10. PACHTCALAMUS. — 11. AGAMOBO]^. 471 



A;. Hgr. (ir,l-fl4). Algiers. Mr. Kemp [P.]. 



/, m. Ad. & hgr. (A. 140+ Algiers. 



12, 145+13), 



71-0. Ad. (A. 13G+15, 141 Tamesmida, Al- M. F. Lataste [P.]. 



+13). geria. 



10. PACHYCALAMUS. 



Pachycalamus, Gilnth. Proc. Zool. Soc. 1881, p. 461 ; Peters, Sitzh. 

 Bed. Ac. xxvi. 1882, p. 583. 



Nostril inferior, between two small nasals, on the side of the 

 large rostral ; three large upper head-shields. A ventral line, no 

 vertebral or lateral lines. Tail depressed, obtusely pointed. Prse- 

 anal pores. 



Socotra. 



1. Pachycalamus hrevis. 



Pachycalamus brevis, Giinth. I. c. 



Prsemaxillary teeth 3 ; maxillaries 3 — 3 ; mandibulars 6 — 6. 

 Head depressed, with truncate projecting snoi;t. Eostral large, 

 trapezoid, its posterior border largest, straight, in contact with 

 a pair of large prsefrontals ; a large frontal, angular anteriorly, 

 nearly as long as broad, with more or less distinct traces of median 

 division ; eye slightly distinct through the ocular ; a large prae- 

 ocular ; an infraocular; five upper labials, first very small, fourth 

 and fifth largest. Mental narrow, elongate, a little broader ante- 

 riorly ; chin-shields very small, median hexagonal ; three lower 

 labials, second largest. Body short, though less so than in Tro- 

 gonophis. One hundred and sixty-five to one hundred and seventy- 

 three annuli on the body, and nineteen or twenty on the tail ; on 

 the middle of the body an annulus contains forty-eight or fifty 

 segments. A well-marked ventral line, but no vertebral or lateral. 

 Anal segments six or eight. Four prteanal pores. Brown above ; 

 head and lower surfaces yellowish white. 



millim. 



Length to vent 198 



Tail 15 



Diameter of body 9*5 



Socotra. 



a-f. Ad. & yg. Socotra. Prof. J. B. Balfour [C.l. 



(Types.) 



11. AGAMODON. 



Agamodon, Peters, Sitzb. Berl. Ac, xxvi. 1882, p. 580. 



Nostril inferior, pierced in a nasal which unites with the first 

 labial ; rostral largo, followed by a single very large shield. A 



