22 CAKL BOVALLIUS, AMPH1PODA HYPEHIIDEA. 



The body is more slender than in the other species, the lateral parts of the pereional 

 segments are a little projecting just above the epimerals, forming a margo, which continues 

 over the pleonal segments. 



The head is robust, the divergent keels are more obtuse than in Tyro Sarsi. 



The eyes are comparatively large, consisting of about twenty ocelli. 



The first pair of antennte (PI. Ill, fig. 19 and 20) reach to the anterior margin of 

 the fifth pereional segment; the peduncle is scarcely thicker than the base of the fiagellum ; 

 it equals a seventh of the length of the fiagellum. The first joint of the fiagellum is 

 long, rapidly tapering, provided with three longitudinal, strongly serrated keels, and richly 

 beset with long clavate hairs on the inner side; the second and last joint of the fiagellum 

 is conical with one long hair at the tip; it is almost as long as a fifth of the first joint. 



The second pair of antennce; (PI. Ill, fig. 21) the basal joint is almost globular, 

 the two following increase in length. The fiagellum is multi-articulate. 



The pereion is long and comparatively narrow, the third segment is the longest, the 

 first the shortest; the last three pereional segments are a little longer than the two 

 preceding together. The lateral parts of the segments just above the articulation with 

 the epimerals are bent outwards almost at a right angle so as to form a rounded 

 prominent margo. 



The epimerals are long and narrow, rounded below. 



The branchial sacks are broader below, constricted above, attached to the epimerals 

 of the second to seventh pairs of pcreiopoda. 



The first pair of pereiopoda (PI. Ill, fig. 22); the femur is narrow, linear; the 

 tibia is a little longer than the genu, the posterior margin fringed with some short 

 unequal hairs. The carpus is about as long as the metacarpus, the hinder margin 

 undulated and provided with a few short hairs. The carpus and metacarpus are much 

 broader than in the other species. The lower anterior corner of the metacarpus 

 is produced into a triangular process on the anterior side of the dactylus, longer than half 

 the dactylus; it is provided with a stiff bristle at the tip; the hinder margin of the joint 

 is undulated, finely serrated, and carries 4 to 5 short -spines. This joint is more richly 

 filled with glandular matter than the preceding. The dactylus is feebly curved, thick at 

 the base, where it shows a large opening for the metacarpal glands; the hinder margin 

 is provided with a small accessory spine a little below the middle. (PI. Ill, fig. 23). 



The second pair (PL III, fig. 24); the carpus is shorter than the metacarpus, the 

 hinder margin straight, with two pairs of long hairs. The metacarpus has the triangular 

 process shorter than half the dactylus; the anterior margin of the joint is sharply serrated, 

 the posterior margin feebly undulated, beset with some few hairs; there are three sharp 

 teeth at the lower corner. The dactylus is a little more slender than in the preceding 

 pair. 



The third and fourth pairs (PI. Ill, fig. 25) are slender; the tibia and carpus are 

 equal in length, a little broader below. The metacarpus is shorter than the carpus, the 

 hinder margin beset with short, fine, hooked hairs. The dactylus is curved, slender, the 

 hinder margin beset with short spines. At the base of the dactylus there is a wide open- 

 ing for the metacarpal glands. (PI. Ill, fig. 26). 



