2741 
1074 
3164 
2466 
1068 
1069 
1333 
363 
364 
100 
362 
1070 
1435 
1256 
1257 
2742 
563 
2082 
529 
217 
2672 
2673 
2674 
2675 
2964 
2965 
2966 
2967 
2968 
2969 
2970 
2971 
2659 
2660 
2253 
2042 
2482 
2484 
2485 
2486 
2487 
2488 
2421 
2381 
2661 
2662 
2663 
2664 
2665 
2666 
2667 
2668 
2669 
2670 
1184 
1183 
1689 
2535 
41 
Siphonaria vernalis 
Siphonaria thersites Carpenter. 
Siphonaria zequilirata Cpr., 1867. 
Sistrum carbonarium Sby. 
Skenea planorbis Fabricius. 
Solariella perambilis Carpenter. 
Solecardia eburnea Conrad. 
Solecurtus californianus Conrad 
Variety Subteres Conrad 
Solen rosaceus 
Solen sicarius Gould 
Styliferina turrita Carpenter. 
Solariella carlotta Dall. 
Solariella cidaris Cpr. 
Solariella varicosa Mighels and Adams. 
Solariella unda 
Solariella oxybasis Dall. Off S. Barbara Isl., in 414 fms. 
Solariella triphostephanus 
Solemya johnsoni Dall. 
Solecurtus californianus Conr 
Solemya panamensis Dall. 
Solemya valvulus Cpr. 
Solemya Agassizii Dall. 
Solemya ventricosa Conr. 
Sonorella virilis 
Variety circumstriata 
Variety Huachucana 
S: Hachitana Ashmuni 
Variey Bowiensis. Bowie, Arizona. 
Variety Rowelli. (Helix Rowelli Newc.) 
S: Granulatissima parva. Arizona. 
Variety Latior 
Sonorella Indioensis 
Sonorella coloradoensis 
Sonorella argus 
Sonorella granulatissima 
Sonorella Lohrii lioderma 
Sonorella Ashmuni 
Sonorella Dalli 
Sonorella Baileyi 
Variety Orcutti Bartsch. 
Sonorella Fisheri Bartsch, 1. c. 
Sonorella walcottiana 
Sonorella betheli 
Sonorella Hachitana 
Sonorella Nelsoni 
Sonorella Goldmani 
Sonorella Merrilli 
Sonorella Mearnsi 
Sonorella Magdalenensis 
Sonorella Lohrii 
Variety lioderma Pilsbry. 
Sonorella Arizonensis 
Sonorella Rowelli 
Spheenia californica Conr. 
Sphzenia ovoidea Carpenter. 
Sphzerium dentatum Hald. 
Sphzrium Hendersoni 
