ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
193 
Araneidce 
If these views are correct the term Arachnida must have its signifi- 
cance limited or extended ; the author proposes the latter, and suggests 
the following tabular arrangement : — 
Class. Poecilopoda. 
Sub-class A. Trilobita. 
„ B. Arachnida. 
Order 1. Xiphosura. 
„ 2. Scorpionina. 
„ 3. Eurypterida. 
„ 4. Pedipalpi. 
„ 5. Araneas. 
Pantopoda of Albatross Expedition.* — M. W. M. Schimkewitsch 
describes the Pantopoda collected by the U.S. Fish Commission 
steamer off the west coast of Mexico and Central America and in the 
Gulf of California. A useful diagnostic table is given of the characters 
of seven species and one variety of the genus Colossendeis, of which 
G. bicincta and G. subminuta are new species. AscorhyncJius Agassizi , 
and Pallenopsis Galifornica are likewise new. 
e. Crustacea. 
Spermatogenesis in Decapod Crustacea.f — M. A. Sabatier has a 
lengthy memoir on this subject, to which he has given much attention 
for several years past. He finds the spermatozoa of Decapods to consist 
of a cephalic cap, which is derived from the atrophied and transformed 
nucleus, and he regards it as the nuclear appendage ; there is a head 
formed by the vesicle or secondary nucleus, and there are radiate 
filaments derived from the cytoplasm. This globular or radiate form is, 
* Bull. Mus. Comp. Zool., xxv. (1893) pp. 27-43 (2 pis.), 
t Acad, de Montpellier Mem. Sec. Sci., i. (1893) pp. 19-407 (10 pis.). 
