36 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXVI. 



The proi^ortion of the small chela to the large one is as 1 to 2.5. 

 Its relative dimensions are : Fingers 1 ; total length 2.2 ; height 0.72 ; 

 its meropodite also ends in a strong triangular lobe. 



In the second pair the first article of the carpus is approximately 

 equal to the four others taken together; the chela is a little shorter; 

 the meropodite measures about 0.8 of the length of the carpus. 



The relative proportions of the third pair are: Meropodite 2.33; 

 carpus 1; propodite 2, or a little less; the meropodite is 3.5 times 

 longer than wide, this proportion diminishing in adult females or in 

 males of small size to 3.7; it reaches even 4 in a perfectly typical 



P'iG. 18. — Synalpheus fritzjivlleui. a, frontal and antennal reoion ; c, carpocer- 

 ite; K, large chela; K", carpus and meropodite of l\rge cheliped; k". small 



CHELIPED OF FIRST PAIR ; I, FOOT OF SECOND FAIK ; )», FOOT OF THIRD PAIR ; »«', DACTVL 

 OF THIRD pair; in", REVERSE OF SAME; t, TELSON. 



female from Cape Florida ; the two hooks of the dactyl are divergent, 

 the ventral nearly twice as thick as the dorsal, with the anterior 

 margin more convex ; it does not directly continue the inferior margin 

 of the dactyl, rejoining it by a concave curve of short radius in such 

 a manner as to form a third obtuse prominence. 



The telson has its posterior angles obtuse, its posterior margin bears 

 twenty plumose hairs between the tAvo pairs of habitual spines. 



The eggs are of small size, and the larvae are zoeae. 



The typical specimens are from Florida, some of them living in 

 sponges; the species is also met with in Porto Rico and in Jamaica. 

 In these three regions the typical examples predominate, but the 



