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Show 150 MR. A. E. SHIPLEY ON THE [June 16, Echinorhynchus patani, n. sp. (Plate XVI. 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 10mm. long by 5 m m . broad. Habitat. The body of an unknown snake, possibly Bipsado-morphus dendrophilus Boie, taken at Patani, Lower Siam. ECHINORHYNCHUS BUFONJS, n. sp. (Plate XVI. 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 of Bufo obtained at Patani, which have been kindly identified for me as Bufo melanostictus Schneider, and in all probability Bufo peuangensis Wilson & Gray, by Dr. Gadow. Bufo is known to harbour the comparatively widespread Ech. hcurnca, but I know of no other species of Echinorhynchus parasitic in this amphibian, and as the parasites from Patani differ 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 outline 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 walking-stick (PI. XVI. 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 bufonis, n. sp. (Plate XVI. 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 m m . or less ; a number, probably males, only 5 mm. long. Few hooks, 6-8 ; rings with 7-8 hooks alternating with those of the next row. |
