CUMACEA FROM THE COPENHAGEN MUSEUM. 15 



Cyclaspis cingulata, sp. n. (Plate IV^ figs. 1-10. ; 



Beso'iption of immature Female. — Total length 4*2 mm. 



The carapace is about two-fifths of the total length, somewhat compressed, its dorsal 

 surface as seen from the side strongly arched, and its posterior margin sloping back- 

 wards so as to conceal more or less the first two thoracic somites when viewed from 

 above. It is encircled by a very prominent ridge or collar, which crosses the dorsal 

 surface a little in front of the middle of its length and slopes a little forwards as it 

 passes down each side. In the raid-dorsal line this collar is interrupted by a deep 

 notch. On the dorsal surface of the carapace in the posterior third of its length is a 

 pair of ridges, slightly diverging and becoming more strongly marked posteriorly and 

 bearing a few scattered setae. External to and below the frontal fissure on each side 

 is a slight prominence. The pseudorostrum is short, horizontal, and the long, narrow, 

 ocular lobe extends quite to the tip, projecting in front of the lateral lobes. The 

 corneal lenses are 11 in number and are grouped on the distal end of the ocular lobe. 

 The antennal notch is small, and the antennal tooth is well behind the tip of the 

 pseudorostrum. 



The first leg-bearing somite is well exposed, the fourth and fifth have well-marked 

 dorso-lateral keels, and the fifth has also a slight median keel. The abdomen is about 

 equal in length to the cephalothoracic region and rather stout. All the abdominal 

 somites except the last have strong dorso-lateral keels. The first four have a well- 

 marked dorsal keel which becomes faint on the fifth. 



The anteunule has the third segment of the peduncle longer than the second, the 

 first about equal to the other two together. The vestigial inner flagellum is very 

 distinct. The antenna appears to lack the external process. 



The third maxilliped has the basis little longer than the distal segments together. 

 Its distal process is very long, reaching nearly to the end of the carpus. 



The first leg is long, extending beyond the end of the pseudorostium in the natural 

 position by nearly the length of the last two segments. The basis is about four-fifths 

 of the length of tlie distal segments together, and is a little produced on the lower 

 side of the following segment. The remaining legs are rather short and stout. In 

 the second pair the basis is less than two-thirds the length of the distal segments 

 together. 



The peduncle of the luropods is distinctly shorter than the last somite and has a 

 single small seta on its inner edge. The endopod is a little longer than the peduncle 

 and distinctly longer than the exopod, tapering to a sharp point, and with three small 

 spines about the middle of its inner edge. The exopod has an apical spine and a few 

 very small sette on its outer and inner margins. 



Male. — A single adult male, which may possibly belong to this species, is unfortu- 

 nately so much damaged that it cannot be described in detail. It agrees with the 



