280 



they are situated not far from one another on the middle longitudinal third part of the sides. 

 The r' or uppermost carina terminates anteriorly in a spine, placed immediately behind the 

 level of the gastric spine ; this carina, that runs at the level of the orbital spine, is sharp, runs 

 backward at first straight, then slightly outward or already from the spine slightly outward and 

 backward, as far as the middle of the carapace, until the shallow cervical groove, that separates 

 the laro-e gastric from the branchial region. Immediately behind the posterior extremity of this 

 carina, but a little more outward and separated from it by the cervical groove, begins the 2" d 

 carina, that forms the boundary between the cardiac and branchial regions: the anterior half 

 is rather obtuse and curves inward, while the sharp posterior half runs straight backward to 

 near the posterior border of the carapace; the i st and 2 nd carina may also be considered as 

 one single crest, which is interrupted by the cervical groove. The 3 rd terminates anteriorly in 

 the hepatic spine, placed a little before the level of the gastric; this carina that runs just above 

 the level of the antennal spine, in a lateral aspect of the carapace, is also sharp and extends 

 nearly as far backward as the i st , but in the full-grown specimen from Stat. 273 it appears 

 posteriorly rounded transversely. The 4 th carina, which, like also the 5 th , is sharp and straight, 

 runs, midway between the latter and the posterior half of the 2 nd , to near the posterior border 

 of the carapace; it runs on the level of the hepatic or 3 rd crest, from which it is separated 

 by a broad interspace. The 5 th or undermost carina ends anteriorly in a spine, that is smaller 

 than the two other lateral and than the gastric spine ; this carina, placed on the level of the 

 antennal spine, is the longest of all, begins at the cervical groove just before the middle of 

 the carapace, whèn measured between the base of the rostrum and the posterior margin, and 

 terminates near the latter. The carapace is a little less high than broad ; the strongly curved 

 and marginated lower border ends anteriorly in a small, acute, branchiostegal spine, which is 

 hardly half as long as the antennal spine, below which it occurs. 



The abdomen, which, telson included, is 3-times as long as the carapace, resembles 

 closely that of Pont. incisus Kemp, both as regards the terga and the pleura, because they 

 are sculptured and carinated after the same pattern. The telson which is but little longer 

 than one-sixth the entire length, being in the adult female from Stat. 273 3,2 mm. long, is 

 faintly grooved ; it is rather narrow and tapers considerably backward, the breadth of the 

 tip being only about one-fourth the breaclth at the base; the anterior pair of dorso-lateral 

 spinules is implantecl at the posterior third, the posterior one and a half as far distant from 

 the apex as from the anterior pair. The triangular tip (Fig. 67 c) is but little longer than 

 broad at base and armed at either side of the acute extremity with 3 spines; the outer spine, 

 at the posterior extremity of the lateral borders of the telson, is very small, 0,04 mm. long, 

 hardly one-fourth the breadth of the tip; the two other spines, that are feathered, are very 

 long, 3 to 4-times as long as the triangular tip is broad, are of equal length and reach 

 considerably beyond the acute extremity. Inner uropods narrow, reaching to the apex of the 

 telson, outer much shorter. 



Hyes large, proportion between the greatest diameter of the corneal portion to the length 

 of the carapace, rostrum included, as 1 15,6; the eyes are of a dark slate colour, distinctly 

 and finely faceted, reniform and bear, like in Pont. incisus, a small acute tubercle above. 



