394 SUMMARY OF CUREENT RESEARCHES RELATING TO 



receptacle ; and in the relations of the inverters of the proboscis to the 

 proboscis receptacle. They may be included in a new family, Centro- 

 rhjnchidffi, to the species of which a diagnostic key is given. 



Nematodes in Insects.* — Merrill and Ford describe Diplogaster 

 JaUata sp. n. from the gut of an adult beetle, Saperda tridentata. The 

 numbers were so large that the wall of the gut was ruptured, causing 

 death. In the heads of termites, Leucotermes lucifugus, the investigators 

 found Diplogaster serivora sp. n., somethnes seventy-five in one host. 

 The Nematode also occurred in the soil about infested termitaries. 



Platyhelminthes. 



Bladderworms in House Fly.f— John E. Gutberlet finds that the 

 Cysticercoid stage of Choanotsenia infundibulifvrmis, a tapeworm of 

 chickens, occurs in Musca domesti'ca. Flies fed on the tapeworm's ova 

 developed the Cysticercoid ; chickens fed on flies developed the tapeworm. 



Structure of Duthiersia.$ — Frank E. Beddard gives an account of 

 the scolex in two species of this genus of tapeworms. In Duthiersia 

 flmhriata Diesing, from Monitor ?tiIoticiis, the bothria open by a con- 

 tinuous antero-lateral groove only ; the apical pit is at the extremity of 

 the scolex ; the excretory system forms an abundant network of small 

 tubes. In D. expansa Perrier, from Monitor hengaknsis and other Indian 

 forms, the scolex is larger ; the bothria open by a continuous antero- 

 lateral groove and by a separate posteriorly-situated pore, being thus 

 funnel-shaped ; the apical pit is not present ; the excretory system of 

 the scolex is represented by a less abundant network of larger tubes. 

 The author describes some minutiae of the structure of the scolex. 



Intermediate Host of Schistosomum mansoni.§— Juan Iturbe and 



Eudoro have investigated the life-cycle of this Trematode in Venezuela. 

 They infected Planorhis giiadelupensis with the miracidia, and observed 

 the whole subsequent development. They also infected Ampidlaria 

 Inteostoma and Planorhis cultratus, but these species do not seem to be 

 very liable to infection in their natural habitat. Each sporocyst pro- 

 duces fifty redite, of elongated or ovular shape, with a widely open 

 mouth and a rudimentary digestive system. The cercariae are cha- 

 racterized by a strong tail which is bifurcated throughout its distal 

 third. The mouth is larger than the acetabulum. The body is filled 

 up by three pairs of round glands, and does not show any vestige of 

 an alimentary canal. At the bottom of the oral orifice a cavity may 

 be seen ending in a blind sac. There is no pharynx. 



* Journ. Agric. Research, vi. (1916) pp. 115-27. See also Trans. Amer. Micr. 

 Soc, XXXV. (1916) p. 262. 



t Journ. Amer. "Vet. Med. Assoc, 1916, pp. 218-37. See also Trans. Amer. 

 Micr. Soc, XXXV. (1916) pp. 262-3. 



I Proc Zool. Soc. London, 1917, pp. 73-82 (5 figs.). 



§ Ex. Acad. Med. Venezuela, 1917, pp. 1-8 (2 pis.). 



