208 PLEUROBRANCHUS. 



red color, very small, 4 mill, long, 3 wide in an example, the man- 

 tle of which, in spirits, measures 25 mill, long, 16 wide; in life 50 

 long, 30 wide. In the spirit examples the warts of the mantle are 

 more intense red than their interstices. 



P. GRANULATUS Krauss. 



Alcoholic specimen : Body small, ovate-oblong, convex, soft, 

 granulate above ; mantle entire, the ends rounded ; head-shield 

 dilated, truncate, slightly horned at the sides, tentacles shorter. 

 Foot emarginate behind, extending backward about as far as the 

 mantle; color? Gill delicate, 3 lines long. Length of animal 8 

 lines. 



Shell situated in the middle of the mantle, calcareous, elongated 

 and narrow, with distinct growth-striae and a little spire at the sum- 

 mit. Length 1'7, breadth 0*5 lines. (Krauss). 



False Bay, Cape of Good Hope (Wahlberg). 



Pleurobranchus granulatus KRAUSS, Die Siidafrik. Moll., p. 61, 

 (1848). 



P. OBLONGUS Audouin. PI. 49, figs. 39, 40, 41. 



Body oblong, the length slightly exceeding twice the width, 

 rounded at the two ends, very convex above. Length 29, alt. 12 

 mill. Shell elongated, somewhat triangular. 



Red Sea f 



SAVIGNY, Descr. de 1'Egypte Gastrop., pi. Ill, f. 1. Pleuro- 

 branchus oblongus AUD., Expliq. des planches de Savigny, Descr. 

 de 1'Egypte, ed. 2, Vol. xxii, p. 140 (1827). ISSEL, Malac. Mar 

 Rosso, p. 163. 



This species is based on Savigny's figures copied on my plate. It 

 is presumably from the Red Sea, but this is not positively known ; 

 it may possibly be Mediterranean. Vayssiere places it as a doubt- 

 ful synonym under his PL monterosatoi. Cantraine (Malac. Medit. 

 et Lit., p. 90) identifies with oblongus an Adriatic form found by 

 him, but states that he doubts their identity because his species has 

 the back absolutely smooth, while Savigny's figures seem to show it 

 warty. Moreover, the genital apertures are different from known 

 Mediterranean species. 



P. CITRINUS Riippell & Leuckart. PI. 48, figs. 29, 30, 31. 



Alcoholic specimens : Pale citron-yellow, marbled with irregular 

 whitish spots on the back of the mantle. Mantle entire and rounded 



