150 MR. A. E. SHIPLEY ON THE [June 16, 



Echinorhynchus patani, n. sp, (Plate XYI. figs. 9 & 10.) 

 Length 25 mm., breadth 2 mm., breadth of head 1 mm. Hooks 

 in 6 rings, perhaps 7 or 8, and in 12-14 longitudinal rows. The 

 hooks in one ring are opposite the interspaces in the next. The 

 2nd and 3rd rings composed of unusually large hooks. The worms 

 were folded twice with cysts some 10 mm. long by 5 mm. broad. 



Habitat. The body of an unknown snake, possibly Dipsado- 

 •morphus dendrophiVifjS Boie, taken at Patani, Lower Siam. 



EcHiNOBHYNCHUs BUFONis, xi. sp. (Plate XYI. figs. 1, 2, & 4.) 



Several specimens of what I regard as the same species of 

 Echinorhynchus were taken from the alimentary canal of two 

 species oiBufo obtained at Patani, which have been kindly identified 

 for me as Bufo melanostictus Schneider, and in all probability 

 Bufo penangensis Wilson & Gray, by Dr. Gadow. 



Bufo is known to harbour the comparatively widespread 

 Ech. hceruca, but I know of no other species of Echinorhynchus 

 parasitic in this amphibian, and as the parasites from Patani diifer 

 in many respects from any descriptions which are available, I 

 have established a new species. 



The worms fall into two groups. The larger, probably the females, 

 measure some 15 mm. ; the smaller, probably males, some 5 mm., 

 but there are many intermediate in length. The greatest 

 breadth of the larger specimens is 1*5 mm. As a rule their out- 

 line and surface is smooth, but some were -wrinkled either wholly 

 or in part. The body is usually curved, and in the larger specimens 

 markedly so. The most conspicuous feature in which this species 

 differs from the majority of its congeners is that the proboscis or 

 introvert is not median and terminal, but projects from the trunk 

 a little way, sometimes more, sometimes less, from the anterior 

 end; it usually slopes forward, but it may stand out at right 

 angles to the axis of the body like the handle of a wall^ing-stick 

 (PI. XYI. figs. 2 & 4). It is always protruded on the inner 

 surface of the curve. This feature and its divergence from the 

 more usual type are represented in the Gyphyrea, where Aspido- 

 siphon bears the same relation to most other Sipunculids that this 

 species does to other Echinorhynchi. 



The number of hooks is comparatively small, there being some 

 6-8 rings, alternately arranged with 14-16 longitudinal rows. The 

 rings being alternating, the number of hooks in each ring is half 

 the number of longitudinal rows. 



Echinorhynchus hufonis, n. sp. (Plate XYI. figs. 1, 2, & 4.) 

 Curved, with proboscis opening on the concave surface just 

 behind the anterior end of the body, which extends beyond the 

 point of emergence of the proboscis. Length 15 mm. or less ; a 

 number, probably males, only 5 mm. long. Pew hooks, 6-8 ; rings 

 with 7-8 hooks alternating with those of the next row. 



