38 CURRENT LITERATURE. 



structure, «S:c. , of the Mollusca as a whole, and then deals with each class or sub- 

 class, beginning with the Amphineura and ending with Cephalopoda, and giving 

 a succinct account under each, of its — (1) Morphology, (2) " Ethiologie " or, as 

 we should say, Bionomics, (3) Bibliography, and (4) Systematic Arrangement. 



The book abounds in illustrations in the text, very many of them being quite 

 new. In the future editions, which we feel sure will be soon required, they will 

 probably lie printed darker and so show to more advantage, while we would 

 suggest that the numbers used to indicate the several parts or organs should be 

 made to correspond ; it is rather trying, when comparing several illustrations, to 

 have to remember that some portion, say the gill, is No. v. in one figure, xi. in 

 the next, xiii. in the third, and so on. 



It is a work to get and to read carefully before relegating it to one's shelves 

 for future reference. — (BY-). 



Pilsbry, H. A. — Tryon's Manual of Conchology, ser. i., pt. 58; ser. ii., pt. 34. 

 Philadelphia. Academy of Natural Sciences. 



In the Marine series, part 5S completes the monograph of the Polyplacophora. 

 In noticing the completion we may ask why the group is not called Polyplaxiphora 

 since- this was Blainville's original term? If it is necessary to amend this name, 

 why then should Mr. Pilsbry use Cray's generic name of Plaxiphora~? Either 

 Blainville was right and his name should be used, or he was wrong, and then 

 Gray's generic name requires emendation. 



In noticing the Land scries, it is impossible in our space to consider the sub- 

 generic names; we shall therefore only note the genera. This part continues 

 Pyramidida, and Paiula is used only for the North American forms on the ground 

 of the priority of the former. We then pass through Pararhytida to Physanophora, 

 then to Sagda, of which a key is provided ; this would be of more use if S.jayana 

 and S. laminifera did not appear in more than one section of it. Zaphysci/ia is 

 a new genus (type Helix tenerrima, C. B. Ad.) for some Jamaican species. Next 

 to Praticolella and on to Pofyjsyra, with its numerous sections. Then through 

 Polyxvre/la and Polygyratia to Pleurondoute, which latter is resurrected to contain 

 Caracoltts, homeria, and other groups. Finally through Camcena and Ohba to 

 Planispira. E. R. S. 



STRUCTURE AND DEVELOPMENT. 



Babor, J., and Kostal, J. — Prispevky ku poznani pomeru pohl u nekterych 

 Limicidu. 



Sit/. Gesel. d. wiss Math.-Nat. Prag., 1893, pp. 1-7, T. xx. 

 An exceedingly interesting paper and very carefully illustrated. The authors 

 have compared a number of specimens of Agriolitnax and Malacolimax ; and figures 

 are given of what are termed new species, but they are as yet unnamed. We would 

 suggest before naming and describing as new species, that the exact form of the 

 generative organs should be noted in both in and out of the breeding season, as 

 many of the differences seem capable of being accounted for by distension, &c, 

 rather than true morphological distinctions. — W. E. C. 



Collinge, Walter E. — The Myology of some Pulmonate Moll, considered as 

 a distinctive feature in the discrimination of genera, <X:c. Proc. Malac. Soc. 

 Lond. , 1894, vol. 1, pp. 52-54. 



•Collinge, Walter E. — The Anatomy and Description of a new Species of.-/ riqn. 

 Ann. Mag. N. H., 1894, vol. xiii., pp. 66-7, pi. v. A. 



Description of a new species found at Wainsgrove, Somersetshire, by Mr. 

 E. W. Swanton. 



Arion e!ons;alits, sp. nov. " Head and tentacles blackish, the latter slightly 

 lighter than the head. Centre of mantle marked with a pyreforme mass of deep 

 black, bounded on either side by a narrow yellowish-grey line, below by a deep 

 black band which gradually shades off into a yellowish-grey. Whole of dorsal 

 surface a deep black, bounded, like the mantle, by a yellowish-grey line, then 



