322 WEST SOUTH AMERICAN SHELLS STEARNS. 



127. Monoceros tuberculatum Gray. 



-j- rur2>ura muricaia Gray. 



Specimens from each of the following places : 



Payta (2); Manta (2) ; Panama (1); Chatham Island, Galapagos. 



The horn in this species is sometimes barely discernible. A speci- 

 men of this kind probably led to the description of Piu-pura muricata 

 by tbe author. 



128. Monoceros brevidentatum Gray. 



Manta (1), beach; Panama (5). 



129. Cymia tectum Wood. 



^Cuma tectum Wood. 

 ^= C. anguUfera Duclos. 



Four examples. 



Manta. 



The specimens of this strongly marked form collected by Dr. Jones 

 vary in length from 1^ to 2:^ inches, and are very solid. Exterior col- 

 oration in some instances of a brownish purple or dull chocolate brown. 

 In one shell the lower is of a lighter color than the upper half. Speci- 

 mens in the collection collected by the late Thomas Bridges are of a 

 dull bufi" tint. This form is usually seen in collections under the nanu' 

 of Cuma, but Morch's name Cymia should be substituted for Cuma, 

 which properly belongs to a group of Crustacea. 



130. lanthina fragilis Lam. 

 = /. striatiila Cpr. 



One imperfect beach specimen. 



Chatham Island, Galapagos. d 



131. Triton olearium Liuu. 



Two examples, aduit. 



Manta ; Payta. 



Both specimens are somewhat beach worn. The larger is from I 

 Manta, and measures 5 inches in length. Not before credited to the 

 west coast of America. 



132. Triton Wiegmanni Auton. 



-.= Argohuccinum noiloffum Chemu. Aucf. 

 = 7'. Che7nnit:ii Gray. 



Beach shells, broken. 



Payta. 



Tryon m his "Manual of Conchology" properly attaches Anton'.s 

 name to this shell as it has several months priority over Gray's. It 

 has generally been distributed under the other names. Carpenter in his 



