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, Isevi auran- 

 tiaco ; pallio ovato, piano, contra-subemarginato ; cauda exserta lan- 

 ceolata ; tentaculis elongatis, linearibus. Long. 2f inch. Under 

 stones near water-mark among theCyclades. Allied to P. oblongus 

 of Cantraine (Forbes, Rep. ^Egean Invert., Rep. Brit. Asso. Adv. 

 Sci., 1843, p. 187 (1844). 



P. calyptrceoides Forbes. P. corpore, ovato, Isevi, citrino, pallio 

 orbiculari convexo, cauda exserta lata obtusa, tentaculis linearibus. 

 Long, li inch. On sponges, 20 fms., Cervi Bay, Morea (Forbes, I. 



.). 



P. scutatus Forbes. P. corpore rotundato, rubro-aurantiaco ; pal- 

 lio lato scabro, convexo, antice producto ; cauda pallio occulta; ten- 

 taculis linearibus. Long. 1 inch. On Codium tomentosum, in 20 

 fms., Cyclades (Forbes, I. c.). 



P. sordidus Forbes. P. corpore rotundato, convexo ; pallio 

 rugoso, sordide brunneo, antice producto; pede quadrato, albo ; 

 cauda brevissima ; tentaculis albis linearibus; ore aurantiaco. Long, 

 f inch. 40 fms., off Paros (Forbes, I. c.). 



(American species). 



P. QUADRIDENS M6rch. 



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 pinnae 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. 



