592 SUMMARY OF CURRENT RESEARCHES RELATING TO 



described is the nearest relative. Along with Rhabdogaster the Chaeto- 

 somatidae may perhaps lie ranked as a group or sub-order of Nematodes, 

 and the designation Nematochsetae is suggested. 



Peculiar Free-living Nematodes.* — A. Schepotieff describes Tri- 

 choderma oxycaudatum Greef, a remarkable marine Nematode, which has 

 been previously observed by Greef, Metschnikoff, and Panceri. The 

 head has wing-like outgrowths, the posterior end is pointed and has two 

 spicules. In these respects Trichoderma is like a Desmoscolecid. but it 

 is excluded from the family by the thick covering of hair and the absence 

 of setaa. It seems to require a special family, and the term Chaetiferae is 

 suggested. 



Schepotieff also describes Khabdogaster cygnoides Metschn., previously 

 observed by Metschnikoff, Greef, and Panceri. The body is divided by 

 a narrow region into two expanded portions. The longitudinal muscu- 

 lature is weakly developed. It uses its buccal teeth in its peculiar 

 locomotion. Probably its position is among the Chaetosomatidae. 



Platyhelminthes. 



Trematode in Hibernating Gland of Hedgehog.f — M. Athias des- 

 cribes a Distomid — which he has not yet been able to identify — from the 

 interior of the hedgehog's hibernating gland. It seems to be quite 

 different from D. rami at inn, which has been recorded from this host. 



Trematodes in Fishes.J — Marie Y. Lebour has examined many 

 different kinds of British fishes, and has added considerably to the 

 British records of Trematode fish parasites. In her list she gives useful 

 notes on the food of the fishes in question. The following are new : — 

 Prosorhynchus grandis in cod and whiting ; St&ringophorus ovacutus in 

 long rough dab : Lepodora elongata in cod ; Pharyngora retractilis in 

 whiting ; Stephanochasmus rhombispinosus in whiting ; S. triglce in grey 

 gurnard ; Plectanocotyle cavdata on the gills of 50 p.c. of grey gurnards. 

 These are new species, but Pharyngora is also a new genus. 



Uncertain Species of Marine Triclads.§ — J. Wilhelmi points out 

 that Planaria savignyi Ruppell and Leuckart is a typical Polyclad, 

 probably a species of Prosthiostomum ; P. longiceps Duges is equi- 

 valent to Monotus bipunctatus ; Bdelloura rustica Leidy is a Monotid ; 

 Planoides fusca Daly ell was probably not a Triclad ; and Planaria hsbes 

 Dalyell was probably P. torva Mull. 



Planaria Wytegrensis.|| — H. Sabussow describes this new species 

 from Lake Onega and compares it with the closely allied Planaria 

 gonocephala, from which it differs in having peculiar sensory cells in the 

 epithelium, in having more numerous sensory pits (on the ventral 

 surface of the anterior end), and " in various details of the genital 

 svsteni. 



* Zool. Jahrb., xxvi. (1908) pp. 385-400 (2 pis.), 

 t Bull. Soc. Portugaise Sci. Nat., i. (1908) pp. 192-201 (3 pis.). 

 X Rep. Sci. Investigations for 1907, Northumberland Sea Fisheries Committee, 

 1908, pp. 23-67 (5 pis.). § Zool. Anzeig., xxxiii. (1908) pp. 33-7. 



|| Zool. Jahrb., xxiii. (1907) pp. 741-7 (2 pis.). 



