130 PETALIFERA. 
Journ. de Conchyl., 1872, p. 296.—Aplysia webbii VAN BENEDEN 
& Ross, Mag. de Zoologie, 1836, cl. v, p. 3, pl. 77, f. 3a.-b—Van 
BENEDEN, Ann. Sci. Nat., iv, 1835, p. 251—Aplysiella webbii 
Monrs., Journ. de Conchyl., 1877, p. 47.—A. webi Locarp, Ann. 
de Agric. Lyon, 1885, p. 68.—Aplysiella weebbti V AYssIERE, Rech. 
Moll. Opistobr., p. 71, pl. 3, f. 70-76 (dentition, etc.)—Aplysia 
quadrata SowERBY, Genera of Shells, fig. 4; Conch. Icon., f. 37a, 
b.—? A. similis Sows., C. Icon., f. 38a, 6. (1869). 
The relations borne by this species to brugnatellii, ornata, and 
especially depressa, are much in need of elucidation. There cannot 
be much doubt that A. quadrata (pl. 55, figs. 13, 14) is the shell of this 
species, and I am disposed to believe that A. similis (pl. 19, figs. 32, 
33) is the same, though Sowerby says that it is “more obliquely 
oval, more laterally curved, and less quadrate than A. quadrata.” 
P. reRussacit Rang. PI. 55, figs. 7, 8, 9. 
Length 85 mill. Oblong, much swollen and short behind, length- 
ened in front ; swimming lobes elevated, especially behind, narrow. 
Mantle oblong, with a very large orifice ; foot narrow. 
Color livid brown, variegated with large and very irregular black 
spots. 
Shell nearly round, pale and diaphanous, resembling a thin film ; 
the sinus is almost wanting, apex very small. Length 8 mill. 
Habitat unknown. 
A. ferussacii Rane, Hist. Nat. Aplys., p. 66, pl. 19, f. 6-9 (1828). 
Described from Férussac’s collection. The species has not been 
recognized by later authors. 
P. BRUGNATELLUT Vanbeneden & Robb. PI. 36, figs. 11, 12. 
Length 35 mill. Body elongate, widened, swollen in the middle, 
tapering towards the ends. Foot strongly depressed and rounded 
posteriorly ; pleuropodial lobes small, separated, showing the greater 
part of the mantle. Theintegument around the mouth is prolonged 
in two appendages. ‘Tentacles, genital openings, etc., as in the 
genus. 
Pale, dappled with irregular orange spots, border of mantle pur- 
ple; rhinophores colorless. Sole colorless and diaphanous, showing 
by transparence the viscera, which are a handsome blue. 
