MUSEUM OF COMPARATIVE ZOOLOGY. 193 



well as of the basal part of the shell. And among the whole number I found not 

 one intermediate or doubtful specimen. There is no doubt but that we have to 

 consider them as being specifically distinct, the more so since they live together in 

 the same locality. For tlie new species I would propose the name P. HemphilU, in 

 honor of the man to whom we owe so many valuable additions to our malaco- 

 logical fauna. 



As in shape and general appearance the two species are almost alike, it may be 

 the best way to characterize the one in question by comparing it with P. calamitusu, 

 Pilsb. P. HemphilU averages a trifle larger than its companion, but either is some- 

 what variable in size. While calumitosa has a 

 minute perforation, HemphilU is umbilicated in 

 quite a peculiar way. There is a nodule-like pro- 

 jection on the umbilical part of the last whorl, 

 producing a rima beside the umbilicus ; in calam- 

 itosa there is nothing of this formation. On the 

 other hand, the latter has a small but distinct 

 groove-like impression just at the base, near the 

 aperture appearing as a slight projection inside. 

 This feature is wanting in HemphilU. Lamella : 



in the latter species, when looking from front, only one is generally seen in the 

 palatal wall, corresponding to the superior one in calamitosa, but longer ; i. e. be- 

 ginning deeper in the throat, and fairly seen on the outside ; also marked there by 

 a corresponding impression, ascending in a curve from near the base. A little dis- 

 tant from its inner end, just above the projection mentioned, there is another 

 lamella beginning, directed toward the base and ending there, also seen on the 

 outside. Quite generally there is a very small, thin, but well formed lamella in 

 the palatal wall, near the projecting auricle. The columellar fold is quite short 

 and small in HemphilU, yet consisting of a vertical and a horizontal part. The 

 (main) apertural lamella is decidedly longer in our species, and the supra- 

 apertural higher and entfre, while in calamitosa it is evidently composed of two 

 parts marked by an indentation in the middle, or even entirely separated, in quite 

 mature specimens. 



About twenty examples, collected at San Diego, Cal., by Mr. Hemphill, are all 

 P. HemphiUi, no calamitosa among them. They are little different from the San 

 Tomas River specimens, except by a somewhat shorter palatal lamella. 



The above is Sterki's description (The Nautilus, July, 1870, Vol. IV. p. 27). 

 My figure was drawn by him froiu the type. 



Pupa hordeacella, Pilsbkt. 



Plate II. Fig. 8. 



The shell is of a long-ovoid shape, smaller and slenderer than P. servilis, Gould, 

 translucent, waxen white, finely striate ; the aperture is roi.nded, with a thin, ex- 

 panded peristome. Within, there is, on the parietal wall, an entering fold arising 

 near the termination of the outer lip, its edge a trifle sinuous or nearly straight ; 

 the columella has a fold about in the middle. There is a tiny deep-seated fold on 

 VOL. XXII. — NO. 4. 13 



