144 SHELLS OF LOWER CALIFORNIA— STEARNS. 



Ill the specimen before me, wliicli resembles a large Flicafula, there 

 are from 19 to 20 of these ribs; these are sharply angiilated and inter- 

 lock closely at the margin of the valves. For an oyster this is a well 

 marked species; it suggests Hanley's Ofifrea megadon. 



Family Anomiid^. 



PLACUNANOMIA CUMINGII, Broderiir. 



One perfect example. 



Oft" Lower Cahfornia, at Station 2827; shelly bottom, in 10 fothcmis; 

 Albatross. 



Family SpondylidvE. 



SPONDYLUS PKINCEPS, BrodeiLp. 



Several examples, and odd valves. 



Pichiliuque Bay; also at Station 2828, oft" Lower California, in 10 

 fathoms; Albatross. The various colors exhibited by the shells of this 

 beautiful species are included in the collections at above places. 



Family P e c T k n i d ^ . 

 PECTEN SUBNODOSUS, S o w e r b y . 



Loreto; Scammon's Lagoon (No. 105025, U. S. IS". M.), Hemphill; 

 Carmen Island (Xo. 63647, TJ. S. X. M.), Towne. Examples of this iiiie, 

 though not very rare species, frequently occur, that are neither nodose 

 or subnodose. Hemphill found it living on mud flats. 



Pichilin(pie Bay (two odd valves). Albatross ; also at Station 2827 

 (No. 102091, U. S. N. M.) and Station 2826, 10 fathoms (No. 102088. 

 U. S. N. M.); in 9.^ fathoms, off Lower California. 



PECTEN VENTKICOSUS, S o w e r b y . 



Several examples. 



Pichiliuque Bay, one good specimen, beach; Sta. Margarita island 

 (one valve) ; Station 2828, 10 fathoms, off Lower California; nW Albatross. 



PECTEN (JANIRA) DENTATA, Soweiby. 



Several examples. 



San Juauico ; St. Luis Bay ; Guaymas, Palmer (No. 12508, U. S. N. M.), 

 Ballenas Bay (concave valve), and one good specimen at Station 

 2828, oft' Lower California, in 10 fathoms; Albatross. 



Family AvicuLiD^. 

 AVICULA PERUVIANA, Reeve. 

 One i)air valves; beach. Sta. Margarita Island. 



