128 THE NAUTILUS. 



rounded; thin, translucent, light horn color; lines of growth very 

 fine and regular ; apex radially striate, obtuse, not prominent, not 

 elevated above the anterior slope, situated at about the posterior 

 third of the length and distinctly turned to the right ; anterior slope 

 slightly, but rather evenly curved from the apex, but becoming 

 nearly straight towards the anterior margin ; posterior slope nearly 

 straight, being but slightly incurved ; lateral slopes oblique, the left 

 quite convex, the right nearly straight, slightly incurved beneath the 

 apex. 



Length 3.25, width 2.25, alt. 1 mm. 



Type locality, Canal Mahmoudich, Alexandria, Egypt. 



Type in the collection of Paul Pallary. Cotype, Coll. Walker. 



Although only one mature and two immature examples are befort, 

 me, this species is so entirely different from the other species of the 

 Nile that I do not hesitate to describe it. Its broad-oval outline, 

 more oblique lateral slopes and the position and shape of the apex 

 are characteristic and quite unlike any of the described species from 

 that region. 



Named in honor of M. Paul Pallary, who has done much to eluci- 

 date the fauna of Northern Africa. 



GUNDLACHIA I/HOTELLERIEI (" Bourguignat ") n. Sp. PI. VII, 



figs. 15-21. 



Ancylus clessini Pallary, Mem. Inst. Egypt., VI, p. 59. 



Shell very small. The non-septate form (figs. 15-19) is subde- 

 pressed, narrowly ovate, being wider anteriorily, mostly on the left 

 margin, the right being nearly straight in the median portion and 

 and about equally curved at both ends ; anterior and posterior margins 

 regularly rounded ; thin, translucent, light horn color ; lines of growth 

 fine and regular, anterior slope somewhat radially wrinkled ; apex 

 prominent, very obtuse, radially striate and turned towards the right, 

 situated at the posterior ^of the length; anterior slope long, decidedly 

 and regularly convex ; the posterior slope short and straight, but 

 slightly oblique, from the base of the protuberant apex ; left slope 

 very convex above, thence descending in a nearly straight, oblique 

 line to the margin ; right slope less oblique and nearly straight, be- 

 ing very slightly concave below the swell of the apex. 



Length 2.75, width 1.5, alt. 1 mm. 



The septate form (figs. 20-21) is smaller than the non-septate and 



