i'5 



antepenultimate joint, wliilc the terminal joint is short and furnished with setae, and the penul- 

 timate joint has three strong setse on the posterior (lower) margin and the first of these near 

 the middle of the joint. When these legs are lost, the species is distinguished by the shape of 

 the rostrum and the eyes, by the antennuloe, the rather broad antennal squama and the very 

 conspicuous dorsal crest on the carapace. The species is somewhat similar to very young 

 specimens of 5. abbreviatum G. O. Sars, but the latter species has real chelae, a narrower and 

 longer antennal squama, etc. In vain I have attempted to separate the specimens from the Indian 

 Archipelago, the Pacific and the Atlantic into two or more species: all belong to the same species. 



b. Species with the elongated pair of legs terminating in false chelae, 

 ha ving no real immovable finger but a very long and strong terminal, 

 d i s t a 1 1 y curved s p i n e (and near t h i s two shorter s p i n e s) on the penul- 

 timate joint. (This division of the genus may be named the /ongicome-group). 



20. Stylocheiron insulare n. sp. PI. XVI, figs. 2 a — 21. 



Stat. 118. July 13. Lat. i°38'N., long. I24°28'.2E. HENSEN vertical net, from 900 m. to 



surface. 2 specimens (male and female). 

 Stat. 141. August 5. Lat. i°o'.4S., long. I27°25'.3E. 1950 m. HENSEN vertical net, from 



1500 m. to surface. 1 female. 

 Stat. 143. August 7. Lat. i°4'.5 S., long. I27°52'.6E. 1454 m. HENSEN vertical net, from 



1000 m. to surface. 1 female. 

 Stat. 185. September 12. Lat. 3°2o'S., long. I27°22'.9E. HENSEN vertical net, from 1536 m. 



to surface. 2 males. 

 Stat. 203. September 19. Lat. 3°32'.5S., long. I24°I5'.5 E. HENSEN vertical net, from 1500 m. 



to surface. 1 female. 

 Stat. 220. November 1/3. Anchorage off Pasir Pandjang, West coast of Binongka. 278 m. 



Townet. 1 small specimen. 

 Stat. 243. December 2. Lat. 4°3o'.2S., long. I29°25'E. HENSEN vertical net, from 1000 m. 



to surface. 2 specimens (1 male and 1 immature female). 



Description. — The frontal plate is rather long, in the female (fig. 2b) produced 

 into a long, proximally moderately broad, distally thin rostrum ; in the male the rostrum is 

 about as long as in the female but somewhat more slender (fig. 2 a). The keel on the gastric 

 area is not high but yet very distinct, with the anterior part of the upper margin extremely 

 sloping. The eyes (fig. 2c) are moderately large, from one-fourth to nearly half as high again 

 as broad, broadly pyriform, with the longer lower part between two and three times as broad 

 as the upper near the end, which, seen from the side, terminates in a row of about 5 facets-, 

 the lower part is black excepting its outer layer. In the female the antennular peduncles are 

 distinctly shorter than in the next species, a little shorter than the carapace with rostrum, their 

 third joint about half as long again as the second; both flagella are extremely thin, the upper 

 fiagellum is somewhat shorter than the lower which is about as long as the peduncle. In the 

 male (fig. 2 a) the two distal peduncular joints are considerably shorter and thicker than in the 

 three following species; the upper fiagellum is distinctly longer than the peduncle and somewhat 

 shorter than the lower; both flagella are 7-jointed, with the distal half conspicuously expanded, 



