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REPORT ON ZOOLOGY, MDCCCXLIV. 



because their tongues, according to Quatrefages' figures, as 

 well as from my researches with respect to Eolis, Glaucus, and 

 others, are remarkable for their narrowness ; the median 

 plates only are developed in them. The opposite condition 

 to this is exhibited in Bulla, Bull&a, and Gasttropterori, 

 in which it is the median plates or teeth that are deficient, 

 so that in consequence of the lateral teeth only being pre- 

 sent, two narrow separate tongues are constituted. On the 

 other hand, it may be expected that the extraordinary 

 organization as it is represented by Quatrefages, will disap- 

 pear before the eyes of a more circumspect observer. 



Joshua Alder and Albany Hancock institute (Annals, 

 xiii, p. 161) a new genus of Nudibranchiate Molluscs under 

 the name of Venilia, which is changed (ib. p. 407) into 

 Proctonotus. 



The body limaciform, ovate-oblong tapering to a point behind, depressed, 

 mouth with a pair of corneous jaws, four tentacula. The branchiae papillary, 

 elongated, arranged on a projecting margin down each side of the back. 

 Anus posterior on the medial line of the back. Genital aperture on the 

 right side. The species, F. mucroiiifera is figured, both the whole animal, 

 and the jaws, the tongue, and the branched appendages of the stomach. 

 The animal belongs to the Phlebeiiterata of Quatrefages, and is identical 

 with the genus Zeyphyrina, to which, however, the name Venilia, has the 

 priority. 



(Ib.) also by the same authors, are described some new species of the 

 genus Eolis, viz. : E. alba and Far rani from [Malahide near] Dublin, and 

 E. angulata, Northumbrica, gracilis, and violacea from Cullercoats, Northum- 

 berland. 



Eolis limacina and Scacchiana, Philippi (Euum. p. 73), the former with 

 short tentacles not projecting beyond the dorsal papilla? ; the second with 

 longer tentacles. 



Near Eolis and Calliopcea also belongs a new genus, Pterochilus, Alder 

 and Hancock. (.Annals, xiv, p. 329). The body is oblong, nearly linear, 

 tapering behind ; head anterior terminal, with a flat expanded lobe on each 

 side ; jaws corneous, two linear tentacles [dorsal], behind which the eyes 

 are placed ; branchiae papillary, elongated, on the sides of the back ; anus on 

 the right side behind the generative organs. P. pulcher, with a row of five 

 or six branchise on each side [of the back]. Branches proceed from the 

 gastric vessel to the papillae; 0'3 inch. Kothesay Bay, Isle of Bute. 



