133 



Length (after truncation) .175 inch ; breadth .06 inch ; 

 length of aperture .045 inch. 



Helicina nobilis. Shell depressed globose conic, thick and 

 solid : white beneath and at the end of the last whorl, other- 

 wise rufous or dark brownish red : very sn^iooth, the striae of 

 growth being very light; sometimes with a few very light 

 spiral striae : apex obtuse : spire convex conic : whorls nearly 

 four and one-half, subplanulate, with a rather deep suture 

 last whorl mucli depressed or even sinuate between the per- 

 iphery and suture at its termination : aperture compressed 

 above, expanded laterally : lip rather thick, moderately re- 

 flected along the middle only ; with a notch like that of H. 

 maxima Soiob. 



Mean divergence 130° ; greatest breadth .9 inch ; least 

 breadth .73 inch ; height .55 inch. 



This species differs from H. maxima in the flattening of 

 the whorls, which renders the spire conic ; in the compression 

 of the aperture from above, and the slight reflection of the lip ; 

 it is also more solid and less convex beneath. 



Helicina hirsuta. Shell depressed globose, rather thin : 

 brownish red, with an hirsute brown epidermis, having long 

 hairs in six spiral lines, of which one is next below the suture 

 and the others are on the middle and lower parts of the last 

 whorl : with the striae of growth lightly impressed : apex 

 rather obtuse, slightly mucronate : spire with the outlines 

 much curved : whorls nearly five, slightly planulate, with a 

 well impressed suture : aperture rather large, semi-elliptical ; 

 lip rather thin and sharp, but well reflected so as to form a 

 canal behind ; with the slit not very deep, but wide. 



Mean divergence 110° ; greatest breadth .59 inch ; least 

 breadth .48 inch ; height .04 inch. 



The slit has about the same proportions as in H. Hollandi, 



