ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 329 



Arctic Nematodes.* — Dr. 0. von Linstow describes Ascaris decipiens 

 Krabbe from Tricheckus rosmarus, PJioca vitulina, &c. The larvre live 

 in crowds on the inner wall of the stomach with their heads in the 

 mucous membrane ; the adults are free in the intestine. Three larval 

 forms are distinguished. A number of Nematodes from Gadidae are 

 recorded, while Thoracostoma denticaudatum Schn., Spilophora punctata 

 sp. n., Enoplus edentatus sp. n., E. communis Bast., and Anoplostoma 

 gracile sp. n., are free-living forms. The author also compares the 

 arctic and subarctic with the subantarctic forms. 



Uncinarise in the Felidae.t — Dr. L. Cohn finds that three good 

 species of Uncinaria infest the Felidas, and he has been able to make 

 some observations on Uncinaria pemiciosa from a panther. This form 

 occurred in small dark-coloured nodules in the wall of the small intes- 

 tine, each nodule containing a number of individuals, the females always 

 being in excess. The nodules lay in the submucosa, and opened into 

 the lumen of the intestine of a small pore. In the intestinal mucus a 

 number of larvae were found, and the author believes that the life-history 

 is direct, there being no secondary host. The larvae pass directly into 

 the intestine of the host, and when sufficiently mature invade its wall 

 and cause the nodules. 



Platyhelminthes. 



Classification of Platyhelminthes.} — Sig. V. Ariola proposes a new, 

 confessedly somewhat artificial, grouping of Platyhelminthes : — 

 I. Sub-class. Trematoda. 

 II. „ Cestodaria, — Caryopbyllidae and Archigetidse. 



III. „ Cestoda. 



1. Order Dibothria. 



A. Sub-order Atomiosoma : — Ligulidae, Tricuspidaridae, 



Bothriruonidas, and Cyatobothridaa. 



B. Sub-order Tomiosoma : — Leuckartidaa, Dibothriorhyn- 



chidas, Dibothriotetrarhynchidas, and Dibothridae. 



2. Order Tribothria = Scyphocephalidaa. 



3. Order Tetrabothria. 



A. Sub-order Tetrabothriina (including Mesoporina and 



Pleuroporina). 



B. Sub-order Tetracotylina (incl. Mesoporina and Pleuro- 



porina). 



4. Order Octobothria - Octobothrida?. 



Classification of Cestodes.§ — Herr M. Lube criticises Ariola's classi- 

 fication of Cestodes. Thus the order Octobothria cannot be upheld, for 

 the only representative is Octobothrium rostellatum Dies. = Taenia erythrini 

 Fabr. 1780, which has not been found since the time of Fabricius. Again, 

 as to the order Tribothria, represented by Scyplwcephalm bisulcatus 

 Eiggb., only two of the suckers are comparable to those of Bothrio- 

 cephalus, the third is a quite differently constructed suctorial organ. 



* Fauna Arctica (Romer and Schaudinn), Bd. i. Lief, i., Jena, 1900, pp. 119-32 

 (1 pi.). See Zool. Centralbl., vii. (1900) pp. 244-5. 



t Arch. Parasitol., ii. (1S99) pp. 5-22. See also Amer. Nat., xxxiv. (1900) p. 72. 



t Atti Soc. ligust. Sci. Nat., x. (1S99) pp. 5-12. See Centralbl. Bakt. u. Par., 

 xxvii. (1900) pp. 345-6. § Zool. Auzeig., xxii. (1S99) pp. 539-43. 



