758 ME. W. F. LANCHESTER ON cet/staceans [June 19, 



are representative of the species : and two males and two females 

 (although with some doubt) of M. Zehntner's variety. I also find 

 two males answering to Dr. de Man's var. crassimana ; these were 

 obtained on the shore. 



Dim. d 14x13. ? 17x15. 



Var. crassimana. J 11-5 X 10-25. tf 775 x 7'25. 



Var. Icevimana? rf 12x10-5. 6 12-75x11. $ 10x9. 

 2 9x7-75. 



87. Sesaema fasciata, sp. nov. (Plate XLVII. fig. 12.) 



Hab. Singapore : marshy ground near sea. One male and three 

 females. 



This species belongs to Dr. de Man's subgenus Parasesarma, in 

 which the sides have no tooth behind the orbital angle, and in 

 which there are two or more pectinated ridges on the palms. Cara- 

 pace smooth to the eye, but under the lens seen to be closely punc- 

 tated everywhere : sides nearly parallel (but broken up in one of the 

 females just behind the eyes so as to give indications of a tooth 

 behind the orbital augle). Tooth at distal end of the upper border 

 of the merus very small and obtuse, and the anterior border only 

 slightly expanded, the long proximal edge of the expansion being 

 dentated. External surfaces of merus and carpus rugose, inner 

 angle of carpus with a large triangular tooth; outer surface of palm 

 and fingers quite smooth to the eyes, but minutely punctate under 

 the lens ; whole inner surface of chelipedes smooth. Inner upper 

 border of hand thick and prominent : external to this there are 

 three pectinated ridges, which lie more nearly longitudinal than 

 transverse. The middle one consists of : — a, a short distal portion, 

 practically one with the distal part of the inner upper border ; b, a 

 longer middle portion running obliquely from near the upper 

 border to the upper part of the posterior border, and cutting off a 

 small semicircular piece of the upper surface in which lies another 

 very small pectinated ridge ; and c, a proximal portion, curving 

 sharply from the middle portion to run parallel to the posterior 

 border as far as the joint of hand and carpus. The third pectinated 

 ridge starts from the inner and upper base of the dactyl, to run in 

 front of, and parallel with the middle portion of the middle ridge, 

 and to stop abruptly half-way between its starting point and the 

 joint of hand and carpus. Only 5 or 6 obscure, low tubercles can 

 be distinguished on the upper margin of the dactyl, which stop 

 some distance from the tip : inner margins of both lingers with 4 

 or 5 broad triangular dentieulations. Meri of ambulatory legs 

 with a subdistal low and blunt spine ; remaining joints with hairs, 

 rather diffuse, but tending to be arranged on the anterior and 

 posterior margins. Male abdomen seven-jointed, broad, regularly 

 tapering from the middle of the 3rd segment to the middle of the 

 6th where it suddenly narrows ; the 7th has a rounded extremity, 

 parallel sides, and is only a little longer than broad. Colour a 

 deep crimson red, with regular mottlings of a light yellow, and a 

 light yellow band, or fascia, placed transversely on the frontal 



