MUSEUM OF COMPARATIVE ZOOLOGY. 219 



Pupa calamitosa, Pilsbrt. 



Shell minute, cylindrical, very blunt at apex, chestnut-colored ; whorls 4^, the 

 first one and a half smooth, the following regularly costulate striate, the costulae 

 separated by spaces wider than themselves ; last whorl abruptly turning forward, 

 rounded beneath, encircled by a slight central constriction or furrow ; aperture 

 about one third the total length of shell, rounded, truncated above, contracted 

 within; peristome thin, expanded, without crest or callous thickening behind; 

 columellar margin rather dilated ; parietal wall bearing two entering lamella?, one 

 arising near the termination of the outer lip, the other more deep seated, elevated, 

 entering less obliquely ; columella with a strong white deep-seated obliquely enter- 

 ing fold ; outer lip with two short white lamellae. 



Alt. 1.70, diam. 0.80 mm. 



Two trays of this. tiny species are before me. One received from Henry Hemp- 

 hill, collected near the mouth of San Tomas River, Lower California, the other 

 collected by Orcutt near San Diego, California. Most specimens show the widen- 

 ing inward of the outer lip shown in the figure. Several specimens have only one 

 lamella on the outer lip, and are rather larger than the typical form described, 

 measuring 1.90 mm. alt. The second parietal lamella is usually much larger than 

 the first, but in one or two specimens before me this is not the case. The umbili- 

 cal rimation terminates in a tiny depression, perhaps minutely perforated at the 

 axis. The formula of denticles or folds (according to Dr. Sterki's scheme 1 ) 

 AA B D E or AA B E. The species is of a decidedly different type from any 

 known American Pupa. P. hordacea, Californtca, and Rowelli, abundant Western 

 forms, belong in quite diverse groups ; the first being allied to P. corticaria and 

 pellucida, the last two grouping with P. decora, Rowelli, and corpulenta. 



From the Pupa, of the Mexican fauna, leucodon, pellucida, and chordata, the pres- 

 ent species is quite distinct in every respect. 



The inward continuation of the parietal and columellar folds is shown in Figure 

 17. They are white, regularly veined with darker, like polished plates of agate. 



From Proc. Acad. Nat. Sci. Phila., 1889, p. 411, Plate XII. Figs. 16, 17. 



Mr. Hemphill sends me the following descriptions, which must be fully 

 credited to him ; — 



Helix tudiculata, var. Binneyi. 



This beautiful variety belongs to the globosely depressed forms of H. tudicu- 

 lata, Binn. It is of a uniform greenish yellow color, without blotches or 

 markings, except a very faint trace of a band at the periphery. H. tudiculata 

 is very variable in form, size, and sculpture, and with the umbilicus either 

 open or closed, but it is very constant in its dark chestnut-color in Southern 

 California. North of Merced County, however, it becomes a shade lighter, 

 and passes towards the light, thin form of H. arrosa, which I regard as the 



1 See Proc. U. S. Nat. Mus., 1888, p. 369. I have repeated the letter presenting 

 the parietal fold, as the two seem to be of equal importance. 



