198 PLEUROBRANCHUS. 
Insufficiently described Mediterranean species of Pleurobranchus. 
P. savii Verany. Body oval, compressed, “color nankino.” 
Mantle a little smaller than the foot, marbled with white and choc- 
olate. Tentacles and shell covered with ferruginous points; mar- 
gin of the foot tending to orange ; gill a little longer than mantle, 
of a clear azure color. Length 45, width 32 lines. Riviera di 
Ponente. 
(Verany, Catal. Anim. Invert. Mar. del Golfo Genova e Nizza, 
1846, pp. 16, 19). 
P. limacoides Forbes. P. corpore (repente) oblongo, levi auran- 
tiaco; pallio ovato, plano, contra-subemarginato ; cauda exserta lan- 
ceolata; tentaculis elongatis, linearibus. Long. 2} inch. Under 
stones near water-mark among the Cyclades. Allied to P. oblongus 
of Cantraine (Forbes, Rep. Agean Invert., Rep. Brit. Asso. Adv. 
Sci., 1848, p. 187 (1844). 
P. calyptreoides Forbes. P. corpore, ovato, leevi, citrino, pallio 
orbiculari convexo, cauda exserta lata obtusa, tentaculis linearibus. 
Long. 1} inch. On sponges, 20 fms., Cervi Bay, Morea (Forbes, l. 
ce): 
P. scutatus Forbes. P. corpore rotundato, rubro-aurantiaco ; pal- 
lio lato seabro, convexo, antice producto ; cauda pallio occulta; ten- 
taculis linearibus. Long. 1 inch. On Codiuwm tomentosum, in 20 
fms., Cyclades (Forbes, 1. ¢.). 
P. sordidus Forbes. P. corpore rotundato, convexo; pallio 
rugoso, sordide brunneo, antice producto; pede quadrato, albo; 
cauda brevissima ; tentaculis albis linearibus; ore aurantiaco. Long. 
inch. 40 fms., off Paros (Forbes, l. ¢.). 
(American species). 
P. QUADRIDENS Morch. 
Body with the mantle inflated, soft, oval; veil transverse, pro- 
duced laterally, slit in angles at each side ; foot angulate, without 
an anterior sulcus. Tentacles flattened, deeply slit, intorted ; gill 
plume rather short, with about 20 somewhat remote pinne on each 
side. Living animal bright orange, the young cinnabar colored. 
Lingual teeth long, slender, lightly arcuate, apex uncinate, in- 
curved, with 3 approximated teeth, of which the two smaller inferior 
ones are equal. 
