ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 307 



terrestrial Isopods occurring in the British Islands. After an introduc- 

 tion dealing with the structure, development, and habits of wood-lice, 

 the authors give a systematic account of 25 species belonging to the 

 following genera : — Ligia, Ligidium, Trichoniscus, Haplophthalmus, 

 Oniscus, Philoscia, Platyarthrus, Porcellio, Metoponorthus, and Arma- 

 dilUdium. We would commend, this welcome monograph — which is 

 beautifully illustrated — to the attention of naturalists. 



Regeneration of Antennae of Wood-Louse.* — Josef Ost finds that 

 the whole antenna of Oniscus murarius is regenerated in three weeks 

 when it is excised at the base. The details of the process are described. 

 When more than half of the basal joint is cut, autotomy follows. 

 Hitherto undescribed antennary glands are noted. 



Affinities of Hoplophoridse.f — H. Coutiere discusses the multiple 

 affinities of the deep-sea family, Hoplophorida?, with the higher Schizo- 

 pods (Lophogastridffi), with the Euphausidre, and with the Penasidse. 



Distribution of Gennadas.} — E. L. Bouvier discusses the facts 

 bearing on the depth distribution of Gennadas elegans and other species. 

 It seems that Benthesicymus is, in the strict sense, abyssal, and that 

 Gennadas is " bathypelagic," not normally occurring at the bottom, or 

 in its immediate neighbourhood. 



Relationships of Gennadas. §— E. L. Bouvier discusses the differ- 

 ences between Gennadas and Benthesicymus, and gives an account of six 

 species of the former. The genus Gennadas is derived from Benthesi- 

 cymus by adaptation to a bathypelagic mode of life, and the two genera 

 are linked by G. carinatus S. I. Smith and G. alicei sp. n. 



Phagocytosis and Excretion in Phyllopods.|| — L. Bruntz has ex- 

 perimented with a large Branchipod, Chirocephalus diaphanus, and finds 

 that in phagocytosis two kinds of elements are active — (1) the young 

 blood-corpuscles (" microphages "), and (2) large fixed phagocytic and 

 excretory cells (" macrophages "). The latter occur throughout the body, 

 but are especially abundant in the dorsal regions of the head and abdo- 

 men, in the latero-dorsal region of the thorax, and in the thoracic 

 appendages ; they are always on the course of blood channels. In the 

 process of excretion, three sets of structures are operative : (1) the 

 maxillary glands, (2) the large phagocytic cells mentioned above, and 

 (8) the anterior caeca of the gut. 



Parthenogenesis of Artemia salina.lf — C. Artom has investigated 

 the question of the parthenogenesis of A. salina, and finds that at Cag- 

 liari there is none. Virgin Artemia were kept under observation for 

 five months, during which time the eggs in the ovarian sac underwent 

 no change, whilst fecundated eggs placed approximately in the same 

 conditions, developed in four weeks. The males of Artemia at Cagliari 



* Zool. Anzeig., xxix. (1906) pp. 687-94. 

 t Comptes Rendus, cxli. (1905) pp. 219-22. 



X Tom. cit., pp. 686-90. § Tom. cit., pp. 748-50. 



|| Arch. Zool. Expei-., iv. (1905) pp. 183-98 (1 pi.). 

 H Biol. Centralbl., xxvi. (1906) pp. 26-32. 



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