﻿COPHPODA 



203 



teeth; the annature of the anterior and posterior surface is scarcely different from that of S. o/obiccps. 

 The fhird pair of legs is like those of the preceding species, but the outer-edge spinous lamina of the 

 second basipodite is wanting, and the posterior surface of the third basiiDodite has a patcii of strong 

 spines, wanting in the second pair. The /('//■r/// pair of legs is distinctly granular on the anterior sur- 

 face, but has fairl\- long spines in a longitudinal area on the two inner segments in addition to the 

 granulation; on the posterior surface of the two distal outer segments as well as on the distal inner one 

 a few sliort spines are observed; on the posterior surface of the second inner segment a transverse 

 row of 8 long spines is found. The A/?// /wV agrees fairly well with Scott's and Farran's descrii^tion, 

 but the articulation is very indistinct. 



The labnini is comparati\'eIy slightly produced in front il'l. VII fig. 12 a). Tlic arrangement of 

 setae on the tuitcrior surface is rather characteristic; in front a median group of fairi\- long bristles, 

 3 — 4 deep continued into a lateral group of a number of shorter hairs, extending lateralh' to in front of 

 a posterior lateral group of densely placed hairs. In the middle, later- 

 all\- partly fused with mentioned anterior group, a transverse series 

 of comparatively few short setae. Add to this a marginal group of nu- 

 merous bristles. 



The oral surface of the labntiu (PI. \'II fig. 12 b) shows some 

 similarity to .5'. va/idiis, and in a less degree to S. globicips; the granular 

 area around the first median circular spot is only small; the lateral 

 marginal and the first lateral group form a fairly long oblique group, 

 medially consisting of granules, and con\erging towards the second 

 median circular spot; the following lateral groups are in the main like 

 the structures in the preceding species. The arrangement of setae 

 around the ■•laiiuita /abialis". and U])ou the labial lobes, is ver\' much 

 like that of .S'. globiccps. 



Variation. In the first right foot in one of the specimens a median outer-edge seta was ob- 

 served in the third outer segment. 



Occurrence. The vS'S Thor has collected three females of this species at the following stations: 



'9/,, 1904 vSt. 152 65''oo L. N. 28°io L. \V. Yt. 1000 AI. Wire. 



'V; 1904 vSt. 183 6i°30 L.N. i7°o8 L. W. Vt. 1800 M. Wire. 



i/o 1905 St. 167 57°47 L.N. ri\^3 L. \\'. Vt. 1500 M. Wire. 



Distribution. This .species has only been recorded twice, namely from the (lulf of (Guinea in a 

 gathering from 85 fathoms (-^ 4°26 1<. S. 10° L. E.), and from the west coast of Ireland "on four sta- 

 tions at depths of from 400 to 680 fathoms". 



Remarlcs. Though this sjiecies differs from that described bv Scott by le.ss robust shape, by 

 4 for 5 amalliform setae of the maxillae, and b\- the slightly different shape ol the fifth foot, it .seems 

 natural to regard the two as identical. It seems to be nearly related to S. obfnsijrous.h\\\ differs bv a 

 more robust shape, b\ the structure of the third ])air of legs, and by the longer antenuulae. 



26* 



Text-fig. 64. 



Scaphocalaiius robushts Th. Scotl f9- 



a. Head X 18. b. genital somite X iS. 



c. Pes I sin. X I35- 



