CRUSTACEA MALACOSTRACA. II 



io 5 



half of the third thoracic segment, considerably longer than broad (fig. 5b), at the front end somewhat 

 more than half as broad as behind the middle; the lateral margins posteriori)' somewhat convex, 

 anteriorly a little concave. 



Antennulte (figs. 5b and 5d) nearly as long as the carapace, moderately strong. First joint 

 slightly longer than the two next joints combined, somewhat more than twice as long as deep, some- 

 what produced above and before the middle considerably deeper than towards the end. Second joint 

 extremely produced above, increasing in depth from the base to the end of the lower margin and its 

 upper margin is nearly two-thirds as long as that of the first joint. Third joint considerably tapering, 

 with the lower margin about twice as long as the upper; fourth joint slenderly conical, a little longer 

 than the lower margin of third joint, considerably shorter than its terminal setae. — Antennae short, 

 even a little shorter than the two proximal antennular joints combined; fourth and fifth joints com- 

 pletely fused. 



Chelipeds (fig. 5 g) somewhat robust. The basal joint even a little longer than the carpus, 

 with the posterior protuberance large, as long as deep and its rounded hind margin reaching behind 

 the anterior lower end of second thoracic segment. Carpus nearly ovate, slightly more than half as 

 long again as deep. Chela a little longer than the carpus, about twice as long as broad, with the 

 major part of its posterior margin straight and furnished with two long setae; movable finger almost 

 as long as the anterior margin of the hand and towards the base much narrower than the fixed finger. 



Lateral margins of the thoracic segments (fig. 5 a) not angular but evenly and moderately 

 convex. Second segment somewhat shorter than the third which is slightly shorter than the fifth or 

 the sixth. — Thoracic legs short. The two anterior pairs uncommonly thick (fig. 5g); third joint with 

 a very long, spiniform seta from the posterior angle; fourth and fifth joints very thick; subequal in, 

 length and with the terminal spines long or rather long; sixth joint considerably longer than the 

 fifth and slightly longer than seventh with claw. Three posterior pairs somewhat slender (fig. 5 e) 

 with their spines well developed; fifth joint even longer than the sixth and slightly longer than 

 seventh without claw. 



Abdomen a little shorter than the two preceding segments combined. Five anterior segments 

 (fig. 5 f ) with the ventral margin moderately convex; pleopods wanting. Sixth segment (fig. 5c) scarcely 

 as long as the two preceding segments combined, transverse, with the hind margin long and a little 

 concave. — Uropods, inserted on the postero-lateral angles which are cut off obliquely, are only a 

 little shorter than the five posterior segments combined and somewhat robust; the peduncle as long 

 as the sixth segment, seen from the side (fig. 5f) curved a little downwards, with the lower margin 

 concave; endopod curved downwards as the peduncle, almost thicker a little from the end than near 

 the base, two-jointed, with the second joint more than twice as long as the first; exopod slender, as 

 long as the first joint of the endopod, one-jointed. 



Length of a female without marsupium 2 mm . 



Subadult Male. Similar to the female in most features, but differing in some particulars. 



— The antennulae (fig- 5g), especially their two proximal joints, somewhat thicker than in the female. 



— Three posterior pairs of legs (fig. 5I1) have the seventh joint and the claw considerably longer 

 than in the female, subequal in length and together twice as long as sixth joint. — Abdomen (fig. 5 i) 



The Ingolf-ExpeJilion. III. 5. J 4 



