however, 2,1-times and in that from Stat. 274 only 1,93-times; in the last mentioned specimen the 

 carpal segments are hardly more slender than in the variety Leucothea. 



In the adult male from Stat. 99 the merus of i^^ legs appears 6,4-times, in the adult 

 female from Stat. 51 6,26-times, but in a male from the same station, the carapace of which 

 is 4 mm. long, almost 7-times as long as broad in the middle, just as in the typical specimens, 

 and in this male the distal e.xtremity of the lower margin appears rather sharp, so that, in the 

 adult specimens, the meri are somewhat less slender than in the young. Carpus four-fifths the 

 leno-th of the propodus, dactylus in the adult male a little more than one-third of the propodus, 

 but measuring in the younger male and in the adult female almost half the length of it, the 

 length of the dactylus being slightly variable. 



Remark. It is doubtful whether the species, described by Pearson under this name, 

 is indeed the true A. pareuchirtcs, for, according to this author, the ischium of third legs 

 should be unarmed. (J. Pearson, Ceylon Pearl Oyster Report, 1905, p. 86). 



General distribution: Maldive and Laccadive Archipelago (Coutiere). 



f59. Alpheus pareuchirtis Cout. var. Leucothea de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 1909, p. 105. 



Stat. 2. March S. 7°25'S., 113° 16' E. Madura-strait. 56 m. Grey mud with some radiolariae. 



I male. 

 Stat. 49\ April 14. 8°23'.5S., ii9°4'.6E. Sapeh-Strait. 70 m. Coral and shells. 12 specimens, 



among which i adult egg-bearing female and 7 males of different size. 

 Stat. 51. April 19. Madura-bay and other localities in the southern part of Molo-strait. 



5^ — go m. Fine grey sand; coarse sand with shells and stones, i male and i ova- 

 bearing female. 

 Stat. 86. June 18/19. Anchorage off Dongala, Palos-bay, Celebes. 36 m. Fine, grey mud 



(river-mud). 2 specimens. 

 Stat. 96. June 27. South-east side of Pearl-bank, Sulu-archipelago. 15 m. Lithothamnion-bottom. 



I adult female without eggs. 

 Stat. 99. June 28/29/30. 6°7'.5 N., I20°26'E. Anchorage off North-Ubian. i young female 



taken at the surface of the sea. 



Frontal margin at either side of the rostrum straight, transverse, not at all 

 excavate, rostrum as in the typical species. Spiniform tip of the stylocerite extending just beyond 

 the first article. Carpocerite very little longer than the upper peduncle; the scaphocerite, the 

 terminal spine of which is decidedly curved inward, is as long as the carpocerite and the blade 

 usually reaches to the end of the antennular peduncle. 



Merus of the large cheliped of a male long 16,5 mm. from Sapeh-Strait 3-times as long- 

 as broad in the middle, infero-internal margin with one or two spinules and, at the apex, with 

 a spiniform tooth. Chela a little longer than the carapace, somewhat higher than in 

 Coutiere' s specimens, the proportion between the total length and the height of the palm 

 beino- 2,65. Fingers as long as in the typical species, proportion between the length of the 

 chela and that of the fingers being 2,6. Both the groove on the outer face and that on the 

 inner reach a little more downward than in the typical species; the triangular groove on the 

 inner surface is just as deep as that on the outer and the lower boundary of that inner groove, 



