﻿CRl'STAClvA MAi.ACOSTRACA. II. q. 



The antennnke (fig. 3 a| arc moderately .stout and con.sideral)l\- .shorter tlian the carapace. 

 First joint nearly a.s long as the other joints combined, scarcely or dislinctlv more than twice as long 

 as deep; second joint nearl\- 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 sette 

 .somewhat long. — Antennnke 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 carjuis, and the posterior margin of the protuberance reaches about 

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

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

 than twice as long as broad; hand unconnnonly 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 fi.xed 

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



Thoracic legs moderateh- slender; sixth joint about as long as or, especiall\- 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 si.xth, and the setae of moderate length. 



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

 has a well developed, oblique, triangular or distally obliquel\- cut, conspicuous proces.s. Sixth segment 

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

 with the seta; 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""", 

 of an ovigerous female (from vStat. 117) 1.4""", of an ovigerous female from Norway 1.3'""'. 



Subadult Male. Antennnke as usually considerabl\- thicker and the pleopods somewiiat 

 longer than in the female. 



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

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

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

 fourth and fifth joints each adorned with ver\- long sensorv filaments; sixth joint either conspicuously 

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

 bundle of sliorter sensory setce, and either a little longer or e\'en a little shorter than se\-euth joint, 

 which terminates in two strong seta." and a sensorx' hair. — .Antennie oul\ as long as the upper 

 margin of the two proximal antennular joints, terminating in an extremel\- long seta. 



Chelipeds (fig. 3) long and moderateh slender; carpus twice as long as deep. Chela con.siderahly 

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

 anterior nuirgin half as long again as the mo\al)le finger, which is slender, while the fixed finger is 

 broad at the base and its incisive margin extremel\- finely serrate, a feature vi.sible only under high 

 magnifying power. 



