588 SUMMARY OF CURRENT RESEARCHES RELATING TO 



into two acuminate or rounded peaks, beneath which the paired antennae 

 arise. The author also describes a new species of Bhawania, represent- 

 ing the family Chrysopetalidse. The body is elongated, with numerous 

 segments, with palege arranged in a transverse row, only denticulated 

 along the median edge. There is abundant illustration of setse, scales, 

 and parapodia. 



Remarkable Leech.* — Asajiro Oka describes AncyrohdeUa hiicse 

 g. etsp. n. from the Biwa Lake, the largest and probably deepest lake in 

 Japan. It was captured at a depth of about 80 metres. It is remark- 

 able in the possession of three hooks directed obliquely backwards, at 

 the anterior end of the long proboscis. Its internal structure is like that 

 of Glossiphonidte, e.g. in the lacunar system, the absence of lateral 

 sinuses, the simple gonads, the shape of the food-canal. A superficial 

 resemblance to Ichthyobdellids is deceptive. 



Nematoheiminthes. 



Oxyuridse of North African Reptiles.! — L. G. Seurat points out 

 that the Oxyurids from reptiles form a group of very primitive forms. 

 They are marked by broad lateral areas, composed of a small number of 

 very large cells, with obvious nucleus, in a simple row. The very 

 obvious excretory pore is in connexion with a refractive vesicle, into 

 which four canals open in a letter X fashion. The male often shows 

 lateral altB (cuticulai elevations) along the lateral areas, and sometimes 

 broad caudal ala3. Seurat deals with Phari/ngodon Diesing, Thelandros 

 Wedl, Tachygonetria Wedl, Strongyluris A. Mueller. 



New Nematode from Larval Fly. J — D. Keihn points out that the 

 larvae of Sciara pullida Winn., which make galleries in dead wood, often 

 show a large milk-white body filling the general cavity. Tbis is the 

 female of a Nematode (5 to 6 ram. in length) full of eggs. The 

 larvas also contain the much smaller males (1 • 9 mm. in length), trans- 

 parent and delicate. Pairing occurs in the dipterous larva, and while 

 the male degenerates the female enlarges. When mature it breaks from 

 its host, lays eggs in the burrows, and dies. The adults of Sciara found 

 infected were all females ; these are expelled from the insect's body in a 

 sort of hernia, and the insect behaves to them as if they were offspring. 

 The larval Nematodes enter the larval insects, probably through the 

 skin, for minute scars were seen. The name proposed for the new 

 Nematode is Aprodonema entomophayum, the generic name referring to 

 the absence of an anus. 



Races of Trilobus gracilis.§ — W. Stefanski discusses the reality of 

 distinct races of this cosmopolitan Nematode, and upholds at least four. 

 They are not modificational groups, for the same race may occur in very 

 ■different surroundings. 



* Annot. Zool. Japon, ix. (1917) pp. 186-93 (1 fig.), 

 t Arch. Zool. Exp6r., Ivi. (1917) pp. 401-44 (14 figs.). 

 X Comptes Rendus, clxv. (1917) pp. 399-401 (6 figs.). 

 § Rev. Suisse Zool., xxv. (1917) pp. 163-8. 



