Dr. A. Giinther on Reptiles from St. CroiWj West Indies. 213 



middle of the length of the snout ; between these ridges is a 

 shallow groove, and another, narrower, between each ridge and 

 the canthus rostralis. There is a series of larger shields along 

 the superciliary margin and the ridge ; no other smaller shields 

 occur between the superciliary series, but many in and before the 

 central groove of the upper surface of the snout. The canthus 

 rostralis is formed by a series of elongate shields, angularly bent; 

 two shields between the latter series and that of the interior 

 ridge. The nostril opens laterally, between several small shields, 

 above the anterior extremity of the canthus rostralis. The can- 

 thus rostralis is continued along the outer margin of the roof of 

 the orbit, which is provided with a group of five or six polygonal 

 shields, surrounded by minute granulations. There is an ovoid 

 occipital shield in immediate contact with the suture between 

 the superciliary series, and surrounded by a great many smaller 

 shields. The loreal region is slightly concave, with five longi- 

 tudinal series of small oblong shields. The rostral shield has pos- 

 teriorly five notches (to receive five small shields), of which the 

 middle one is the deepest ; seven very narrow labials, with two or 

 three minute ones behind, form the lateral margin of the upper 

 jaw. The anterior extremity of the lower jaw is covered with 

 a pair of rather broad labials, its margin with seven narrow 

 shields ; three other series of smaller shields run parallel to that 

 of the labials. The chin and all the throat are covered with 

 very small granular scales. 



The tympanum is a rather small cleft, without any particular 

 scales round its margin ; the scales on the temple are exceed- 

 ingly small. 



Immediately behind the occipital shield commences the streak 

 of larger vertebral scales; they are arranged in two or three 

 series, and keeled like the other scales on the back. They gra- 

 dually become smaller towards the sides, in the middle of which 

 they form minute granulations. Those of the belly are distinctly 

 keeled, and larger than those of the back ; they are largest on 

 the sides of the pouch, where they are arranged in very oblique 

 series. The pouch is present in both sexes, but it forms a slight 

 fold only in the female. The scales round the vent do not show 

 any peculiarity, and are granular. 



The vertebral streak of scales is continued on the tail into a 

 low serrated crest, formed by a single series of scales. The tail 

 is slightly compressed and rounded beneath, verticillated ; the 

 single verticils are distant from each other for four scales of 

 the caudal crest, the fourth scale always being larger than the 

 three preceding ones. The sides of the tail are covered with 

 granular scales, whilst the scales of its lower surface are very 

 large and strongly keeled ; the root of the tail is slightly swollen 



