COPEPODA 



203 



teeth; the armature of the anterior and posterior surface is scarceh- different from that of S. globiceps. 

 The third 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 basipodite has a patch of strong 

 spines, wanting in the second pair. The four ffi pair of legs is distinctly granular on the anterior sur- 

 face, but has fairly 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 short spines are observed; on the posterior surface of the second inner segment a transverse 

 row of 8 long spines is found. The /^//'// /r^'^*/ agrees fairly well with Scott's and Farran's description, 

 but the articulation is very indistinct. 



The labrniii is comparatively slightly produced in front (PI. VII fig. 12 a). The arrangement of 

 setae on the anterior surface is rather characteristic; in front a median group of fairly long bristles, 

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

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

 ally partlv 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 lahruvi (PI. VII fig. 12 b) shows some 

 similarity to .S". validris^ and in a less degree to S. globiceps; 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 converging 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 "lamina labialis" . and upon the labial lobes, is very much 

 like that of S. globiceps. 



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 S/S Thor has collected three females of this species at the following stations: 



19/6 1904 St. 152 65°oo L. N. 28°io L. W. Yt. 1000 M. Wire. 



■V7 1904 St. 183 6i°30 L. N. i7°o8 L. W. Yt. 1800 M. Wire. 



Vg 1905 St. 167 57°47 L. N. ii°33 L. W. Yt. 1500 M. Wire. 



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

 gathering from 85 fathoms (5/^ 4°26 L. S. 10° L. E.), and from the west coast of Ireland "on four sta- 

 tions at depths of from 400 to 680 fathoms". 



Remarks. Though this species differs from that described by Scott by less robust shape, by 



4 for 5 amalliform setae of the maxillae, and by the slightly different shape of the fifth foot, it seems 



natural to regard the two as identical. It seems to be nearly related to S. obttisi/rons, but differs by a 



more robust shape, bv the structure of the third pair of legs, and by the longer antennulae. 



26* 



Text-fig. 64. 



Scaphocalanus robtisttis Th. Scott fQ. 



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



c. Pes I sin. X I35- 



