ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 753 



eyes, while undergoing development, aie covered by an anterior expansion 

 of the caiajjace, is a remarkable one, which, so far as the authors know, 

 is (inly met with in one other group — an aberrant section of the Decapoda, 

 inclusive of Lucifer aud others, where this condition obtains in the 

 Protozoea-stage. 



Male of Phronima sedentaria.* — Prof. C. Chun has a note on the 

 male of Phronima sedentaria aud observations on other species of the 

 genus. Till quite recently this male Lad not been detected ; it is very 

 probable that it makes no special house for itself, as does the female. 

 When they are sexually mature they develope the lower pair of antennae; 

 at the Slime time lemarkable changes obtain in the appendages of other 

 segments ; the first joint of the flagellura of the anterior antennfe becomes 

 enormous, and gets a thick covering of hairs. The tibia and raetacarjius 

 (if the lilth thorac'c appendage become wider, and on the metacarpus, 

 with its cumjilexes of glands, of the oldest males three teeth btcome 

 apparent. By these and other changes in form the male of P. sedentaria 

 becomes very much like that of P. diogenes, as described by Glaus, 

 though there are, it is true, sevei'al points of distinction. The changes, 

 ofttn rap'dly effected, in the appearance of Phronimids should make us 

 very cartful of forming new species, and the author comes to the con- 

 clusion that P. atlantica Guerin-Meneville and P. pacifica Streets are 

 young stages of P. sedentaria, while P. w.vse-zealandise Powell and 

 P. borneensis Sp. Bate are adult stages of the same widely distributed 

 species. 



Pelagic Copepoda of Plymouth. f — Mr. G. C. Bourne has investi- 

 gated the Co[;epod fauna of the sea near Plymouth. He has been led to 

 this owing to the important part played by these minute Crustacea in 

 the change of material in the sea. Sixteen sjiecies were taken in the 

 tow-net, nine of which belong to the family Calanidfe. Oncsea mediter- 

 ranea is here for the first time recorded north of the Mediterranean. 



Female Generative Organs and Oogenesis in Parasitic Copepoda.l 



— Dr. J. H. List Las investigated the history of the female organs in 

 the Gastrodelphyidfe, parasitic Copepoda intermediate between the 

 Noiodelphyidfe and the Siphonostonjata. The ovaries and oviducts are 

 paired, there is a recej^taculum seminis, and two canals with external 

 orifices. Tlie formation of the egg-cells is eftected in the Gastrodel- 

 phyida3 in the ovary which is filled with polygonal cells. When formed 

 the eggs are cut off in rows and pass into the oviduct where they receive 

 the yolk-masses. The eggs which are given off" are rejilaced by others 

 formed in the anterior part of the ovary. The Linder part of the gonad 

 forms a kind of latent germinal layer, the function of which is to provide 

 cells for the anterior part. The ripe eggs, when set free, must pass the 

 receptacnlum seminis to reach the maternal cavity, and they are fertilized 

 in it. In conclusion the author makes some observations on the similar 

 parts in the Notodelphyida?. 



Vermes. 



Agamic Multiplication of Lower Metazoa § — M. Maupas, who has 

 shown that, by methodical cultivations of ciliate I Infusoria indefinitely 



* Zool. Anzeig., xii. (18S9) pp. .378-82. 



t Joiirn. IMarine Biol. A^soc, i. (1889) pp. ]4t-52 (2 pis.). 



i Biol. Centralbl., ix. (1889) pp. .327-3H. 



§ Comptcs Rendus, cix. (1889) pp. 270-2. 



1889. " 8 a 



