154 MR. F. E. BEDDARD ON A [Feb. 15, Snakes : Typhlops reticulaius, L. ; Geophis lineatus, D. ik B. ; Elaps lemiiiscatus, L. Batrachians : Leptudaetylus pentadactylus, Laur. ; JBufo marinus, L. ; Bufo typhonius, L. ; Ccecilia gracilis, L. GONATODES ANNULARIS, Sp. n. (Woodcut, p. 153.) Closely allied to G. albogularis, D. & B. Snout longer than the diameter of the orbit, obtuse, the granules on its upper surface small, not larger than the dorsals. Supraciliary edge with a small projecting spine, as in most species of Sphcerodactylus. Seven upper and four or five lower labials ; a pair of small chin-shields behind the mental. No transversely enlarged subcaudals. Grey-brown above, with a series of large black spots along each side of the vertebral zone ; head and limbs with black spots or marblings ; tail with black annuli, alternating with white spots inferiorly ; lower surfaces pale brown, throat w ith oblique dark-brown lines converging backwards. millim. Total length 86 Head 11 Width of head 7 Body 29 Fore limb 15 Hind limb 19 Tail 46 Two female specimens. 5. On the Structure of a new Genus of Lumbricidse [Thamnodrilus guliehni^). By Frank E. Beddard, M.A,, r.R.S.E.^ Prosector to the Society, Lecturer on Biology at Guy^s Hospital. [Keceived February 15, 1887.] I owe the specimens of the worm described in the present paper to the kindness of Mr, W. L. Sclater, F.Z.S., who collected them for me during his recent visit to British Guiana. They are all rather large worms (see woodcut, fig. 1), measuring up to 6 inches in length and g inch in breadth, and belong to a new genus and species of Lumbricidse, which I propose to call Thamno-drilus GULTELMI. External Characters. — The colour is purplish on the dorsal and reddish yellow on the ventral side ; the clitellum is distin-guished from the rest of the body by its paler tint. The mouth is situated precisely at the anterior extremity of the ^ Named after Mr. William Lutlej Sclater.