CURRENT LITERATURE. 39 



a deep black band, which shades off into a yellowish-grey. Foot-fringe yellow 

 with sepia lineoles. Sole yellowish ; lateral planes distinct from medium plane, 

 which latter is marked in a dendritic manner and- slightly lighter in colour. Rugee 

 large and flat. Respiratory orifice distinct. Keel al)senl, the back being almost 

 flat. Length alive, 24 mm. ; length in alcohol, 15 mm. ; length of mantle in 

 alcohol, 5 mm." 



The principal anatoniical characters are : — the absence of any sharp distinction 

 between sperm-duct and vas deferens, the enormous size of the free oviduct, which 

 dilates into a sac-like body at about a third of its length, and then constricting 

 passes into a pouch-like portion to which the retractor muscle is attached. 



Haller, B. — IJeitrage zur Kenntniss der I'lacophoren. Morph. Jahrb. , 1S94, xxi., 

 pp. 28-39, T. ii. 



Koford, C. A. — On .Some Laws of Cleavage in Li max. Proc. Acad. N.S., 

 Phil., 1894, pp. 180-203, pis- 1-2. 

 This is a preliminary communication giving the results of a study of cleavage 

 in Linta.x. A number of very ir.teresting results have already been obtained, 

 which we regret want of space forbids us recapitulating. 



Lillie, F. R. — Preliminary account of the Embryology of Unio coniplanata, 

 Journ. Morph., 1893, vol. viii., pp. 569-78, pi. xxviii. 

 Some preliminary remarks on the segmentation and gastrulation. The work 

 has been undertaken with the two following objects, of which fuller details are 

 promised in a later pajier : — (i) "To settle definitely the question of the origin of 

 the germ layers in the UninniJiC, and (2) to extend the cytogenetic method in 

 embryological research to the class of the Lamellibranchs. 



Nabias, M. B. de. — Recherches llistolog. et Organologiques sur les centres 

 nerveux des (iastropodes. Act. L. Soc. Bordeaux, 1894, xlvii., pp. 11-202, 

 pis. i.-v. 



Nobre, Augusto. — Observacoes sobre o systema nervoso e afifinidades zoologicas 



de alguns pulmonados terrestres. Ann. de Sci. Nat., Porto, 1894, vol. i., 



pp. 17-20 and 75-78, pi. iii. 



We shall have occasion at a later date to review this interesting paper in some 



<letail, so will merely note that the present parts contain an introduction and an 



admirable account and figure of the nervous system of Arion hisitanictis, Mab. 



Suter, Henry. — On the Dentition of Pella hiiniupi, Melvill and Ponsonby. 

 Ann. Mag. N. II., 1894, vol. xiii., pp. 60-1., pi. v. B. 



VARIATION. 



Carrington, John T.— Four Aljnormal Shells. Sci. (loss., 1894, ]). 64, 4 figs. 



Mason, P. B. — Variation in the Shells of the Mollusca. Journ. Conch., 1894, 

 pp. 328-46. 



Taylor, J. W.— Abnormal Clausilia perversa. Ibid., ji. 327. 

 Taylor, J. W. — Suciinea obloiiga^ m. siiiistrorsiiiii. Ibid., p. 367. 



CLASSIFICATION, NOMENCLATURE, NEW GENERA AND 

 SPECIES. 



Ancey, C. F. — Sur quelques esjieccs dc .Moll, et sur un genre nouv. du lac 

 Tanganyika. Bull. Soc. Zool., France, 1894, vol. xix., p. 28. 

 Lechaploisia is a new name for Horea, Smith, 1889 {non Bourg., 1888). 



Ancey, C F. — Etudes sur la Faune des iles Sandwich : Monog. du genre Carelia 

 et description d"un Microcystis nouv. Mem. Soc. Zool., France, 1894, 

 vol. vi., pp. 321-30. 



