and Laboratory Methods. '-^^SS 



CURRENT ZOOLOGICAL LITERATURE. 



CHARLES A. KOFOID, University of California. 



Books and Separates of Papers on Zoological Subjects should be Sent for Review to Charles A. 

 Kofoid, University of California, Berkeley, California. 



Slonaker, J. R. The Eye of the Common The eye was either fixed and hardened 



Mole, Scalops aquaticus machrinus. Jour. in situ, or, if removed, the orientation 

 Comp. Neur. 12: 335-366, pis. iS-20, 1002. • .. ■ j u i.^ 1 • -^ ^ 



^ •^•^■' -* ' ^ ' ^ was maintained by attaching it to a 



slip of paper until it was ready to be embedded. Perenyi's fluid preserved the 

 shape of the eye better than other fixing agents, but gave indifferent histological 

 detail. This was better preserved in 10 per cent, formalin or in potassium bichro- 

 mate. Saturated solution of bichloride of mercury, absolute alcohol, 10 per 

 cent, nitric acid, 50 per cent, alcohol, and platino-aceto-osmic mixture did not 

 give satisfactory results. The potassium bichromate usually caused the retina 

 to separate from the choroid and pigment layers. Sections were stained on the 

 slide in Ehrlich-Biondi, in Weigert's or Minot's haimatoxylin and in haemalum. 



C. A. K. 



..... ^ „ ^ . r , A J Nymphs were obtained at all seasons 



Cflild, C. M. Regeneration of the Appendages •' '^ 



in Nymphs of the Agrionida;. Arch. f. of the year in shallow ponds and 



Entwicklungsmechanick. 15: 543-602, pis. swamps in the vicinity of Chicago. 



20-22, 1903. JO 



They were kept in Stender dishes or 

 tumblers with a spray of Elodea to provide oxygen, and in addition the water 

 was aerated once in two or three days. It was necessary to isolate the individ- 

 uals in order to make record of results, and to prevent mutilation. To provide 

 for the emerging imago small sticks were placed in the aquarium reaching above 

 the level of the water and the dish was covered with gauze. The nymphs were 

 fed upon planarians, larvae of gnats and small amphipods. Sudden variations 

 in temperature were often fatal. Growth was most rapid at summer heat. 

 Alcohol gradually diffused through the aquarium did not produce quiescence in 

 the nymphs until the second day and they rarely survived the treatment. For 

 purposes of operation it was found admirable to place the nymph on a piece of 

 blotting paper on the stage of the dissecting microscope and to add a drop of 

 chloroform to the margin of the paper. Anaesthia followed immediately and the 

 nymphs recovered after the operation. c. a. k. 



Neuhaus, C. Die postenbryonal Entwickelung This Anguillulid nematode was ob- 

 der Rhabditis ni^rovenosa. Jenaisch. tained from the lungS of i?^?//^? /^^z/^^r- 

 Zeitschr. 37 : 653-690, Taf. 30-32, 1903. ..... . . 



aria, where it is found in association 



with Distomum cylindraceiim. Both lungs are usually infected and often con- 

 tain as many as 25 of the nematode worms. Great difficulty was encountered 

 in the fixing of the ova on account of the exceedingly resistant egg shell. The 

 following method was finally hit upon as the most effective. The worms were 

 fixed for 24 hours in Boveri's picro-acetic after cutting off both ends to permit 

 ready access of the fixing fluid. On 5/< sections superb nuclear and yolk differ- 



