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, 5 lines long. Length of animal 8 
lines. 
Shell situated in the middle of the mantle, calcareous, elongated 
aud narrow, with distinct growth-striz 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 Stidafrik. Moll., p. 61, 
(1848). 
P. optonaus 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 ? 
Savieny, Descr. de Egypte Gastrop., pl. ILI, f. 1—Pleuro- 
branchus oblongus Aup., Expliq. des planches de Savigny, Deser. 
de l’Egypte, ed. 2, Vol. xxii, p. 140 (1827).—IssrL, Malac. Mar 
Rosso, p. 165. 
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. Vayssiére places it as a doubt- 
ful synonym under his Pl. monterosatoi. Cantraine (Malac. Médit. 
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. crrrmnus Rippell & 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 
