On Three new Parasitic Nematodes. 33.'> 



Of tliese "we consider points ii., iii., and especially iv. and 

 vi. the most important. The absence of scales, etc., is 

 probably due to degeneration. Another important cliara(;ter 

 is the condition of the alimentary canal. It differs fiom 

 that of Mnstacembelus and Rhijnchobdella * in the absence 

 of c?ecal pyloric appendages, and in its straight course and 

 sim})le strnctnre. 



All these points, considered together, we regard as quite 

 sufficient justification for retaining the family Chaudhuriidic, 

 which we may redefine as follows : — Minute and probably 

 degenerate Opisthomi devoid of spines in the fins, of a fieshy 

 tentacle on the snout, and of scales ; with a basisphenoid in 

 the skull ; with the otic capsules of exceptionally large size 

 and complex structure ; with the supracleith.rum and 

 cleithrum completely fused together, and with the elements 

 of the primary shoulder-girdle degenerate and barely dis- 

 tinguishable; with the alimentary canal almost str^jfght and 

 devoid of pyloric appendages. 



XXXVIII. — Preliminary Desaiptiuns of Three neiv Parasitic 

 Nematodes. By H. A. Baylis, M.A., D.Sc, British 

 Museum (Natural History), and K. Daubney, M.Sc, 

 Ll.R.C.Y.S., Ministry of Agriculture and Fisheries. 

 (Published hj permission of the Trustees of the British Museum.) 

 The following new forms occurred among material belonging 

 to the Zoological Survey of India, which unfortunately 

 reached us too late for inclusion in a report prepared by us 

 on the main collection of parasitic nematodes. Fuller 

 descriptions, with figures, will be published later, together 

 \\ith a report on the rest of this material. 



Crossocephalus brevicaudatus, sp. n. 



Host : Indian rhinoceros {Rhinoceros indicus). 



Position : stomach. 



Locality : Xepal, India. 



Three females only. Length 5-3-6*2 mm. Maximum 

 thickness up to 0*4 mm. No cervical papillae seen, except 

 those on the cuticular collar. CEsophagus 0*945-0"955 mm. 

 long. Excretory pore at I*22-l*35 mm. from anterior end 

 (buccal armature inverted), connected with an ovoid bladder 

 measuring 0'13x0"08 mm. Tail short and blunt, about 

 0*25 mm. long. Yulva at about 0"13 mm. from anus. 

 Uterus contains 6-8 embryos of various sizes. 



This species differs from C. longicaudatus^ Baylis^ already 



* Pay, Fish. India, p. 83S (1878). 



