ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 303 



The yellow eggs are laid in fissures in the rocks, and those of 

 individual females are not kept separate. They are spherical in form, 

 about 0'3 mm. in diameter, and thus well suited for embryological 

 study. An account of the development is given, mainly corroborating 

 the results of previous observers. The memoir concludes with a useful 

 chapter on marine insects. 



•y. Mjrriopoda. 



Spermatocytes of Lithobius.* — M. W. Blackman discusses the 

 ■condition of the chromatin during the growth period and its later 

 behaviour in the prophase. The results obtained in Lithobius confirm 

 the author's earlier work in ScoUrpendra, in which he found that the 

 chromatic threads in the growth period are aggregated into a very dense 

 mass, the karyosphere, and at the beginning of the prophase the 

 chromosomes arise from this mass directly. 



5. Arachnoidea. 



Pseudoscorpion of Guatemala.! — E. W. Berger makes a note on the 

 occurrence of Afemnus elongatns Banks, east of the highlands of 

 Guatemala. It has previously been recorded from Florida only. 

 Examination of the specimens showed that the female is fertilised prior 

 to egg-laying, and that she may retain the spermatozoa for some short 

 time (if not for a longer time) before the eggs are fertilised and laid. 



Nymphon parasiticum.J— H. Merton describes the larva of a Pycno- 

 gonid (yNymphon paras iticimi, sp. n.) which he found as an ectoparasite 

 on Tethys leporina. The eggs seem to be deposited singly under the 

 epidermis of the Nudibranch (on the foot or about the head), for various 

 stages from ova to well-developed larvae were found. In all other 

 known cases the male Pycnogonids carry the ova. 



6. Crustacea. 



Decapod Spermatozoa. § — Karl Grrobben discusses some of the 

 peculiar forms of spermatozoa found in Decapods, e.g. of Pasiplma 

 sivado, Fandaliis narwal, Nephrops norvegicus, Xantho rivulosiis, HomoJa 

 spinifrotis, Pagurus calidus, Pisa, Portunus eorrugaiiis, Palinurus, and 

 Scyllarus. He shows that resemblance in the forms of spermatozoa 

 oannot be depended on as indicating relationship of the types, though 

 sometimes related types have similar forms of spermatozoa. 



New Fresh-water Decapod from Para.|| — W. T. Caiman describes 

 EuryrJnjnckus hurclielli, sp. n., a small shrimp-like animal (Palaemonid), 

 little more than half an inch in length, collected by Burchell from a 

 well at Parji in 1821). He adds some notes to Miers' description of the 

 type species E. wrzesnioivshii. 



* Proc. Amer. Acad. Arts and Sci., xlii. (1907) pp. 489-518 (2 pis.), 

 t Ohio Nat., vi. (1906) pp. 489-91 (1 pi.). 

 X MT. Zool. Stat. Neapel, xviii. (1906) pp. 136-41 (1 pi.). 

 § Arbeit. Zool Inst. Univ. Wien, xvi. (1906) pp. 399-406 (1 pi.). 

 II Ann. Mag. Nat. Hist., xix. (1907) pp. 295-9 (8 figs.). 



