ACADEMY OF SCIENCES. 



tend well over the periphery, and are not obsolescent as in the last species. 

 The interior of the aperture is -white; before the lips are thickened the brown 

 lines show through, and the prominent white threads of the throat iire dis- 

 tant from the outer edge. In this stage there is no siphonal fasciole. Later, 

 both lii^s may be strongly thickened; the threads (ten or fifteen in number) 

 nearly reach the edge, a labial callus and fasciole are formed. In ^adults 

 there are about twelve costiB on the last and ten on the sixth whorl. 



This species may reach two inches in length. A specimen perfect, but 

 with the lip still unlhickened, measures 1.85 in. lon;^; spire, 0.80 in.; aper- 

 ture, 0.6 in. (to posterior notch); canal, 0.5 in. The total is more than the 

 total length, not being measured on a median liuo. 



This beaiatiful sjjecies appears to be vei-y rare in a perfect condition, 

 though rolled specimens are common on Catalina Island (northern) beaches 

 and at San Pedro. The features of a young living specimen from Monterey 

 are obscured by the shaggy ei^idermis, of which beach specimens show no 

 trace whatever. In much thickened specimens there is a lump on the whorl 

 at the posterior angle of the aperture. It is perfectly distinct from the other 

 Califoruian species, and from any I find figured in the monographs. In a 

 general way it is perhaps a little like i^. ?<s<M/rti«s, Keeve, (Conch. Icon., PI. 

 XVII, f. GG.) It is named in honor of Dr. W. Kobelt, of Frankfurt on the 

 Main, who is engaged upon a monograph of the genus. 



There are several other species which approach California but not known 

 to be found within its borders, such as F. (Coins) DupetUhouarsi of Lower Cal- 

 ifornia, and Clirysodomus rectirosiris, Cpr., and liratus, Martyn from the Puget 

 Sound district. C. rectirostris singularly ''trough almost always has the long 

 and very slender canal crooked, by reason of repaired fractures. The adult is 

 covered with a peculiar olive green epidermis, somewhat like that of ;. fresh 

 water shell; the young are clear translucent whitish; elegantly sculptured and 

 bear little resemblance to the adult. The former have narrowly escaped de- 

 scription as new, by a prominent naturalist. All the fossil Tertiary species 

 which can be identified ha^ve been referred to, in order that this paper might 

 not uselessly add to synonymy. None, however, appear to be related to the 

 species here described. 



GA 



