3GG CALIFORNIA AlADEMV OF SCIENCES. 



EXPLANATION OF PL.A.TE II. 



(all figures magnified.) 



TiirboniUa ( Lancea) tridentata Carpenter. Longitude 12.8 mm.; X5. 273 



Same Nuclear whorls more enlarged. 273 

 Tiirbonilla (Pyrgiscus) subciispidata Carpenter. Type specimen. Longitude 



6 mm.; xg. 277 

 Same. Nuclear whorls more enlarged. 277 

 Tiirbonilla ( Pyrgolampros) lowei var. pedroana Dall & Bartsch. Type speci- 

 men. Longitude 5.5 mm.; xio. 279 

 Same. Nuclear whorls more enlarged. 279 

 Tiirbonilla torquata Gould. Longitude 10.6 mm.; x6. 271 

 Same. Nuclear whorls more enlarged. 271 

 Tiirbonilla stearnsii Dall & Bartsch. Type specimen. Longitude 9.2 mm.; 



X6.7. 271 



Same. Nuclear whorls more enlarged. 271 



Tiirbonilla ( Pyrgiscus) crebrifilata Carpe.vter. Longitude 5.4 mm.; X10.7. 276 



Same. Nuclear whorls more enlarged. 276 



Tiirbonilla (Pyrgiscus) tenuiciila Gould. Longitude 6.1 mm.; xg." 275 



Same. Nuclear whorls more enlarged. 275 



Tiirbonilla ( Pyr^iscultis) laminala Carpenter. Longitude 6.8 mm.; xg. 277 



Same. Nuclear whorls more enlarged. 277 



