NO. 1659. AMERICAN SPECIES OF 8YNALPIIEU8—COUTIERE. 



75 



than wide; it is thicker thjui the chela (proportion 1.2:^), and almost 

 a.s lono; as the carpus and the chehv joined (proportion 0.79). 



In the female the proi)ortions become 1, '2.45, 0.87, the fin<>ers being 

 hmger; the carpus measures no more than 0.67 of the whole chela: 

 the meropodite is 3 times longer than wide, and is also thicker than 

 the chela; it measures 0.74 of the carpus and the chela together; the 

 size being the same, the sexual ditferences in the length of the chela 



Fig. 44. — Synalpheus herricki. a, frontal and antennal region, male and female ; 

 a', frontal and antennal region op another male ; c, carpocerite, male and 



female ; K, LARGE CHELA ; K" , CARPUS AND MEROPODITE OF LARGE CHELA ; fc', SMALL 

 CHELIPED of FIRST PAIR, MALE AND FEMALE; fc'", FINGERS OP SMALL CHELA OF FIRST 

 pair; 1, FOOT OF SECOND PAIR, MALE AND FEMALE; m, FOOT OP THIRD PAIR, MALE AND 

 FEMALE ; H)', DACTYL OF THIRD PAIR OF TYPICAL MALE ; tn" , DACTYL OF THIRD PAIR OF 

 ANOTHER male; t, TELSON, MALE AND FEMALE; U, UROPOD. 



are expressed by the proportions 1.45 for the large, 1.15 for the small 

 chela. 



In the second pair the first segment of the carpus is, in the male, 

 a little shorter than the sum of the four others, in the female a little 

 longer; the meropodite is a little longer in the male, the whole mem- 

 ber being more elongated (proportion 1.2). 



