782 CLASS xni. 



colour is purplish or blue and the length nearly if inches. See Proceed. 

 Zool. Soc. 1836, pp. 113 189. These animals are found in the Atlantic 

 Ocean principally between the tropics. 



Scyllcea L. Body compressed, with foot furrowed longitudi- 

 nally. Head furnished with two tentacles. Back with two expan- 

 sions or membranous and flexible wings on each side. Branchiae 

 penicillate, composed of filaments, scattered over back, especially 

 crowded in the wings. 



Sp. Scyllcea pelagica L., Cuv. Ann. du Mus. vi. pp. 416, 417, PI. 61, figs, 

 i 7, Mollusq., Mm. vi. ; BLAINV. Malac. PI. 46, fig. 5 ; this species 

 attaches itself by its furrowed foot to Fucus natans, and is found in the 

 Atlantic ocean ; Scyll. ghomfodensis observed by FOBSKAL in the Red Sea 

 appears to be the same species. Descr. Animal, p. 103, fig., Tab. 39, 

 figs. C. c. Anatomy, ALD. and HANG. Monogr. Fam. i y PI. 5. 



Dotti OKEN 1 , Melibea (or Melibcea) RANG. Body limaciform, 

 with foot narrowed posteriorly. Mouth with a circular velum. 

 Two filiform tentacles, defended by an ample cup-shaped sheath. 

 Branchiae papillose, grouped in muricate clavae, disposed in a double 

 lateral row on the back. Apertures of generation and of rectum 

 at the right side. 



Sp. Doto coronata, Doris coronata GMEL. (species of Tritonia Cuv.), BOMME 

 Verh. van het Zeeuwsch Genootsch. I. 1769, Tab. in. bl. 314, coifed or 

 crowned Sea-slug JOHNSTON, Ann. of Nat. Hist. I. p. 117, PI. 3, figs. 

 5 8, D'ORBIGNY, GUJSRIN Magasin de Zool. 1837, Mottusq. PI. 103, 

 Anatomy in ALD. and HANC. Monogr. Fam, 3, PI. 4. 



Tritonia Cuv. Body subtetragonal or compressed, elongate, 

 anteriorly rotundate, posteriorly acuminate. Apertures of genera- 

 tion and of rectum at the right side, with vent situated behind the 

 genital orifice. Two tentacles retractile into a sheath. Circular 

 velum in front of mouth. Two lateral maxillae, acute, with margin 

 denticulate. Branchiae arborescent at the sides of back. 



a) With arborescent branchice remote, and sheath of tentacles with margin 

 laciniate. 



Dendronotus ALD. and HANC. 



Sp. Tritonia arborescens Cuv., Doris arborescens GM., Cuv. Mollusq., Mem. 6, 

 figs. 8 10 (probably not specifically different from Doris cervina GMEL., 

 the antlered Sea-slug BOMME, 1. 1. in. bl. -290, fig. i). Compare, on the 



1 Lehrb. d-er Zoologie, I. 1815, s. 273. 



