ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 205 



chromosomes) are supposed to yield males. The other spermatozoa 

 have 24 chromosomes (including 5 idiochromosomes), and are supposed 

 to yield females. 



Comparison of Ascaris felis and A. canis.* — H. Glaue has made 

 a careful comparison of these two species, which are so near one another 

 in general appearance. By a thorough survey he shows that they differ 

 in numerous anatomical and histological features. 



Strongylus pinguicola.f — J. Hellemans describes this Nematode, 

 which is the same as Diesing's Stephanurus dentatus and Verrill's 

 JSclerostoma pinguicola. He studied it in Java and Sumatra, where it 

 occurs in the domestic pig. The larva occurs in the portal system, the 

 adult in the abdominal fat, in the wall of the pelvis of the kidney, and 

 in the ureter. The parasites produce a very serious inflammation of 

 the portal vein, liver, and kidneys. 



Anti -coagulant Action of Nematode Extract.} — E. Emile-Weil 

 and Gr. Boye have found that extract of Ascaris equorum has a 

 retardative influence on the coagulation of rabbit's blood, and suggest 

 that this property may in part explain the haemorrhages caused by these 

 parasites. Anti-coagulants have been demonstrated in AnJcylostomam, 

 Ixodes, ffirudo, etc., by various investigators. 



Platyhelminthes. 



Trematodes from Tortugas.§— Edwin Linton describes a large 

 number of new Trematodes from Tortugas fishes and one from the 

 Loggerhead Turtle. A new sub-order (Deontacotylea) is established 

 for Deontacylix ovalis g. et sp. n., and a new family (Siphoderidae) for 

 certain forms with an anterior oral and a ventral genital sucker. The 

 Allocreadiinae are well represented, and some very interesting morpho- 

 logical problems are raised. Especially suggestive is the singular 

 Trematode fauna of the black angel-fish (Pomacanthus arcuaius), some 

 of the genera of which bear a strong resemblance to genera which are 

 characteristic of turtles. Attention is called to certain cells about the 

 neck and elsewhere in a number of Bistomes, e.g., Deradena ovalis g. et 

 sp. n., which are interpreted as yolk-forming. 



Echinostomidse of Birds. || — Eugen Diets: gives an elaborate 

 account of this family of Trematodes, the members of which are 

 characterized by a spinose head-collar round about the oral sucker, but 

 open ventrally. In most cases the shape is reniform. The author 

 recognizes no fewer than twenty-two genera, of which a large number 

 are new. The monograph includes diagnostic tables, arrangement 

 according to hosts, and the like. 



* Zeitschr. wiss. Zool., xcv. (1910) pp. 551-93 (26 figs.). 

 t Centralbl. Bakt. Parasitenk., lvii. (1911) pp. 212-39 (8 figs.). 

 X C.R. Soc. Biol. Paris, lxix. (1910) pp. 284-5. 



§ Publication No. 133, Carnegie Inst. Washington (1910) pp. 11-98 (28 pis.). 

 || Zool. Jahrb., Supp. xii. (1910) Heft 3, Festschr. Prof. Max Braun, pp. 265- 

 512 (6 pis. and 78 figs.). 



April 19th, 1911 p 



