46 PYRAMJDULA. 



p. 8. Patularia CLESSIN, Die Molluskenfauna Oesterreich-Ungarns 

 und der Schweiz, p. 104 (proposed for P. rotundata, hauffeni, ruderata, 

 solar ia,pygmcea). Spelceodiscus BRUSINA. Mittheil, naturwissensch. 

 Ver. Steierruark, 1885, p. 37, type, H. hauffeni. Allerya BOUR- 

 GUIGNAT, Atti Ac. Palermo, 1876 (^embryonic shells of H. rotund- 

 ata, etc.). 



Shell rather small, depressed, with low but convex spire and open 

 umbilicus. Apical H whorls smooth, the rest obliquely rib-striate, 

 rather tubular, rounded or keeled at the periphery, unicolored or 

 flamed with reddish. Aperture wide-lunate, the lip simple. Type 

 P. solaria Mke., pi. 10, fig. 14. See also pi. 10, figs. 12, 13, P. 

 rotundata Mull. 



Animal (of P. perspectives Say) long and narrow, the foot white, 

 head and back dusky blue. Sole equal in length to the diam- 

 eter of the shell, undivided (having a central longitudinal sulcus 

 when entering the shell or in alcohol); margins of foot having a 

 wide border, bounded by a distinct groove, the grooves meeting 

 above the tail. Upper surface coarsely granulated. Eye pedun- 

 cles long and slender, from one-third to one-half as long as the foot 

 (pi. 14, fig. 45). 



Genital system lacking all accessory organs. The penis is short, 

 having the retractor and the vas deferens inserted at its apex. 

 Spermatheca small, situated upon a very long simple duct, which 

 enters the vagina very low. At the base of the albumen gland 

 there is a rather large talon. The albumen gland is small and 

 adherent to the lower part of the hermaphrodite duct ; the latter 

 being large and very much convoluted (pi. 11, fig. 22, P. persjiec- 

 tiva). 



The genital system of P. rotundata as figured by Lehmann is sim- 

 ilar. Leidy's figure of that of perspectiva is incorrect in showing 

 an appendicula. 



Jaw arcuate, with a slight median projection, finely striated, 

 the striae subvertical, diverging below toward the outer basal 

 angles of the jaw (pi. 11, fig. 19, P. perspectiva). The jaw of 

 rotundata, according to Lehmann and Moquin-Tandon, has fewer, 

 more spaced striae than I have found in P. perspectiva. That of P. 

 balmei (pi. 15, fig. 2) is very distinctly and closely striated, and dif- 

 fers from the jaw of perspectiva is being incompletely soldered, the 

 edges of the component vertical plates being slightly free, as in some 

 charopoid snails. 



