ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 3'Jl 



British Collembola.*— John W. Shoebothani gives a transktion of 

 Borner's classification of the Collembola and a useful list of the i-i 

 British genera, including Willoicsia g. n., allied to Sira. 



0. Myriopoda. 



Structure of Cylindroiulus nitidus.f — Hilda K. Brade and S. 

 Graham Birks describe the external features of this millipede found 

 near Leek, Staffordshire. An account is given of colour-markings, 

 appendages, ocelli, and male gonopods. As Verhoeff has pointed out, 

 the ocelli are of great interest, representing a condition intermediate 

 between Ommatoiidus and Allaiulus. The external surface of the field 

 of the eye is quite smooth, not broken up by the convexities of the 

 individual ocelli. There is great variation in the number of ocelli. 

 The structure of the male gonopods is described and figured in detail. 



e. Crustacea. 



Mouth-parts of Prawns.^— L. A. Borradaile gives an account of 

 the mouth-parts of PalaBmouid prawns, such as the common Leander 

 serratus. He .regards the primitive crustacean limb as consisting of a 

 flattened axis with a flabellum (exopodite), two or more epipodites, a 

 series of eight endites and an apical lobe, the flabellum standing opposite 

 the third and fourth endites. The relations of the various mouth-parts 

 to this prototype are discussed. Particles of food seized by the 

 chehpeds are generally received by the second maxillipedes which hold 

 it in place while pieces are torn off it by deeper lying organs, probably 

 in the main by the incisor processes. The maxillules may also receive 

 food from the chelipeds. In handling bulky masses the third maxilli- 

 pedes may assist the chelipeds or the second maxillipedes. The second 

 maxillipedes seem to be indispensable, and their movements are described. 

 The first maxillipedes and the maxilla probably take no very prominent 

 part in manipulating the food. The exopodites of the maxillipedes set 

 up a strong forward current which carries away exhausted water and also 

 the waste products of the green glands. But the current has also a 

 significance in the feeding process. From time to time particles are 

 rejected by the second maxillipedes, which kick them violently forwards, 

 the distal parts of the third maxillipedes at the same time straightening 

 so as to admit them to the outgoing stiieam, by which they are swept 

 away. 



Terrestrial Isopods from Chilka Lake.§ — Chas. Chilton describes 

 Ligia exotica, a maritime species usually found near the sea-shore, which 

 has adjusted itself to more purely terrestrial conditions on the shore of 

 Chilka Lake. The appendages are figured, and the young from the 

 incubatory pouch. The outer branch of the first pleopod of the male is 



* Ann. Mag. Nat. Hist, xix. (1917) pp. 425-36. 

 t Ann. Nat. Hist., xix. (1917) pp. 417-24 (8 figs.). 

 X Proc. Zool. Soc. London, 1917, pp. 37-71 (51 figs.). 

 § Mem. Indian Museum, v. (1916) pp. 461-82 (36 figs.). 



