23 



Stat. 189a. Sept. 12. Lat. 2°22'S., long. 126 46' E. Townet. 2 Mastigopus. 



Stat. 194—197. Sept. 15. Lat. i° 53'-5 — i°45'-3 S., long. 126 39— 12 7 °8'.3 E. Plankton. 3 



Mastigopus. 

 Stat. 203. Sept. 19. Lat. 3 32'.5 S., long. i24°is'.5E. HENSEN vertical net, from 1500 m. 



depth to surface. 8 specimens, 1 Mastigopus, 1 Acanthosoma. 

 Stat. 206 or 207. Sept. 21. Buton-strait. Surface. 3 Mastigopus. 

 Stat. 220. Nov. 1 — 3. Anchorage off Pasir Pandjang, west coast of Binongka. 27S m. Townet, 



surface. 1 Mastigoptis. 

 Stat. 225. Nov. S. 5700 m. N. 279 E. from Southpoint of South-Lucipara-island. 894 m. 



Horizontal cylinder. 1 young specimen, 1 Mastigopus. 

 Stat. 230. Nov. 14. Lat. 3°58'S., long. i28°2o'E. Hensen vertical net, from 2000 m. depth 



to surface. 7 specimens. 

 Stat. 245. Dec. 3. Lat. 4°i6.sS,, long. I30°I5'.8E. Townet. 7 specimens. 



a. Adult Specimens (PI. II, figs. 2a — 2k). — Closely allied and similar to S. Ed- 

 wardsii. The carapace is moderately compressed; its rostrum is rather short, directed forwards 

 and somewhat upwards, nearly obliquely triangular, acute and even acuminate, as the distal 

 part of both the upper and the lower margin is a little concave. The supra-orbital spines are 

 somewhat small, acute; the hepatic spines well developed. The gastro-hepatic groove is well 

 developed, the cervical groove not discernible. The eyes are somewhat small, scarcely depressed, 

 only a little broader than the stalk ; the stalk is rather long in proportion to the eyes, as the 

 outer margin of its distal joint is about half as long again as the eyes. The peduncles of the 

 antennulae are somewhat long; first joint moderately narrow with the distal half of the outer 

 margin convex ; second joint is rather slender, a little shorter than the third joint which is 

 slender, similar in both sexes and about as long as the first. The lower flagellum of the male 

 with its clasping organ is shown in fig. 26 from the outer side; a description is scarcely 

 needed, but it may be remarked that the very long, strong and much curved spiniform 

 process reaches about to the middle of the 6-jointed part of the flagellum beyond the base 

 of the process. The antennal squama reaches beyond the middle of third antennular joint; it 

 tapers considerably to the narrow end so that the terminal margin is quite short, while the 

 outer terminal spine is very distinct. Third pair of maxillipeds is very long, a little more than 

 twice as long as the carapace, somewhat more than two and a half times as long as first 

 thoracic legs and more than half as long again as third pair of thoracic legs; the four proximal 

 joints are much thickened, third and especially fourth joint besides depressed so that the latter 

 joint, seen from above, is considerably broader than visible on fig. 2c, and this joint has about 

 a dozen fine bristles of very different length along the inner margin (not visible on the figure) 

 and some five short bristles along the outer margin ; fifth and sixth joints are much depressed 

 — in reality compressed but turned so that they look as depressed — with the outer and 

 inner margins 'nearly parallel ; fifth joint has about its distal fourth cut off as a subjoint, its inner 

 margin has a number of fine bristles and three long, moderately slender spines, and on the 

 lower surface near the outer margin a smaller number of bristles. Sixth joint is divided into 

 4 subjoints, the two proximal distinctly longer than the two others, and the second a little 

 longer than the first, and each of the two distal subjoints is again subdivided into two joints 

 subequal in length; thus in all 6 subjoints are found. Sixth joint has 2 spines on the end, the 



