1903.] ENTO-PARASITES OP THE " SKEAT EXPEDITION." 151 



Habitat. The alimentary canal of Bufo melanostictus Schneider 

 and of Bufo '^ penangensis Wilson & Gray, taken at Patani. 



ECHINORHYNCHUS XENOPELTWW, n. sp. (Plate XVI. fig. 3.) 



Three curious specimens of Echinorhynchidse were taken free 

 in the body of Xenopeltis unicolor, the sole species and genus of 

 the family Xenopeltidje, which ranges ovei' South-eastern Asia, 

 from India to the Malay Archipelago. Unfortunately, the part 

 of the host's body infested by the parasite is unnamed, but, presum- 

 ably, it was the intestine. 



The j)ai'asites are three in number, and measure respectively 

 about 25 mm., 17 mm., and 15 mm. I say about, because they 

 were all coiled in a curious, angailar sort of way, so that it was not 

 possible to straighten them. They are plump, fleshy-looking 

 creatures with an average breadth of 2 '5 mm., though in one 

 specimen a breadth of fully 3 mm. was attained. They hardly 

 taper at all at the ends, which are truncated. 



Their most peculiar external features are two. The first is the 

 colour. This, in specimens kept for some years in spirit, is a 

 delicate, salmony pink, somewhat resembling a freshly peeled pink 

 banana. I have never seen an Echinorhynchid with anything 

 approaching this colour. The second feature is the wrinkling. 

 This is very marked, and produces a very definite deepening of 

 the colour. The areas into which the wrinkles divide up the skin 

 become in the anterior end almost regularly quadrilateral, and a 

 quite peculiar marking is the result. This is well seen in 

 PI. XYI. fig. 3. 



The only specimen I sacrificed to the razor showed that these 

 wrinkles are the expression of deep narrow grooves which pene- 

 trate the subcuticle almost as far as the basement membrane. 

 Unfortunately the sections obtained did not clearly show the 

 nvimber of rings of hooks. They were not very nvimerous, perhaps 

 some 8 to 12. In each of the three specimens the proboscis was 

 retracted. 



Echinorhynchus xenopeltidis, n. sp. (Plate XVI. fig. 3.)'j 



Length varying from 15 to 25 mm. Average breadth 2*5 mm. 

 Plump forms with anteriorly many wrinkles, which showed a 

 tendency to break up the surface into squarish areas. Colour, a 

 delicate salmon- pink. Hooks in ? 8-12 rows. 



Habitat. Xenopeltis unicolor Reinw. Taken at Kwala Aring. 



ECHINORHYNCHVS TIGRINJE, n. sp. 



Two complete specimens and a fragment were taken from the 

 intestine of a Rana tigrina Daud. The former had a length of 

 10 mm. and an average breadth of 2 mm. They were of a slaty-grey 

 colour, and marked by transverse grooves at irregular intervals. 



The proboscis is very short and very small. It does riot emerge 



