46 PALAEONTOLOGY OF CALIFORNIA. 



size. Aperture broad, subovate, acute behind, narrowing regu 

 larly in front ; canal short, and slightly deflected ; outer lip striate 

 internally; inner lip rather heavily incrusted. Umbilicus well 

 marked but closed. 



Length about 5 inches. A specimen, with all of the body whorl, but having lost 

 the spire, measures, from suture to end of canal, 3. 5 inch, width of body 2.4 inch, 

 length of aperture 2.7 inch. A smaller specimen shows that the total length of the 

 shell is about twice the length of the mouth. 



From the Pliocene of San Fernando, near Wiley's, on the San Fernando Pass, 

 Los Angeles County. 



A well characterized species, having no close relatives among the known fossil 

 or recent forms of this region. 



AGASOMA, Gabb. N. Gen. 



Subfusiform, spire low, body whorl long; canal moderately 

 produced and slightly deflected; aperture elongate, labrum simple, 

 labium incrusted with a thin smooth plate ; suture bordered as in 



Clavella. 



This genus resembles Clavella^ Swainson, in its general form, and in the border 

 ing of the suture by an elevated portion of the succeeding whorl. It differs, how 

 ever, in the very short spire and in the short and slightly curved canal. It is 

 proposed to receive two species from the California Miocene, both of which, unlike 

 the typical Clavellas, are ornamented by revolving ribs and by tubercles. 



A. GRAVIDA, G. 

 (Clavella gravida, Gabb, Pal. Cal., Vol. 2, p. 4, pi. 1, fig. 6.) 



The figure quoted above, does not exhibit all of the characters of the pillar lip. 

 In all the specimens I then had, this part was covered by matrix which I was 

 unable to remove. Further specimens show that it is curved, though to a less ex 

 tent than that of A. sinuata figured on the same plate. 



A. SINUATA, G. 

 (Clavella sinuata, Gabb, Pal. Cal., Vol. 2, p. 6, pi. 1, fig. 7.) 



A rare shell, only found in the lower portion of the Miocene, associated with 

 Mulinea densaia, Ostrea T*itan, &c. 



