CURRENT LITERATURE. 35 



We will not tire the reader with pointing out further errors or inaccuracies. 

 The Society's previous list of 1883 is now regarded as a curiosity, and there is 

 every reason to believe that this, their latest development, will find a secure 

 slumbering place with its embryonic brother of 1883, until "the Society" next 

 attempts to deal with the nomenclature and classification of so small a section of 

 the Mollusca as our British Land and Freshwater forms. 



W.E.C. 



ANATOMY. 



Testacellae. (Journ. Conch., p. 423, 1891.) 



Dr. Simroth has been further investigating the Testacelltz, and finds that since 

 the publication of the works of Lacaze-Duthiers and Dr. Plate, his treatise 

 published in 1891 — but written in 1887 — requires some slight corrections. 



T. dubia from Caveretto, nr. Turin, and T. barcinonensis from Barcelona, are 

 perhaps only varieties of T. haliotidea. The T. haliotidea from Trieste, should be 

 ranged under the T. catalonica, Poll., and T. pecchiolii, Bgt., from Settignano, nr. 

 Florence. 



Referring to the origin of the retractor muscles of the pharynx and tentacles, 

 Dr. Simroth thinks that it is evident that the innervation — as pointed out by Dr. 

 plate — of these two muscles, cannot be held as an argument that they never were 

 united with the pharynx retractor. Possibly they may have had relations, as in 

 Daiidcbardiix. 



On the Genital organs of Helix. (Arch. fur. Naturgesch., pp. 1-65, 1S92.) 

 Dr. Schuberth gives a number of anatomical diagnoses, and upon structural 

 grounds confirms the distinctness of the generality of the species catalogued by 

 Kobelt. 



On the Anatomy of some Tasmanian L. Shells. (Pro. Linn. Soc. 

 N.S.W., vol. vi., pt. 1, 1 89 1.) C. Hedley. 



Anatomy and Physiology of Pholade dactyle. (Ann. de l'Univ. d. Lyon, 

 T. II. 1892.) R. Dubois. 



On the Colouration of the Tegument in the Cephalapods. (Arch. 

 Zool. Exp., vol. x., p. 277.) Dr. L. Joubin. 



On the Radula of Paludestrina jenkinsi, &c. (Ann. & Mag. N.H.,p. 376, 

 1892.) B. B. Woodward. 



EMBRYOLOGY AND DEVELOPMENT. 



The Development of Bythina tentaculata. (Ann. and Mag. N.H., 

 p. 411, 1892.) 



All students interested in the embryology of Gastropods are acquainted 

 with Dr. R. Erlanger's works upon the same. The above paper is especially 

 important, for Dr. Erlanger has, "in almost all important points . . arrived at 

 precisely opposite views to Sarasin," who has previously written at some length 

 upon this species.* 



The process of segmentation, the development of the blastopore and various 

 organs are minutely described. In opposition to Sarasin, Dr. Erlanger enforces 

 the following points : — 



" There is in Bythinia a separate mesoderm, which arises from the endoderm, 

 and the development of which from the two primitive cells is traceable step by 

 step. The archenteron proceeds from an invagination of the endoderm. The 



* P. Sarasin, " Entwicklung. d. By. tentaculata." Inaugural-Dissertation, Wiesbaden, 1882. 



