34 BULLETIN 181, UNITED STATEiSi NATIONAL MUSEUM 



The foot is short, oval, with undivided sole. The snout is of 

 medium length, tapering, conical, truncate at the tip. The tentacles 

 are short, slightly tapering, but blunt at their tips. The eyes are 

 small, borne on slight prominences at the outer base of the tentacles. 



The verge is conspicuous in male individuals. It is attached on the 

 side of the neck, lateral to the right tentacle, and furnished only 

 with a seminal groove. The verge is basally somewhat flattened, and 

 a little swollen in appearance, gradually tapered to a subcylindrical 

 glandular portion near the tip. The seminal groove begins at the 

 opening of the vas deferens and extends diagonally across the body 

 surface to the posterior basal point of attacliment of the verge, and 

 continues on the under or posterior side of the verge, to the narrowly 

 rounded tip. Ordinarily the terminal part of the verge is looped 

 or folded upon itself, along the side of the foot. 



The jaw is composed of two triangular pieces hinged together 

 dorsally. The median edge of each jaw is thickened into an obscure 

 ridge which projects as a distinct cutting point, on the free edge of 

 the jaw. The surface of the jaw is marked with diagonal striations 

 (or rows of diamond-shaped scalelike elements) ; running nearly for- 

 ward at the median line, these extend over the ridge, where they 

 gradually change direction, to extend diagonally to the cutting edge. 



The radula has the characteristic formula of the family Cyclo- 

 phoridae. The central is tricuspid, much higher than wide. The 

 lateral is tricuspid, oblique, the central cusp much larger than the 

 other two. The inner marginal is somewhat oblique, and bears three 

 cusps, the middle one twice as long as the two smaller ones. The 

 shorter, outer marginal tooth bears only two subequal cusps on its 

 cutting edge. 



The reduction of cusps to two on the outer marginal tooth appears 

 to be characteristic of the genus Farcirrien. 



FARCIMEN (FARCIMEN) SUPERBUM, new species 



Shell large, rather stout, very elongate-ovate. Early whorls wax 

 yellow, gradually turning darker, the major tint being chestnut- 

 brown ; the last whorl may even be purplish. Nuclear whorls about 2, 

 small, well-rounded, smooth. Postnuclear whorls inflated, strongly 

 rounded ; the early ones marked by slender, well-elevated axial riblets, 

 which are rather distantly spaced. These riblets evanesce, and on the 

 last two turns they are indicated as mere lines of growth. Suture 

 strongly constricted. Periphery well rounded. Base rather short, 

 well rounded, moderately broadly openly umbilicated, with a rounded 

 carina at the outer termination of the umbilical wall. Aperture circu- 

 lar; peristome decidedly thickened and reflected, produced on the 

 middle of the columella wall, and much narrower and somewhat sinu- 



