90 QUARTERLY CHRONICLE. 



that the author describes the muscular tissue in all parts as 

 transversely striated^ which is a very remarkable circumstance, 

 as it is certainly not so in Lumbricus. 



V. "Supplementary observations on the Anatomy and Classi- 

 fication of the HolothwncB ,"" by Dr. Emil Selenka. 



This is in continuation of the author's previous paper on 

 the same subjects in vol. xvii of the Zeitsch. f. wiss. Zool., 

 1866; since which he has been able to examine most of the 

 Holothurioe in the Berlin Collection, and the whole of those 

 contained in the Zoological Museum at Paris. 



The preseut paper contains systematic description of 

 several new genera and species. 



VI. ''Contribution to the Knowledge of the Sexual Reproduc- 

 tion of the Infusoria." Of this paper we have given a trans- 

 lation in another part of the journal. 



VII. " M. Landois' Theory contradicted by Experiment," by 

 Emil Bessels. 



The author shows by direct experiment, and apparently 

 quite successfullj^, that the strange assertions propounded by 

 M. Landois (Zeitsch., Bd. xvii, 1867, p. 375), that the 

 different sexes in the hive-bee depended upon the food upon 

 which the larvae were nourished, and not, as shown by 

 Dzierzon and Siebold, upon the impregnation or non-impreg- 

 nation of the ovum, is opposed to fact, and that the latter is 

 a true explanation. And that notwithstanding the discovery 

 by Claus of the long-wanting male of Psyche helix, the 

 dogma that fertilised ova alone are capable of development, 

 does not hold universally. 



8. " On the terminations of the Gustatory Nei've in the 

 Frog's Tongue," by Th. W. Engelmann. 



After a brief notice of the different views on this subject 

 entertained by Billroth, Fixsen, Hoyer, and Axel Key, the 

 author gives the results of his own observations, which are in 

 the main in accordance with and confirmatory of those of 

 the last-named author. 



The rounded terminal surface of the papilla fungiformes 

 presents three distinct forms of epithelial cells, which are 

 termed from their form the calyx-cells, cylinder-cells, and 

 furcate-cells ; all of which are peculiar to that part of the 

 papilla alone. 



The calyx-cells, which are by far the largest of the three 

 kinds, constitute the greater part of the epithelium, and 

 when viewed on the surface exhibit a sort of hexagonal, 

 tesselated appearance; and they constitute the outermost 

 layer of the epithelium. The cylinder-cells are, as the name 

 implies, elongated, slender bodies, extending from the deeper 



