440 MR. J. R. HENDERSON— A CONTRIBUTION 



The L. lonffirostris, Y?iv.japomcus, of Ortmarm, which is distinguished by the form of 

 its telson and rostrum, is, I think, a distinct species, while the var. cariiiafus, of the 

 same author, from China, founded on the carination of the abdominal segments wliich 

 is seen in Milne-Edwards's species, may or may not be distinct. De Man (Notes Leyden 

 Museum, vol. iii. p. 141, 1881) describes the brancliiostegal spine as smaller than the 

 antennal spine in the Chinese examples which he referred to i. lon(/lrosfris, but this is 

 probably an error of descri])tion. 



Distribution. Sunderbunds {Ililne-Edwards) ; China {De Man, Ortniann). 



260. Leander tenuipes, n. sp. (PI. XL. figs. 14, 15.) 



Bombay, two imperfect specimens {Day) ; Gulf of Martaban, five specimens {Oates) ; 

 Madras, ten specimens {J. B. H.). 



The rostrum is slender, and exceeds the antennal scales by about half its length, with 

 the distal two thirds styliform and upturned ; the basal crest scarcely reaches the end of 

 the proximal antennal peduncular joint. The first lower rostral tooth is minute, and 

 placed under or in front of the distal tooth of the basal crest ; both the upper and lower 

 distal teeth are placed at some distance from the apex of the rostrum. The shortest of 

 the three antennular flagella does not reacli the end of the antennal scales. The spine on 

 the antennal scale is placed much nearer the apex than in L. longlrostris. The antennal 

 spine is minute, but the branchiostegal one is well developed. 



The first pair of legs are slightly longer than the antennal scales. The second legs have 

 the merus more than twice the length of the ischium, and the former joint is proximally 

 compressed, with an ill-defined sulcus on the upper surface, but its distal half is narrow 

 and less compressed ; the carpus is about equal in length to the ischium, while the palm, 

 which is slightly dilated and smooth, is a little longer than the carpus. The fingers are 

 nearly twice the length of the palm, but otherwise similar to those of L. longirostris. 

 The remaining feet are extremely long and slender, more especially due to a lengthening 

 of their terminal joints, which are more slender than even the antennal and antennular 

 flagella ; they increase in length on passing back, the last pair being longest. It is 

 impossible to give accurate measurements of these legs, as in most cases they appear 

 to be imperfect. This extraordinary lengthening is not confined to the legs, but is 

 seen also in the antennal and antennular flagella, which are certainly more than twice 

 the length of the body. The last three abdominal segments are strongly compressed 

 laterally, and narrowed al)0ve but not cariuated. The telson is smooth and rounded 

 dorsally, except for the jiresence of a shallow sulcus towards the apex ; the apex is blunt, 

 and not produced to the level of the spine on the exopodites of the last appendages, Avith 

 the subterminal pair of spinules considerably longer than the free end of the telson. 



The colour noted in fresh specimens is grey, with the thoracic viscera presenting an orange 

 hue under tlie carapace, and the attached or fertilized ova in the female yellowish green. 



A Madras specimen, measured like the last species, is 55 mm. long, the rostrum 

 19 mm., the second leg 36 mm., and the last leg 75 mm. Although the dactylus of the 

 last leg in this example is broken at the tip, it still measures 15 mm. in length. 



