lowe;r californian moi.lusca. 339 



duced to 8 or 9, the 7th largest. 6th and 8th about equal 

 and much smaller, penultimate not narrowed and larger 

 than fourth. Outline swollen at middle, contracted at 

 suture of body-whorl, which is shorter vertically than in 

 C . 7'amcntosa. Mouth subcircular, subacutely pointed 

 at its apex, near suture, the constrictions on body-whorl 

 deep, partly visible inside, otherwise as in rameniosa. A 

 very thin brownish epidermis covered the living shell. 



Length 0.85, breadth 0.19 inch; mouth 0.22 long, 0.18 

 wide. 



Five found on higher part of the range of C . ranicutosa 

 bv Dr. Eisen. 



This might well be considered a distinct species if 

 there were not some indications of intermediate charac- 

 ters, and until more are known we may attribute the 

 variations to environment, local influences producing a 

 stunted race. 



Melaniella? eiseniana n. sp. Plate xiii, fig. 3. 



Shell sinistral, with a thin brownish epidermis, first two 

 nuclear whorls white, smooth, turbinate, third narrower, 

 and with the rest covered with numerous vertical riblets, 

 increasing to about 50 on body-whorl, where they curve 

 round the base and end at the edge of lip. Whorls 17 

 to 19 regularl}^ and slowly enlarging from the 3d to the 

 bod3^-whorl, which is contracted about one-third, flat- 

 tened, sutures moderately impressed, truncating the rib- 

 lets. Penultimate whorl swollen, largest, narrow^ing to- 

 ward mouth, which is ovate, acute at junction of lips, of 

 which the outer crosses the inner, ending at the sutuse. 



Length about 0.55 inch, breadth o. 14 ; mouth 0.08 long, 

 0.09 wide. Shell transparent. 



Fourteen found by Dr. Eisen under stones living, but 

 the epidermis being destroyed by alcohol they do not have 

 exactly the color of fresh ones. 



