CRUSTACEA MALACOSTRACA. II. 



I0 7 



Antennulae somewhat long in proportion to the animal (fig. i a), being somewhat more than 

 half as long as the carapace and rather slender (fig. ib). First joint somewhat shorter than the other 

 joints combined, slightly more than twice as long as deep and a little more than twice as long as the 

 second which is not produced above; third joint a little longer than deep, rectangular and consider- 

 ably shorter than the second; fourth joint uncommonly long, as long as second and third joints com- 

 bined, slender; longest terminal seta nearly as long as the three distal joints combined. Antennae 

 with fourth and fifth joints completely fused without any vestige of an articulation, about twice as 

 long as the penultimate joint. 



Chelipeds (figs, i b and i c) somewhat large and moderately strong. Basal joint posteriorly 

 produced into a considerable free portion bent much upwards and reaching distinctly behind the cara- 

 pace. Carpus somewhat less than twice as long as deep, nearly oblong-ovate, with the lower margin 

 considerably convex. Chela somewhat longer than the carpus, long and somewhat slender, being a 

 little less than three times as long as broad, with two long setae near the middle of the concave 

 posterior margin and with the hand distinctly narrower at the base of the movable finger than near 

 the middle; movable finger considerably or rather much shorter than the anterior margin of the hand, 

 only a little narrower than the fixed finger (fig. i c), the incisive margin of which is somewhat sinuate, 

 showing two flatly vaulted and badly defined protuberances. 



Thoracic segments (fig. la) with their lateral margins very convex, producing deep incisions 

 between the segments; some of them are subangular. Second to fourth segment short, increasing in 

 length backwards, together about as long as the sum of the fifth and the sixth; second segment de- 

 creases considerably in breadth from near the front to the posterior end; third segment is broadest 

 somewhat before, and fourth a little before, the middle, while the three posterior segments are broadest 

 behind their middle. Fifth segment is almost broader than the second and somewhat broader than 

 the fourth or the seventh. - - Thoracic legs (figs, ib and id) long and slender; the anterior pair have 

 the joints from the fourth to the sixth somewhat increasing in length, and the sixth joint, which is 

 slender and long, is a little longer than seventh with claw. Posterior pairs (fig. id) have the spines 

 of moderate length; sixth joint is very long and considerably or much longer than seventh with claw. 



Abdomen somewhat longer than the two preceding segments combined (fig. i a), seen from 

 above tapering considerably backwards to the posterior margin which has a very obtuse angle; four 

 posterior segments each with a pair of sublateral setae (figs. la and ic). Ventral side of the five 

 anterior segments (figs, ic and if) strongly serrate, as each segment bears a high, subtriangular or 

 subquadrangular protuberance. Pleopods generally small and their rami terminating in some moder- 

 ately long setae (fig. ie); in the largest specimens from the "Ingolf" Stat. 25 the pleopods are very 

 small (fig. if) and their setae nearly rudimentary. Sixth segment longer than the two preceding seg- 

 ments combined. Uropods small; peduncle short and much deeper than long, thick; the endopod 

 with its two joints equal in length; exopod more than half as long as the endopod, more or less di- 

 stinctly two-jointed, with the joints subequal in length. 



Length of females with marsupium 1.67 2 mm . 



Subadult Male. Conspicuously more slender and distinctly smaller than adult females. 

 Antennulee (fig. ig) considerably thicker than in the female; first joint somewhat less than twice as 



14' 



