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Show 1899.] AND BATRACHIANS FROM EOKIEN. 161 Lower jaw of Ophisaurus harti, much enlarged. In its dentition this species may be regarded as intermediate between Anguis fragilis and Ophisaurus gracilis. It differs from the latter in the presence of two scales between the rostral and the anterior prefrontal, instead of three, the still smaller ear-opening, and the greater number of longitudinal series of dorsal scales. The coloration is highly suggestive of affinity to our European Slow-worm, the teeth of Avhich have been shown by Leydig to be slightly furrowed. There is absolute identity, in shape and number, between the head-shields of this species and those of Anguis fragilis. 4. TACHYDROMUS SEPTENTRIONALIS Gthr. 16 specimens. I now agree with Dr. Giinther as to the advisability of separating T. septentrionalis from T. tachydromoides, Schleg. (cf Giinther Ann. & Mag. N. H. [6] i. 1888, p. 166). All the specimens have a single inguinal pore, the number of these pores being variable in T. sexlineatus, 4 specimens out of 7 from Great Natuna Id. having a single pore instead of two (cf. Giinther, Nov. Zool. ii. 1895, p. 499). The number of chin-shields is three, although there are occasional exceptions, not due to fusion or accidental division, as shown by the figure (p. 162) taken from one of the Kuatun specimens. The dorsal scales sometimes form 5 series instead of 6, and in one specimen they are even in 4 series on the posterior part of the back. TAVO of the specimens have the additional series of small scales between the outer pair of PROC. ZOOL. Soc-1899, No. X L 11 |