464 SUMMARY OF CURRENT RESEARCHES RELATING TO 



New Tapeworm from Wild Duck.* — T. B. Rosseter describes Hyme- 

 nolepis acicula sinuata, a new species of tapeworm from Anas boschas 

 /era. A striking feature is the absence of a cirrus and its accessories. 

 No actual coition takes place, but merely impregnation in its primitive 

 form of transmission. In place of an elaborate copulatory apparatus 

 there is a simple infundibuliform canaliculus genitalis. 



Parasites on Zeus faber.f— J. Fiebiger describes superficial growths 

 on the skin of this fish, which were found to be caused by a larval 

 Distomid Trematode in the sub-genus Echinostomum Bud. Other 

 parasites that often occur encysted in the skin of fishes are Ichthyo- 

 pldhirius and Holostomum. 



Trematodes from Birds.} — L. A. Jagerskiold describes Spelophallus 

 primas g. et sp. n. from the oyster catcher, a type very near Spelotrema. 

 From a gull (Larus marinus) he got Spelotrema excellent Nicoll ; from 

 the ringed plover, Maritrema linguilla sp. n. ; from the common sand- 

 piper, M. subdolum sp. n. He gives a useful synoptic table of species of 

 Maritrema. It is pointed out that the small Monostomid cysts (of 

 Galaetosomum lacteum), often seen on the brain of Oottus scorpius, 

 become adult in the cormorant. 



New Species of Monostomum.§— A. Arnsdorff describes from 

 Arquatella maritima a new species of Monostomum which he calls 

 M. vicar ium. 



Planaria alpina in Auvergne.|| — A. Bruyant reports that in sprjngs 

 of the Alpine zone, where the temperature is about 4°C, the only 

 Planarian is P. alpina ; in springs with a temperature of 4-6° C. 

 P. alpina occurs, or Polycelis cornuta, or both ; in springs with tem- 

 peratures above 6° C, P. alpina was not found. As Zschokke points out, 

 P. alpina is a stenothermal Glacial species. 



Regeneration in Nemerteans.H — 0. Dawydoff describes the regene- 

 ration of the posterior end in a large species of Cerebratulus. The 

 re-growth takes place wherever the cut is, even when it is close behind 

 the" mouth. The regenerated part differs from the rest of the body in 

 size and colour. If the head is removed from the piece the re-growth 

 of the posterior part is much slower, and the same is true in Saccoeirrus, 

 Protodrilus, and other Annelids. It is probable that the absence of the 

 cephalic ganglia slows the regeneration. The rate also varies with the 

 temperature of the water, the age of the worm, the size of the piece, etc. 

 All the organs may be regenerated except the gonads. A careful account 

 of this organogenesis is given. 



* Journ. Quekett Micr. Club, 1909, pp. 393-402 (1 pi.). 



t Oentralbl. Parasitenk., xlvii. (1908) pp. 62-9 (2 figs.). 



X Op. cit., xlviii. (1908) Abth. i., pp. 302-17 (7 figs.). 



$ Op. cit., xlvii. (1908) pp. 362-6 (2 figs.). 



|| Comptes Rendus, cxlvii. (1908) pp. 937-8. 



f Bull. 'Acad. Imp. Sci. St. P6tersbourg, vi. (1909) pp. 301-11 (12 figs.). 



