228 ENID^E. 



Family ENID^E. 

 Genus ENA, Tvrton. 



Ena (Leach MS.), Tin-ton, Manual, 1831. p. 80: Gray, in Turton, 

 Man. Ed. n. 1840, p. 181. 



Bulimina, Ehrenberg, Symb. Phys. Anim. Evert, ser. 1, Moll. 

 1831; decas prima, signature d, fourth page (non Btdimina. 

 D'Orbigny, 1826). 



JBuliminus, Beck, Index Mollusc. 1839, p. 68 ; von Martens, Die 

 Heliceen, ed. 2, I860, p. 228; Lehmann, Leb. Schn. Stettins, 

 1873, p. 130 ; Hesse, Jahrb. Deuts. Malak. Ges. xii, 1885, p. 48 

 (anatomy) ; Westerlund, Fauna Palaarct. iii, 1887, p. 1 ; von 

 Martens, Besch. Weichth. Deutsch-Ost-Afrikas, 1897, p. 59; 

 Jacobi, Journ. Coll. Sci. Tokyo, xii, 1898, p. 76, pi. 6, figs. 113- 

 115 (anatomy) ; Wiegmann, Ann. Mus. Zool. St. Petersburg, vi, 

 1901, p. 220 (anatomy) ; Beck, Jenaische Zeit. Nat. xlviii, 1912, 

 p. 187 (anatomy). 



TYPE, Bulimus montanus, Draparnaud. 



Range. Europe, Africa, Continental Asia. 



Shell perforate, from shortly ovate and ovate-conoid to fusiform- 

 cylindrical. Aperture elongate, generally equalling 3 or ^ of the 

 total height ; peristome simple or thickened, straight, expanded, 

 or reflexed, the margins usually connected by a thin callus, with 

 or without a denticle near the upper margin ; columellar margin 

 straight. 



Animal (E. obscura) elongate-ovate, scarcely attenuated in 

 front, almost truncate, tail elongate, pointed ; greyish-yellow, 

 with dark grey head, back, and tentacles ; the latter frequently 

 giving off two dark stripes which run along the back. 



Jaw semicircular, slightly curved, with about 20 fine ribs 

 denticulating the margins. Eadula leaf -like anteriorly, attenuated 

 posteriorly, bearing 50 longitudinal and 125 transverse rows of 

 teeth. Middle tooth smaller than the laterals, with square basal 

 plate and hooked middle cusp, which is sharp, conical, simple. 

 Laterals with a pointed base and one or two short side cusps. 



Genitalia : the hermaphrodite gland is of the usual form, the 

 long chain-like ovisperm duct connecting it with the uterus, from 

 the base of which the vas deferens proceeds to the penis. The 

 penis is of peculiar shape, its lower portion being attenuated 

 towards the cloaca, and becoming dilated distally ; the latter short, 

 stout portion divides into two branches, the one proceeding up- 

 wards at a right angle, when it suddenly becomes twisted and, 

 forming another right angle, continues in a horizontal direction, 

 terminating in a rounded bulb, the latter receives the vas deferens. 

 The rather long retractor muscle is attached to the lower part of 

 the vertical portion. The other branch at first proceeds in the 

 same direction, then curves upwards at an obtuse angle, decreasing 



