ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 195 



/3. Myriopoda. 



New SpirostreptidsB.* — J. Carl describes new species of Foratnphilus, 

 Thyropygus and Doratogonus, and establishes two new genera, Stennuro- 

 streptus and Stenostreptus in this family of Diplopoda. Particular 

 attention is paid to the structure of the gonopods, which is of great 

 diagnostic value. 



S. Arachnida. 



Chondriosomes of Scorpion Spermatozoa.f — Edmond B. Wilson 

 contrasts the nuclear chromosomes and the cytoplasmic chondriosomes 

 carried by the spermatozoon into the egg. He has studied them in two 

 scorpions, Opidhacanthus elatus and Centrums exilicauda. In the latter 

 it is possible to conclude with certainty that the chondriosome material 

 is divided with exact equality among all the spermatozoa. It is concen- 

 trated into a ring-shaped body which is equally divided, so that each 

 spermatid gets a quarter. In Opisthacanthus the chondriosome material 

 has the form of about twenty-four fairly large, separate, hollow spheroidal 

 bodies scattered without discernible order in the protoplasm. In division 

 each spermatid receives six chondriosome spheres as a rule, but some- 

 times five or seven — a sort of hit-or-miss segregation. On its face the 

 contrast would seem to indicate that a wide distinction should be drawn 

 between chondriosomes and chromosomes in respect to their power of 

 division and their relation to heredity. 



Ulster Spiders.f — J. A. Sidney Stendall gives a list of what remains 

 (twenty-five species) of the late Mr. Thomas Workman's collection of 

 Ulster spiders. In Workman's list sixty-four species were recorded. 

 The author has made a fresh collection from Ulster, and gives a list of 

 sixty species. Of these, one species, Leptyphantes nebulosus Sund, is 

 new to Ireland, and five are new to Ulster. 



Ant-like Spiders. § — H. D. Badcock reports on a collection of ant- 

 like spiders from Malaya, including eight new species of Myrmarachne. 

 Many of the specimens were accompanied by ants from the same 

 localities. 



Swiss HalacaridaB.|| — C. Walter describes, from Swiss lakes, Limno- 

 halacarus ivalkeri (Walter), synonymous with Halacarus walkeri Walter ; 

 Soldanellonyx chappuisi g. et sp. n., a blind form with a very remarkable 

 calyx-like claw on the first leg ; S. parviscutatus sp. n. ; and Lohmanella 

 violacea (Kramer). 



*• Crustacea. 



Loss of Eye-pigment in Gammarus chevreuxi.f — E. J. Allen and 

 E. W. Sexton have made a Mendelian study of the progressive degenera- 



* Rev. Suisse Zool., xxv. (1917) pp. 383-409 (26 figs.). 



t Proc. Nat. Acad. Sci. U.S.A., ii. (1916) pp. 321-4 (11 figs.). 



X From Proc. Belfast Nat. Hist, and Phil. Soc, 1915-16, pp. 1-7. 



§ Proc. Zool. Soc, 1917, pp. 277-321 (12 figs.). 



II Rev. Suisse Zool., xxv. (1917) pp. 411-23 (13 figs.). 



•j Journ. Marine Biol. Assoc, xi. (1917) pp. 273-353 (7 pis.). 



