1915.] 



NATURAL SCIENCES OF PHILADELPHIA. 



195 



Praticolella pachyloma (Mke.). Fig. 2. 



Helix -pachyloma Mke., Zeitsch. fiir Mai., IV, p. 32 (1847). 



This shell is globose, translucent corneous, with a white'lip and 

 very obscure microscopic spiral strise on the apex. The genitalia 

 (fig. 2) of a specimen. No. 104,75-1, A. N. S. Phila., from Seabrook, 

 Tex., collected by Mr. H. H. Wenzel, has a rather short, hollow, 

 finger-shaped, somewhat glandular appendix. The verge is long 



and much folded. The surface of the interior of the phallus and 

 the penial gland is granular and. without longitudinal plications. 

 The penis retractor has two subequal branches, one united to the 

 apex of the verge and the other attached at the base of the penial 

 gland. The vas deferens is long, folded and bound to the phallus 

 hj the branch of the retractor muscle at base of the appendix. The 

 spermatheca bulb is reniform. 



Praticolella mobiliana (Lea). Fig. 3. 



Helix mobiliana Lea, Proc. Amer. Phil. Soc, II, p. S2 (1841). 



It is usually smaller and more depressed than the preceding species, 

 and is translucent l^rown, with a deep groove back of the broadly 

 reflexed lip which often has a 

 reddish tinge. The apex has 

 very obscure microscopic spiral 

 strise. The genitalia (fig. 3) 

 of a specimen in the Acad- 

 emy's collection. No. 106,000, 

 from near Mobile, Ala., col- 

 lected by Mr. H. P. Loding, 

 has a conical penis with a 

 padlike penial gland on one- 

 side. The retractor muscle is attached to the apex of the penis. 

 The vas deferens is rather short. The thin-walled phallus and its 

 appendix are longitudinally corrugated within; the convex side of 

 the penial gland is glandular as in P. pachyloma Mke., but it is not 



