34 SCIENCE PROGRESS 



Functioning ; and II. Disposal of the Sexual Fluids in the 

 Organs of the Female " {Jour. Exper. Zool., vol. xxxi, No. 2, 

 Aug. 1920). The inability of young drones to fertilise is due 

 to the immature stage of the reproductive organs for the 

 first nine days. Sperms are stored in the sperm reservoir 

 and mucus in the mucus gland reservoir until ejaculated, and 

 then they do not mix to any appreciable extent. The sperms 

 are passed out first to fill the paired oviducts, and then the 

 mucus follows and fills up the vagina, where it hardens to 

 form a plug. Most of the sperms enter the spermatheca, 

 directed apparently by chemotactic stimuli, within six hours 

 of mating, while some of the mucus may remain for as long as 

 eighteen hours. 



Other papers include : 



Cockerell, " On South African Bees, chiefly collected in Natal," two parts 

 {Ann. Durban Mus., vol. ii, pts. 5 and 6, March and Aug. 1920) ; Jordan, 

 " Studies on Striped Muscle Structure : VII. The Development of the Sarco- 

 style of the Wing Muscle of the Wasp, with a Consideration of the Physico- 

 chemical Basis of Contraction " {Anat. Rec, vol. xix, No. 2, July 1920) ; 

 and Thompson and Snyder, " The ' Third Form,' Wingless Reproductive 

 Type of Termites " {Jour. Morph., vol. xxxiv, No. 3, Dec. 1920). 



Chordata. — " The Branches of the Branchial Nerves of 

 Fishes, with special reference to Polyodon spathula,^' are dealt 

 with by Allis {Jour, Comp. Neur., vol. xxxii, No. 2, Oct. 1920). 

 Each branchial nerve in Polyodon and Polypterus possesses a 

 ramus pharyngeus, rami praetrematici externus and internus, 

 rami posttrematici externus and internus, and a ramus dorsalis 

 supratemporalis. The same probably holds good for fish in 

 general. The pits of Polyodon are phylogenetically related to 

 the ampullae of the Selachii, but they do not respond to the 

 stimulus of pressure as those in the Selachii are said to do ; 

 they appear to be organs of taste or touch, probably the 

 former. 



Other papers include : 



Gilchrist, " Ecdysis in a Teleostean Fish Agriopus " {Quart. Jour. Micro. 

 Sci., vol. Ixiv, pt. 4, July 1920) ; Leigh-Sharpe, " The Comparative Mor- 

 phology of the Secondary Sexual Characters of Elasmobranch Fishes : the 

 Claspers, Clasper Siphons, and Siphon Glands," Memoir I {Jour. Morph., vol. 

 xxxiv. No. 2, Sept. 1920) ; Moodie, " Microscopic Examination of a Fossil 

 Fish Brain " {Jour. Comp. Neur., vol. xxxii. No. 3, Dec. 1920) ; Olmsted, 

 " The Results of Cutting the Seventh Cranial Nerve in Amiurus nebulosus 

 (Lesueur) " {Jour. Exp. Zool., vol. xxxi. No. 4, Nov. 1920) ; and Regan, 

 "A Revision of the Flat-fishes {Heierosomata) of Natal" {Ann. Durban 

 Mus., vol. ii, pt. 5, March 1920). . . . Dawson, " The Integument of Necturus 

 maculosus'' {Jour. Morph., vol. xxxiv. No. 3, Dec. 1920) ; Detwiler, " Ex- 

 periments on the Transplantation of Limbs in Amblystoma: The For- 

 mation of Nerve Plexuses and the Function of the Limbs " {Jour. Exp. 

 Zool., vol. xxxi. No. I, July 1920) ; and Kampmeier, " The Changes of the 

 Systemic Venous Plan during Development and the Relation of the Lymph 

 Hearts to them in Anura " {Anat. Rec, vol. xix, No. 2, July 1920). 



