18 EJIYSINSCULPTA. 



but elevated like a carina or ridge above the adjoining plates; the anterior 

 marginal is pentagonal, with its outer and anterior angle prolonged; all the others 

 are quadrilateral: those along the flanks are revolute and form a groove; the 

 ninth and tenth are convex, while the eleventh and twelfth are again revolute and 

 form a deep gutter; the posterior and external angles of the ninth, tenth and 

 eleventh are each prolonged, and give a subserrate appearance to the posterior 

 margin of the carapace. 



The sternum is oblong, full and entire in front, but deeply emarginate behind; 

 the gular plates are triangular, with their apices directed backwards, and project- 

 ing beyond the brachial at their external border; the brachial are also triangular, 

 with truncate apices; the thoracic are oblong, quadrilateral; the abdominal are 

 pentagonal, large and broad. The femoral plates are quadrilateral, very large, 

 and project beyond the subcaudal at their posterior and external angles; the 

 subcaudal are lozenge-shaped. The surfaces of all these, as well as the inferior 

 surface of the marginal plates, are marked with deep radiating and concentric 

 striae. Of the supplemental plates, the axillary is triangular, with its basis turned 

 backwards; the inguinal is quadrilateral and very small. 



The head is large, but elongated; the upper jaw emarginate in front, and the 

 lower furnished with a strong hook; the cutting edges of both are strong and sharp. 

 The nostrils are anterior, and near together. The eyes are large, with a black 

 pupil, and a dark brown iris, surrounded by a yellow circle. 



The anterior extremities are covered with scales, both before and behind, those 

 in front being the largest; there are five fingers, palmate, each furnished with a 

 short, strong, and slightly curved nail. The posterior extremities are rounded at 

 the thigh, but flattened at the leg and tarsus; there are five toes, fully palmate, 

 but four only are furnished with nails. The tail is long, thick at the root, but 

 soon becomes slender, and is covered with scales. 



Colour. The head is dusky above, lighter below, and speckled with red, or 



