CRUSTACEA MAI.ACOSTRACA. II. 



93 



The antennulse (fig. 3 a) are moderately stout and considerably shorter than the carapace. 

 First joint nearly as long as the other joints combined, scarcely or distinctly more than twice as long 

 as deep; second joint nearly half as long as the first and considerably produced above; third joint 

 with its upper margin very short; fourth joint a little shorter than second, with its terminal setae 

 somewhat long. — Antennulae with the articulation between fourth and fifth joint indistinct or moder- 

 ately distinct. 



Chelipeds somewhat long and moderately slender (fig. 3 a). Basal joint normal, somewhat long 

 but yet somewhat shorter than the carpus, and the posterior margin of the protuberance reaches about 

 the front angle of second thoracic segment. Carpus slightly or scarcely more than twice as long as 

 deep, with its lower margin almost straight. Chela scarcely as long as the carpus, somewhat more 

 than twice as long as broad; hand uncommonly long, with the anterior margin almost half as long 

 again as the movable finger and with only a single seta at the hind margin at the base of the fixed 

 finger, which has at least the distal tooth of the incisive margin triangular and well developed. 



Thoracic legs moderately slender; sixth joint about as long as or, especially in the posterior 

 pairs, a little longer than seventh with claw. Second (fig. 3 a) and third pairs have the fifth joint at 

 least not longer than the fourth but much shorter than the sixth, and the setae of moderate length. 



Abdomen (figs. 3b and 3 c) has the ventral margin serrate, as each of the five anterior segments 

 has a well developed, oblique, triangular or distally obliquely cut, conspicuous process. Sixth segment 

 not fully as long as the sum of the three preceding segments. Pleopods somewhat short and broad, 

 with the setae well developed and some of these longer than the rami. - - Uropods short, in smaller 

 specimens somewhat, in large specimens considerably or much, shorter than the last segment; endopod 

 with first joint conspicuously shorter than, or about as long as, the second; exopod a little or some- 

 what shorter than the endopod. 



Length of one of the largest specimens without marsupium (from the "Ingolf" Stat. 38) 1.8 n " n , 

 of an ovigerous female (from Stat. 117) 1.4""", of an ovigerous female from Norway 1.3 mm . 



Subadult Male. Antennulse as usually considerably thicker and the pleopods somewhat 

 longer than in the female. 



Adult Male (figs. 3d — 3g). Antenuulee 7-jointed; the two proximal joints very thick and the 

 upper margin of first joint about half as long again as that of the second; third and fifth joints quite 

 short, fourth joint extremely short, these three joints taken together not quite as long as the second; 

 fourth and fifth joints each adorned with very long sensory filaments; sixth joint either conspicuously 

 longer than, or only as long as, the three preceding joints combined, at the lower distal angle with a 

 bundle of shorter sensory setae, and either a little longer or even a little shorter than seventh joint, 

 which terminates in two strong setae and a sensory hair. — Antennae only as long as the upper 

 margin of the two proximal autennular joints, terminating in an extremely long seta. 



Chelipeds (fig. 3) long and moderately slender; carpus twice as long as deep. Chela considerably 

 longer than the carpus, somewhat less than three times as long as broad; hand elongate, with the 

 anterior margin half as long again as the movable finger, which is slender, while the fixed finger is 

 broad at the base and its incisive margin extremely finely serrate, a feature visible only under high 

 magnifying power. 



