42 SUMMARY OF CURRENT RESEARCHES RELATING TO 



deferens. Within this pocket the sperms remain protected from the 

 water, sometimes for months, until liy muscular contraction they are 

 discharged on the ova. The employment of a sperm-receptacle in 

 Camharus is a higher speciaUsatiou than the mode of indirect sperm- 

 transfer in Eurc>pean species of Astaciis. The nearest approximation 

 ^ would seem to be the sperm-receptacle of Homarus amerkanus, and that 

 would seem to have been acquired independently. With the evolution 

 of some sixty fomis of sperm-transferring organs in the males there 

 seem to have been evolved as many corresponding forms of amuili. 



Decapods of the Red Sea."' — G. Xobili gives an account of the 

 Decapoda and Stomatopoda of the Red Sea. Of Decapoda alone there 

 are 1X3 genera and 451 species. 



Mediterranean Cumacea.f — W. T. Caiman reports on a collection 

 of Cumacea made by the late F. A. Ki-npp in the neighbourhood of 

 Capri. It is interesting to notice that of the 25 s])ecies recorded from 

 depths exceeding 100 metres in the Jlediterranean, 15 occur at 

 corresponding depths off the West of Ireland. Some new species are 

 described : Giimellopfiis puritani, Procampylaspis bonnieri, GampyJaspis 

 vitren, C. spiiwsff, and Diasf//Jis rapripiisix. 



Variation-Study on Atyaephyra desmarestii.| — Arthur Brozek 

 has made a bionietric study of tlie variability of the ujjper and lower 

 rostral teeth, of the jwired denticles on the margins of the telson, and 

 of the distal setaa of the telson. There is a resume in German. 



Life-History of Polyphemus pediculus.§ — L. Tveilliack finds that in 

 the Krummen Lanke -near ik'rlin this ("ladoceran shows two repro- 

 ductive ])eriods in the year, one in June and a second in October. 

 After the first formation of resting eggs the animals become scarce ; 

 they increase steadily towards the time of the second reproduction ; in 

 winter they are entirely absent. The sh(jrt cycle is, as Ekman suggests, 

 a reminiscence of the short Arctic summer ; its repetition is an adapta- 

 tion to a temperate climate. 



Crustacea of the Forth Area.jl — Thomas Scott has published the 

 secoml part of his catalogue— a noteworthy piece of careful faunistic 

 work — dealing with 1:52 Ostracods, ;»o6 Copepods, and 13 Cirripedia. 



Polyandry of Scalpellum stearnsi.lF — P. P. C. Hoek points out that 

 in this species — one of the largest forms of the genus — from shallow 

 water off the coast of Japan, there is very pronounced polyandry. 

 As a rule, the number of males f(jund attached to the capitulum 

 of the female or of the hermaphrodite is one at each side only : in 

 some species it is two or three, and the largest numlter Hoek has ol)served 

 is five. But in Sc. stcarnsi, in which the large specimens with fully 

 developed capitulum are females, the part of the sac or mantle which 



* Ann. Sci. Nat. (Zool.) iv. (lOOfi) pp. 1-192 (11 pis.). 



t :MT. Zool. Stat. Neapel, xvii. (1906) pp. -111-32 (2 pis.). 



% SB. k. Bohm. Ges. Wiss., xi. (1904. received 1906) pp. 1-71 (1 pi.). 



§ Zool. Anzeig., xxx. (1906) pp. 911-12. 



II Proc. Roy. Phvs. Soc. Edinburgh, xvi. (1906) pp. 267-886. 



\ Proc. Section of Science, k. Akad. Amsterdam, viii. (1906) pp. 659-62. 



