104 MALACOZOA. GASTEROPODA. PULMOBRANCHIATA. 



generally by three of the transverse grooves being of that 

 colour. Length half an inch, breadth an eighth. 



Deshayes' description agrees precisely : " This species seems 

 intermediate between Ciausiliae 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, Tl. Clausilia 

 dubia. Gray's Turton. 216. Clausilia dubia. Lamk. Syst. 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 being 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, with 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 



