OF CONCnOLOGY. 49 



The whole number (^ivon by Mc Andrew in Brit. Assoc. Report 

 for 185G, as found by him at "south of Spain and Mediterranean 

 Sea," was only 4'i5, which, considering the great extent of the 

 latter sea, reaching south to lat. 32°, makes it probable that the 

 species near Cadiz, though so much longer investigated, do not 

 number more than are known at Monterey. 



About GOO species are known in all California between lat. 

 82° and 42°, including land and fresh water, (which are not re- 

 presented at Monterey by more than ten species.) As may be 

 supposed, from the peculiar conditions combined at Monterey, 

 many species rare there are numerous in other localities, and in- 

 deed many are only found there dead, having been washed away 

 from the places where they lived. 



In the following list I have given the results of my collecting 

 at Monterey and Santa Cruz, marking only those species with 

 an * that were first obtained by me, though many others were un- 

 described at the time I collected them, and some of these were 

 even received by Carpenter later than mine, from the naturalists- 

 of the N. W. Boundary Survey. Still, as they Avere collecting for 

 some years before I commenced, they are entitled to priority of 

 discovery even in doubtful cases. The name of discoverer at 

 Monterey is given when known. 



Several of the Santa Cruz additions were discovered first by 

 me at other places and are marked with af. Many others, which 

 I discovered at more southern localities, have since been found at 

 Monterey, but I do not include them here. I include 7 southern 

 species dredged in Carmel Bay, but not yet discovered north of 

 Point Pinos. The collection was made for the State Geological 

 Survey of California, under direction of Prof. J. D. Whitney. 

 The remarks given are usually the result of observations made 

 since 18G1. 



Catalogue of Collections. 



The original number is given first; then tlie Geographical Catalogue 

 number. 



349 3 Terehratula unguiculus, Cpr. 



Str. Fuca to San Diego, near 1. w. to 20 fms. 

 12 dead, 20 fms., shell sand. Lives just below tides. 

 401 6 Waldheimia Grayi, Dav. 



New Year Point to Catalina I. — Japan. 

 2 dead, 20 fms., shell sand. Santa Cruz, bch., valves, rare. 

 927 12 Xylotrya setacea, Tryon. 



S. F. Bay (to San Pedro ?). 

 Santa Cruz, common. In timber submerged. 

 4 



