50 SUMMARY OF CURRENT RESEARCHES RELATING TO 



every space in the body. The nerve cord is derived from two rows of 

 cells in the larva which enlarge and pass inward ; the brain is derived 

 from a ring of cells in the base of the proboscis. The gonads appear as 

 two rows of cells dorsal to the intestine, and grow into solid strands not 

 covered by epithelinm. J. A. T. 



Structure and Development of Paragordius varius. — G. H. May 



(Froc. Amer. Soc. Zooh in Anat. Record, 1920, 17, o;35). The development 

 of this parasite of crickets is like that of Gordius rohustus in essential 

 features. The bristles are derived from the homogeneous layer of the 

 adult cuticle, not from the fibrous layer. There is an opening from the 

 anterior end of the intestine to the anterior end of the body when the 

 larval cuticle is shed. The ovaries are surrounded by parenchyma, and 

 double mesenchyme mesenteries are formed, which are quite absent in 

 Gordius rohustus. J. A. T. 



Life-cycle of Acanthocephala. — H. J. Van Cleave {Proc. Amer. 

 Soc. Zool. in Anat. Record, 1920, 17, 330). In the stomachs of white- 

 fish heavily infested with Echinorhynchus coregoni there were Amphipods 

 {Pontoporeia sp.) which contained larvae of E. coregoni. In a species 

 of HyaJella there were larv« of E. thecafus, and young small-mouthed 

 black bass fed on infected Hycdella developed a heavy infestation of 

 E. thecatus. There is probably an intermediate Vertebrate host between 

 HyaleUa and the definitive fish-host. . J. A. T. 



Intestinal Parasites in One Hundred Sick Filipino Children. — 

 Frank G. Haughw^out and Fe S. Horrilleno {Philippine Journ. Sci., 

 1920, 16, 1-73, 1 fig.). Of the hundred children ninety-two were 

 infected with one or more parasites. Under one year the incidence was 

 66 • 6 p.c. ; between the first and second years, 73 ' 6 p.c. ; all the children 

 between two and thirteen years were parasitized ; the earliest case of 

 parasitism was in a child of seven months. Xo Protozoon of proved 

 pathogenic effects was found, but the incidence of Spirocheeta eurygyrata 

 (without significant consequences) was notably high (61 p.c). Infec- 

 tions with Trichuris and Ascaris were serious. Hookworm occurred in 

 12 p.c. of the cases. No Cestodes or Trematodes were found. 



J. A. T. 



Platyhelminthes. 



Placocephalus javanus in Siam. — Tokio Kaburaki (Records 

 Indian Museum, 1920, 19, 39-40). This land Planarian, fairly 

 common in the Malay Archipelago (Java, Sumatra, Singapore), is now 

 recorded from Siam. It is protandrous and may multiply by transverse 

 fission. J. A. T. 



Notes on Japanese Triclads.— Tokio Kaburaki {Annot. Zool. 

 Japon., 1917, 9, 325-33). i\. Triclad frequenting the King-Crab, pre- 

 viously described as Procerodes limuU, is raised to the rank of a new 

 genus, Ectoplana, differentiated by the spacious vestibule receiving 

 directly the two oviducts. A description is given of Polycelis ijimai sp. n., 

 and a key to Japanese marine and fresh-water Triclads. J. A. T. 



