''^IsgL^'J PROCEEDINGS OF THE NATIONAL MUSEUM. 333 



198. Fissurella rugosa Sby. 



Nine specimens. 



Payta. 



Carpenter's comments (Mazatlan list) upon the variability of this 

 species rest on his examination of " thousands of specimens." As 

 many as a thousand have been examined by me at various times, and I 

 can add my testimony as corroborative of Carpenter's. 



Mr. Pilsbry has recently described F. mbroxncta from Lagoon Head, 

 mainland of Lower California, opposite Cedros or Cerros Island. His 

 specimens were collected by Mr. Hemphill, and the National Mnseum 

 was kindly presented with three of the same lot. They are much 

 heavier and more elevated than any specimens of rvgosa-onacrotrenia 

 in the National collection, and on the whole not as elongated, but never- 

 theless appear to be quite closely related. The crimson stain that sug- 

 gested the name rubropicta is not unusual in either rugosa or macro- 

 trema. The Museum series of rtigosa, etc., includes a large number of 

 selected specimens, over a hundred, and one-quarter as many of macro- 

 trema, so called, from various localities on the West Coast. 



199. Fissvxrella virescens Sby. 



Several examples. 



Payta; Manta ; Panama; Chatham Island, Galapagos group. 



At Payta it appears to be abundant; Manta, two examples, beach; 

 Panama, one fresh; and five rather small specimens from the Gala- 

 pagos. 



The late Thomas Bridges collected a large number of the above and 

 the following at San Juan del Sur, Nicaragua ; also in Panama Bay 

 and elsewhere on the west coa.st of Central America. 



200. Fissurella nigropuuctata Sby. 



z= F. virescens Sby., variety. 

 One specimen. 



Panama. 



Mr. Pilsbry in his "Manual" makes nigroimnctata a variety of vires- 

 cens^ a conclusion that is unavoidable after a careful examination of a 

 large series. The same author intimates other dift'erences than color, 

 but these are not obvious ; the ample series before me show that the 

 color spots are all there is upon which a varietal distinction can rest. 



201. Fissurella peruviana Lam. 

 := F. occidens Gld. 



Seventeen specimens, in various conditions. 

 Pacasmayo. 



202. Fissurella maxima Sby. 



A single large, heavy example, nearly 4 inches in length. 

 Manta. 



