456 AMPHISB^NIT)^. 



3. Monopeltis welwitscMi. (Plate XXIV. fig. 2.) 



Dalophia welwitscliii, Gray, Cat. Sh. Hept. ii. p. 41. 

 Dalophia welwitscliii, Grai/, Proc. Zool. Soc. 1865, p. 454, fig. 



Eostral very small, triangular, with truncate anterior angle, the 

 inner angles of the nasals shortly separated ; a single plate covering 

 the head, with a short suture in front of the ocular, which is small : 

 63*6 not distinguishahle ; a pair of band-like occipitals ; three upper 

 labials, third large ; mental small, quadrangular, followed by a larger 

 pentagonal chin-shield ; three lower labials, first and second small, 

 third very large. Two hundred and seventy-one or two hundred and 

 seventy-five anuuli on the body and twenty-two or twenty-three on 

 the tail ; on the middle of the body an annulus comprises thirty- 

 four segments, twenty above and fourteen below the lateral lines ; 

 the dorsal segments much longer than broad, the two median ventrals 

 much broader than long in the posterior part of the body. Pectoral 

 shields six, large, very elongate, the median pair widening a little 

 posteriorly, forming an angle anteriorly; its length equals the 

 distance between the posterior edge of the occipitals and the end of 

 the snout. Lateral line distinct. Anal segments six. No proeanal 

 pores. Colourless, head-shields yellow. 



ruilHm. 



Length to vent 265 



TaiL 24 



Diameter of body 6 



Angola. 

 a-h. Ad. Pungo Andoiigo. Mr. Welwitsch [C.]. (Types.) 



4. Monopeltis guentheri. (Plate XXIY. fig. 3.) 



Prgemaxillary tooth 1 ; maxillarics 2 — 2 ; mandibulars 6 — 6. 

 Snout acuminate. R'stral pentagonal, widely separating the nasals ; 

 a single shield covering the head, with a short suture from above a 

 prajocular, which is larger than the small ocular ; eye scarcely dis- 

 tinguishable ; a pair of band-like occipitals ; three upper labials, 

 first smallest, second longest, third deepest ; mental small, quadran- 

 gular, followed by a larger, heptagonal chin-shield ; three lower 

 labials, first and second small, third very large. Two hundred and 

 fifty to two hundred and fifty-four annuli on the body ; an annulus 

 on the middle of the body comprises twenty-eight or thirty-two 

 segments, sixteen or eighteen above and twelve or fourteen below 

 the lateral lines ; the dorsal segments much longer than broad, the 

 two median ventrals much broader than long, especially in the pos- 

 terior part of the body, where they are nearly or quite twice as 

 broad as long. Pectoral shields six, large, very elongate, of equal 

 width throughout their length, the inner pair slightly longer than 

 the outer, and forming an angle anteriorly ; its length equals the 

 distance between the posterior border of the occipitals and the end 



