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 absent, the back being almost 

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

 alcohol, 5 mm." 



The principal anatomical 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. — Beitrage zur Kenntniss der Placophoren. Morph. Jahrb., 1894, xxi., 

 pp. 28-39, T. ii. 



Koford, C. A. — On Some Laws of Cleavage in Limax. 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 Limax. A number of very interesting results have already been obtained, 

 which we regret want of space forbids us recapitulating. 



Li I lie, F. R. — Preliminary account of the Embryology of Unio complanata. 

 Journ. Morph., 1893, vo '- vln -> PP- 5°9-78, 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 paper : — (1) "To settle definitely the question of the origin of 

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

 embryological research to the class of the Lamellibranchs. 



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

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

 pis. i. -v. 



Nobre, Augusto. — Observacoes sobre o systema nervoso e affinidades 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 



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



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



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

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



VARIATION. 



Carrington, John T. — Four Abnormal Shells. Sci. Goss., 1894, p. 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., p. 327. 

 Taylor, J. W. — Succinea oblonga, m. sinistrorsum. Ibid., p. 367. 



CLASSIFICATION, NOMENCLATURE, NEW GENERA AND 

 SPECIES. 



Ancey, C. F. — Sur quelques especes de Moll, et sur 1111 genre nouv. du lac 

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

 Lechaptoisia is a new name for Horea, Smith, 1889 {11011 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, 1S94, 

 vol. vi., pp. 321-30. 



