1340 Journal of Applied Microscopy 



fluid. After injection the feathers should be properly arranged and the birds 

 hung by the bills, when they will dry rapidly. Specimens thus treated may be 

 softened subsequently and mounted in the usual manner. This method is not 

 only a rapid one, facilitating field work, but it also preserves the skeletons. 



c. A. K. 



Saint-Remy, G. Contributions a I'etude du The small size and the very resistant 

 developpement des Cestodes. Arcli. de la membranes of the eggs of tapeworms 



Parasit. 3: 292-315,0!. 7, 1900. , ^u ^ u • r^-u- ..ju 



^ J J' r y render the technique of their study by 



modern methods a matter of considerable difficulty. These difficulties have 

 been surmounted to some extent by Professor Saint-Remy, who has studied the 

 development of two species of Anoplocephala, parasites of the horse. After 

 removal from the host, the worms were kept in normal salt solution. Examina- 

 tion of the living eggs reveals but little, and the study of sections of the 

 proglottids for the development of the eggs contained therein is even less satis- 

 factory. The eggs are freed from the worm by compression or laceration, and 

 are collected upon slides in sequence from the last proglottid, forward as far 

 as they can be found, thus securing successive stages in development. The 

 eggs are killed upon the slide, and the coagulated fluid in which they lie serves 

 to fix them to the glass. A large number of reagents were tried, and good 

 results were obtained with the aqueous solution of corrosive sublimate, and also 

 with Carnoy's fluid (absolute alcohol 6 vol., chloroform 3 vol., glacial acetic acid 

 1 vol.). The eggs were not sectioned, but were mounted i?i toto in balsam. For 

 this purpose it was found that alum-carmin and also bleu de toluidin eosin gave 

 the finest results. 



The development of Anoplocephala resembles that of Taenia. A small egg- 

 cell and a large yolk mass are enclosed in the egg shell. The former gives 

 rise to two minute polar cells. Two of the cleavage cells invade the yolk, grow 

 at its expense into two giant cells which form the outer covering surrounding 

 the embryo, which is ultimately cast off. Three or four other cells form a 

 second envelope, a pyriform cap provided with branching filaments in the form 

 of a grapnel, and the balance of the embryonic mass forms the onchosphere or 

 embryo proper, within which the characteristic hooks are formed before the em- 

 bryonic membranes are shed. No decisive evidence is contributed to the 

 solution of the problem of the germ layers in Cestodes. c. a. k. 



^ _ ^, ^ ,.,. T • J J Students of our native reptiles will 

 Cope, E. D. The Crocodiiians, Lizards, and 



Snakes of North America. Report U. S. welcome this posthumous work of 

 Nat Mus.. 1898, 153-1270, 36 pis. with Professor Cope, for it is a very com- 

 347 figures in the text, 1900. ... 



prehensive manual, includmg all of the 



nearctic species of the orders of Loricata and Squamata. It is based upon the 

 extensive collections of the author, of the Philadelphia Academy of Natural 

 Sciences, and the U. S. Natural Museum. While it deals mainly with the 

 taxonomy of the group, it also gives many facts pertaining to the external and 

 internal anatomy, especially the osteology of the species described. Incidentally 

 reference is made to many interesting points in the biology and natural history 

 of the animals discussed. Ample synoptic keys are provided for the purposes 



