26 



still only with 3 spines on that margin, while the 3 slender spines on the basipodite are already 

 developed. Legs of the 4 th pair as in the adult. Merus 0,64 mm. long, 0,27 mm. broad, with 

 2 spines on the middle of the anterior margin, carpus long 0,52 mm. and 0,21 mm. wide, of 

 the 4 spines on the distal margin only the two posterior are present; propodus 0,4 mm. long, 

 0,18 mm. broad, dactylus 0,34 mm. long. The exopodite reaches almost to the end of the ischium. 

 Legs of the 5 th pair like in the adult. The exopodite reaches to the middle of the ischium. 



As the tricarinate form of the carapace of this species was not yet described by any 

 author, we may assume that only the male has hitherto been observed. 



The species, described by Spence Bate (Report Challenger Macrura) under the name 

 of Lept. robusta, is evidently another, at fïrst sight distinguished by the spiniform outer angle 

 of the orbits. As regards Lept. aculeocaudata Paulson of the Red Sea, Dr. Balss may be right 

 when considering this form as identical with Lept. robusta Stimps. 



General distribution: Chinese Sea (Stimpson); Loo Choo Islands (Stimpson); 

 Hawaiian Islands (Rathbun); Haddumati Atoll, Maldive Islands (Borradaile) ; Red Sea (Balss). 



2. Leptoehela pugnax de Man. PI. IV, Fig. 8 — Srf. 



Leptochela pugnax J. G. de Man, in: Zoolog. Mededeelingen, uitgegeven vanwege 's Rijks 

 Museum van Natuurlijke Historie te Leiden. Deel II, 1916, p. 148. 

 \Leptochela robusta C. Spence Bate, Report Challenger Macrura, 1888, p. 862, PI. CXXXIX, 

 figs- 3- 4- 



Stat. 4. March 9. 7°42'S., H4°i2'.6E. Anchorage off Djangkar (Java). 9 m. Bottom coarse 



sand. 1 adult male and 1 young specimen. 

 Stat. 41. April 3. 7°25'S., U7°5o'.5E. Plankton, surface to 10 m. 1 young male. 

 Stat. 47. April 8/12. Bay of Bima, near south fort. 55 m. Bottom mud with patches of fine 



coral sand. 2 males. 

 Stat. 258. Dec. 12/16. Tual-anchorage, Kei-islands. 22 m. Bottom Lithothamnion, sand and 



coral. 1 ova-bearing female. 

 Stat. 261. Dec. 16 18. Elat, west coast of Great-Kei-island. 27 m. Bottom mud. 1 female 



without eggs. 



A species of small size : the ova-bearing female is 14 mm. long from apex of rostrum 

 to tip of telson, the other specimens are of the same size or a little younger. In the larger 

 male from Stat. 47 the acuminate rostrum reaches, beyond the eyes, to the distal extremity of 

 i st antennular article; it arises with a rounded carina nearly at the anterior third of the carapace 

 and is at first slightly directed downward to the middle of the corneae, while the rest is a little 

 upturned; the rostrum proper is slightly compressed, though it is blunt and obtuse above. Posterior 

 to the rostral carina the carapace, which is 4 mm. long, measured in the middorsal line, is 

 smooth and rounded, the posterior emargination is as large as in Lept. robusta, its margin 

 depressed, obvious. 



Otherwise than in the male the carapace of the female appears, like in Lept. robusta 

 Stimps. and Lept. carinata Ortm., tricarinate dorsally. The rostrum, more compressed than in 

 the male, has for the rest the same form and length; the rostral carina is continued backward 

 almost along the whole length of the carapace, viz. to the posterior seventh, where it gradually 

 widens and passes into the upper surface of the carapace; the carina is compressed, subacute 



