse for this form, must 

 yield to Trochatella of Lesson, as adopted by Fischer in his Manuel do 

 Conchyliologie, 1887. Schumacher's genus Trochita rests upon the Chi- 

 nese form, Galerus chinensis Lam. (Adam's Genera), a shell that is ex- 

 ternally white or whitish and smooth under a fibrous epidermis and the 

 type of Lamarck's genus Calyptrma. Trjon's use of Moutfort's name 

 Infundihulum in Vol. viii of his Manual on page 121, no doubt arose from 

 his confounding it with Orbigny's Infundihulum. Montfort's includes a 

 group of the top shells Trochidce, and is so used and properly by Mr. Pils- 

 bry in his continuation of Tryon's work in Vol. xi, pp. 7-24, and Orbig- 

 ny's is a synonym of Lesson's Trochatella, which rests upon a variety of 

 this West Coast form and has precedence over Orbigny's by six years. 

 Orbigny's name is barred in any event by the priority of Montfort's. 



The generic term of Trochatella was subsequently used by Swainson 

 for a section or group of the Belicinidce, and is therefore a synonym ; 

 in place of it Fischer has given the name Eutrochatella. 



For reference to Schumacher in connection with the above, see his 

 Nouv. Syst. etc., p. 184, Copenhagen, 1817; and for Lesson's, see his 

 " Voyage de la Coquille," etc. 



173. Hipponyx autiquatus Linu. 



One example from each. 



Payta; Chatham Island, Galapagos. 



174. Hipponyx barbatus Sby. 



Three specimens. 



Manta; Galapagos Islands. 



175. Natica (Polinices) uber Val. 



Payta (numerous); Manta (two examples) ; Panama, nine specimens. 

 "Ten to twenty feet above high-water mark" [W. H. J.]. 



