OF CONCHOLOGY. 253 



C. asmi, and none of the specimens alluded to approached the 

 latter in solidiiy, were as roundly conical, or were as smooth as 

 the typical asmi. Very perfect specimens of the latter show 

 under a sti'ong magnifier exceedingly fine, close grooves, which 

 are usually invisible to the naked eye, and are different from the 

 sculpture of either pelta or patina. Mr. Stearns found numbers 

 of specimens attached to Chlorostoma funebrale, and it has not 

 been found alive anywhere else. Its range, as far as known, is 

 from Sitka to Santa Barbara Island, and it is rare everywhere, 

 but perhaps most common at Monterey. 



COLLISELLA MITBLLA, Mke. sp. Plate 14, fig. 9. 



Ac7na>a mitella, Mke., Zeitschr. f. Mai. 1847, p. 187, No. 43. 

 Patella navicula, Rve., Conch. Ic. pi. 40, f. 130 a, b. 1854. 



The dentition of this species was obtained from a very small 

 dry specimen. Dr. Carpenter describes the shell, (Maz. Cat. 

 p. 210). It has, as far as I am able to discover, been reported 

 only from Mazatlan and the Gulf of California. 



COLLISELLA STRIGATELLA, Cpr. Sp. Plate 14, fig. 5. 



Acmcea strigatella, Cpr., Ann. and Mag. N. Hist. 3d ser. xiii, 



1864, p. 474. 

 A. strigillata, Cpr., Sup. Rep. 1863, p. 618, No. 17. 



The dentition of this species was also Avorked out from a small 

 dry specimen, which afforded no details in regard to the- animal. 

 It is reported from Cape St. Lucas, where it was collected by 

 Xantus. 



COLLISELLA FASCICULARIS, Mke. sp. Plate 14, fig. 11. 



Acmcea fascicularis, Mke., Zeitschr. f. Mai. 1851, p. 38, No. 



134. 

 Patella oj?ea, Rve., -}- A. mutabilis, Mke. (pars). 



A similar remark will apply to this species. It has been ob- 

 tained from Cape St. Lucas, Margarita Bay, Mazatlan, and the 

 Gulf of California generally. In this species and 0. mitella the 

 specimens from which the teeth were obtained were so very mi- 

 nute that the accessory uncinus could not be clearly made out, 

 and hence is omitted in the figure. An examination of the adult 

 radula would doubtless disclose them, as in the allied species. 



CoLLISELLA PALEACEA, Gld. Sp. 



Acmcea paleacea, Gld., Mex. and Cal. Shells, p. 3, pi. 14, fig. 



5. Cpr., P. Z. S. 1856, No, 40. 

 Some specimens of the animal of this species, which I owe to 



