THE NEMATODE FAMILY GNATHOSTOMID^. 



271 



Specific Diagnosis. 

 Taxqua diadema Baylis. 



Head-bulb divided in the adult into two swellings, situated 

 dorsally and ventrally, each containing two ballonets. Head 

 retractile within the cuticular collar, which forms a prepuce-like 

 sheath. Yulva in middle third of the body. Uterus with two 

 opposed branches. 



Habitat: "intestines" (? stomach) of a sn&ke, Hel loops cmgu- 

 latus, in Brazil. 



Table IV. — Hosts and Distribution of the Species of Tanqua. 



Species. 



Host. 



Locality. 



Recorder. 



T. tiara 



Yaranns " ornafus " 



Xatal. 



V. Linstow (1879). 



Parona (1898). 



V. Linstow (1904 a). 



Baylis & Lane 



(present paper). 

 Leiper (1908). 



Parona (1898). 



V. Linstow (1904 rt). 

 Leiper (1908). 

 Baylis (191 G). 



Baylis_(1916) 

 (specimens deter- 

 mined by Leiper). 



[? T. tiara] ... 



(probably- V. albicjularis). 

 Yaranus saJvator. 



[_II(jdrosauri(s hivitt<vtus.] 

 Yaran i is (jov.l d i i . 



Varanns hengalensis. 

 Vara.nus niloticus. 



Varanus e:can tli eniaticus. 



Sumatra. 

 Ceylon . 

 India. 



Fed. Malay 



States. 

 Australia or 



New Guinea. 

 Cevlon. 

 White Nile. 

 Gold Coast. 

 Zanziliar. 

 Northern 

 ' Nigeria. 



T. anomaJa 



Tropidonotns piscator. 



Tropidonotiis ai^perrinnis 

 l = T. qnincmiciatus \ 

 (local t'oi m of T. piscator). 



Horn a 1 0 jysi.'i h u cca ta . 



" Water-siuiko." 

 " Snake." 



(^e.ylon. 

 India. 



Ceylon. 



Siam. 

 India. 



V. Linstow ( 1904 «). 

 Baylis & Lane 



(present paper). 

 Baylis (1916) [re- 



corded as T. tiara] 



Baylis & Lane 

 (present paper). 



T. diadema 



Selicops [_Uranop.'i] angii- 

 1 Jatns. 



Brazil. 



Baylis (1916). 



DouMful Species of Tanqua. 



ASCARLS SPH^ROOEPHALA Rud., 1809. 



Rudolphi (1809, p. 188). 



On account of certain resemblances between the characters of 

 this species, as described by Rudolphi, and those of the worms 

 of the Gnathostomid group, we mention it here for the sa,ke of 



