104 MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 



generally by three of the transverse grooves being of that 

 coloin-. Length half an inch, breadth an eighth. 



Deshayes' description agrees precisely : — " This species seems 

 intermediate between Clausiliae rugosa and ventricosa. It is 

 elongated, fusiform, finely and regularly striated ; its colour is 

 chestnut brown ; the tip is obtuse, the spiral turns little convex, 

 and the last turn bears on the back, before its termination, a 

 pretty deep groove which divides it into two ; in this part in 

 which the groove is, the striae are deeper and larger. The 

 aperture is oval, posteriorly angular ; it is white, and the 

 columella bears two prominent plaits, of which the most an- 

 terior does not advance like the other to the margin ; in the 

 bottom of the aperture is a third transverse plait. The length 

 is 13 millimetres, the breadth a little more than three." 



Clausilia dubia. Drap. Moll. 70. PI, 4. f. 10, 11.— Clausilia 

 dubia. Grav's Turton. 216. — Clausilia dubia. Lamk. Sysl. Ed. 2. 

 vii. 209. 



Genus 10. Balea. 



Animal with the body elongated, spiral ; the head 

 with four tentacula, the upper long, cylindrical, clavato- 

 capitate, oculiferous, the lower short, conical, obtuse or 

 capitate ; the foot small, slender, oblong, compressed. 



Shell oblongo-turrite, thin, with the spire tapering to 

 an obtuse point, the last whorl proportionally larger 

 than the next ; the aperture reversed, roundish or oval, 

 with the peritreme thin and simple. 



1. Balea perversa. Reversed Balea. 



Shell oblongo-turrite, slender, glossy, transparent, of eight 

 convex, transversely striated, distinctly separated turns, the 

 suture beuig deeply impressed; the spire tapering to an ob- 

 tuse point ; the aperture subovate, with the peristome thin, 

 simple, a little reflexed on the columella ; the umbilicus distinct; 

 the colour yellowish-grey, yellowish-brown, or dusky-brown. 

 Length from four to five-twelfths of an inch, breadth nearly a 

 twelfth. . 



Animal with the head and tentacula black ; the upper tenta- 

 cula long, filiform, witli an enlarged rounded tip, the lower 

 very short, conical, obtuse ; the foot oblong, depressed, semi- 

 transparent, pale purplish-grey. 



First found in June, 1842, by Mr. Leslie, while searching 



