320 WEST SOUTH AMERICAN SHELLS STEARNS. 



112. Trophon peruvianus Lesson. 

 = J'urpura xanihostoma Brod. 



Oue junior, beacli. 

 Payta. 



A variable form. Not uncommon in a fossil condition in certain 

 places along the South American coast. 



113. Vitulaiia salebrosa King. 



One specimen. 



Panama. 



114. Purpura undata Lam 



(Rve, Couch. Icon., Mon. Purp., tig. 43.) 



Four beach shells. 

 Payta. 



115. Purpura diadenia Rve. 



Numerous exami)les. 



These shells agree with Reeve's figure and description. They are 

 very close to P. imdata Lam. and to P. Blainvillci Desh. 

 Payta. 



116. Purpura Blainvillei Desh. 



Several specimens. 

 Payta; Pacasmayo. 



117. Purpura biserialis Blainv. 



A common form. 



Manta; Panama. 



The relationship, analogy, and synonomy of the form or forms which 

 Carpenter in his Mazatlan shells has included under the specific name 

 of biserialis, I do not propose to discuss in this catalogue. To properly 

 indicate the characters, variation, etc., of this protean species intelli- 

 giblj', would require several figures and elaborate and extended diag- 

 noses. 



118. Purpura callaoensis Gray. 



Fourteen beach specimens. 

 Payta. 



119. Purpura triangularis Blainv. 

 =P. Carolensis Rve. 



One specimen. 

 Payta. 



120. Purpura melo Duclos. 



Numerous specimens on the beaches, fresh or dead. 



Payta; Panama, and Panama Bay on Dead Man's Island; Manta; 

 Chatham Island, Galapagos. 



One specimen from Manta was 2^ inches long, with an unusually 

 elevated spire. 



