146 SHELLS OF LOWER CALIFORNIA— STEAENS. 



tross (No. 102104, U. S. N. M.). The specimen was attached to a Pla- 

 cunonomia valve. 



MODIOLA CAPAX, C out- ad. 



One example. 



La Paz, Forrer. Sta. Margarita Island (fragment), Albatross. 



The late J. A. McNeil, so well known for the archaeological material 

 collected by him in Chiriqui, etc., obtained the above species in the 

 Bay of Fonseca. 



MODIOLA 15RAZILIENSIS, Chemuitz. 



Two examples. 



La Paz, Forrer (No. 63706, U^ S. N. M.); Hemphill has carried the 

 distribution much ftirther to the north, having collected it in San Igna- 

 cio Lagoon (No. 105601, U. S. N. M.). Dr. Edward Palmer found it quite 

 abundant near Guaymas, aud the late J. A, McNeil obtained beautiful 

 clean examples at the more southerly locality of the Bay of Fonseca 

 (No. 63705, U. S. N. M.). It is a well nmrked species. 



LITHOPHAGUS ? ARISTATUS, S o 1 n n d e r . 



Two examples. 



Burrowing in Spondylus princeps^ Statiou 2828, 10 fathoms off Lower 

 California, also fragments Sta. Margarita Island; Albatross. 



Family A r c i d yE. 



ARCA PACIFICA, Sowerby. 



One specimen. San Juanico. 



ARCA (SCAPHARCA) LABIATA, H o w e r b y . 



Several specimens. Animas Bay (No. 41604, U. S. N. M.). 



This pretty species is represented in the Fisher collection by numer- 

 ous examples, all fresh and perfect; its geographical range extends 

 from Peru to the above locality, the most northerly thus far reported. 

 Gabb collected it at Loreto (No. 74836, U. S. N. M.), and Bridges 

 detected it at San Juan del Sur, in Nicaragua (No. 74837, U. S. 

 N. M.). 



ARCA (SCAPHARCA) TUBERCULOSA, Sowerby. 



Two specimens. Magdalena Bay (No. 74813, U. S. N. M.) ; San Juan- 

 ico, Gabb; Guaymas, E. Palmer (No. 23617, U. S. N. M.). 



ARCA (SCAPHARCA) MULTICOSTATA, Sowerby. 



Numerous examples. 



Scammon's Lagoon on mud flats (No. 105596, U. S. N. M.), Hemphill; 



