130 PETALIFERA. 



Journ. de Conchyl., 1872, -p. 296. Aplysia webbii VAN BENEDEN 

 & ROBB, Mag. de Zoologie, 1836, cl. v, p. 3, pi. 77, f. 3a.-5. VAN 

 BENEDEN, Ann. Sci. Nat., iv, 1835, p. 251. Aplysiella webbii 

 MONTS., Journ. de Conchyl., 1877, p. 47. A. webi LOCARD, Ann. 

 de 1'Agric. Lyon, 1885, p. 68. Aplysiella weebbii VAYSSIERE, Rech. 

 Moll. Opistobr., p. 71, pi. 3, f. 70-76 (dentition, etc.). Aplysia 

 quadrata SOWERBY, Genera of Shells, fig. 4 ; Conch. Icon., f. 37a, 

 b. ? A. similis SOWB., C. Icon., f. 38a, b. (1869). 



The relations borne by this species to brugnateMi, ornata, and 

 especially depressa, are much in need of elucidation. There cannot 

 be much doubt that A. quadrata (pi. 55, figs. 13, 14) is the shell of this 

 species, and I am disposed to believe that A. similis (pi. 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. FERUSSACII Rang. PI. 55, figs. 7, 8, 9. 



Length 35 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 RANG, Hist. Nat. Aplys., p. 66, pi. 19, f. 6-9 (1828). 



Described from Ferussac's collection. The species has not been 

 recognized by later authors. 



P. BRUGNATELLII 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. The integument 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 ; rhinoph ores colorless. Sole colorless and diaphanous, showing 

 by transparence the viscera, which are a handsome blue. 



