is half as long as the posterior, the anterior margin of which is only half as long as that of 

 the anterior tooth, so that the latter is more prominent laterally, larger. Posterior moiety of 

 lateral crest straight, entire, with obtuse, blunt, anterior extremity; a small tubercle occurs near 

 the posterior border of the carapace between the posterior extremities of the 3"^ and 4''' crest, 

 for the rest the branchial region is smooth above the lateral carina. All the tubercles 

 and carinae of the carapace show a corroded and eroded appearance. 



Abdomen moderately tuberculate and carinate. Median tooth of i^^' tergum rounded 

 anteriorly and transversely, shorter than anteriorly broad ; lateral teeth smaller, obtuse anteriorly 

 though not rounded; posteriorly the tergum bears at either side 4 tubercles in a transverse 

 row, of which the 1=^' or submedian, the 3'^'^ and the 4"> are small, granuliform, the 2'"' twice 

 as large. The pleuron of the i^' somite ends at its antero-inferior angle, in young specimens, in a 

 sharp tooth, which is directed forward, in older individuals the angle becomes obtuse; there are 

 4 rounded tubercles on the upper half of the pleuron near the anterior margin, of which the i^' or 

 uppermost is the largest, then follows the 3"', while the 2°'' and the 4'h are very small. On all the 

 following terga the median crest is distinctly notched and moderately prominent. 

 On the 2'"i tergum both parts are subequal in length, rounded above; between the rounded, 

 lateral tubercles on the boundary between tergum and pleuron and the circular anterior of the 

 median crest are situated 6 tubercles, one, the largest and nearly of the same size as the median 

 one, midway between the latter and the lateral tubercle; between this largest and the median 

 tubercle two smaller are situated behind one another and between the largest and the lateral 

 tubercle three, also behind one another, that decrease in size from the anterior to the posterior. 

 Between the oblong posterior tubercle of the median crest and the small lateral at the limit 

 between tergum and pleuron are placed, like on the i^' tergum, 4 tubercles in a transverse 

 row, of which the 2"'' is the largest, the three others small and granuliform, but sometimes 

 the i^' and the 2"'^ are coalesced. The median swelling of the 2°<i pleuron bears 4 not very 

 prominent, rounded tubercles that increase in size from the upper to the lower, often are the 

 two middle ones coalesced ; 4 or 5 small granules occur between the swelling and the anterior 

 margin, 2 or 3 between the swelling and the posterior border and the pleuron ends in two 

 spines, of which the anterior is twice as long as the posterior, while the antero-inferior angle 

 is obtuse. On the 3'^'^ tergum the posterior part of the median crest is a little longer than the 

 anterior and slightly compressed laterally, the tuberculation resembles for the rest that of the 

 2"*^; the swelling shows 5 rounded tubercles, that increase in size from the upper to the lower, 

 which at the antero-inferior extremity projects slightly like a blunt tooth ; 2 or 3 small granules 

 occur sometimes between the swelling and the posterior margin and the pleuron ends in two 

 spines, of which the anterior is one and a half as long as the posterior. ( )n the 4''' tergum 

 the posterior part of- the median crest is distinctly laterally compressed, 2'/j-times as long as 

 the anterior and its upper border is fluted longitudinally, the anterior part is also slightly 

 compressed ; the tuberculation of the anterior moiety of this tergum is nearly the same as in 

 the 2"^' and 3'''^, three smaller tubercles being situated behind one another near the lateral 

 tubercle that separates the tergum from the pleuron and two behind one another on each side 

 of the median tubercle; on each side of the posterior part of the median crest two tubercles 



