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Show 922 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 29, supralabials, separated from orbital by a single row of infraorbitals. 10 infralabials. Temporal region covered with minute granules. Gular fan small ( $ ). Body scarcely compressed, covered with small smooth granular scales, those on the belly a little larger. Tail cylindric, not much longer than head and body, covered with elongate., slightly keeled scales. Limbs short, extended forwards, the extremity of longest finger reaches the nostril, and the extremity of longest toe the shoulder. Tibia two thirds the length of the head. Fingers and toes short, with well-developed dilatations. Light grey above (not bleached), with pure white spots and a dark-brown network ; tail encircled by complete dark-brown annuli. Beneath white, with a few dark spots. 2 (tail injured). Half-grown. Length from tip of snout to extremity of tail.. 0*113 0*089 Length of head to ear-opening 0*014 0*011 Length of body from ear-opening to vent .... 0*041 0*028 Length of tail 0058 0*050 Length of fore limb 0*0195 0*016 Length of hind limb 0*029 0*0215 Two specimens of this very distinct species have been recently obtained by the Royal Belgian Museum from M. A. Boucard, together with other Reptiles and Batrachians from Yucatan. Among these were several specimens of the highly interesting Triprion petasatus, Cope (Proc. Acad. N. S. Phil. 1866, p. 127), a Frog which does not appear to have reached European collections before. This Anolis is named in honour of my friend M. Leon Becker, 4t.h e Odinst itnhgeu iMshoeldl uBeslcgai apnr Aorcauchrneodl odgiusrti.n g the ' Lightning' and 'Porcupine' Expeditions, 1868-70. (Part IV.1) By J. G W Y N JEFFREYS, LL.D., F.R.S., F.Z.S. [Eeceived November 4, 1881.] (Plates LXX., LXXI.) CONCHIFERA {concluded). Family XVI. MACTRID.E. 1. A M P H I D E S M A CASTANEUM, Montagu. Donax castanea, Mont. Test. Brit. App. p. 573, t. 17. f. 2. A. castaneum, B. C. ii. p. 413, pi. viii. f. ] ; v. p. 188^ pi. xliii. 1 For Part I. see P. Z.S. 1878, p. 393; for Part II. see P.Z S 1879 D 558- for Part III. see P. Z. S. 1881, p. 093. 10,Wi P* °°6' |