54 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



cilia; there are about ten transverse ridges on the posterior region of 

 the carapace; the linea anomurica is very distinct. The transverse 

 ridges curve forward below it. The abdominal segments are devoid 

 of spines ; there are two transverse sculptured ridges, each anteriorly 

 fringed with cilia; the anterior ridge on each segment is the longer, 

 extending down on the epimera; the telson has the posterior margin 

 evenly bilobate; there is a median longitudinal groove and the pos- 

 terior suture lines are oblique; the dorsal surface has the numerous 

 clusters of setae each arranged in a small arc. The large, fan-like 

 rhipidura have a small spine at the inner posterior angle of the upper 

 distal margin of the peduncle; the outer blade is smaller than the 

 inner, both have the outer margins truncate, slightly rounded. Both 

 the telson aiid rhipidura have the margins heavily fringed with long 

 setae. 



The eyes are mounted on a short stalk ; the cornea is large, bulbous, 

 subspherical. 



The antennulae extend beyond the rostrum for slightly more than 

 the length of the last joint and flagella. 



The antennae have a three- jointed peduncle and a flagellum that 

 extends to midway the fingers of the extended chelipeds. 



The chelipeds are equal, 42 mm. long, slender; the ischium has a 

 long, acuminate tooth on the inferior distal margin ; the long merus 

 is armed with an acuminate tooth on its median upper and inner dis- 

 tal margins. There is one (occasionally two) acuminate teeth on the 

 inner lateral margin of the carpus and two spinules on the median 

 upper and inner distal margins ; the propodus is almost as long as the 

 slender curved fingers, which meet along the cutting edges and over- 

 lap at the tip. The upper surfaces of the meral, carpal and propodal 

 joints are ornamented with a series of arch-shaped granules which are 

 anteriorly fringed with long setae ; these granules are placed in close, 

 regular formation, covering the entire dorsal surface. 



The second, third and fourth legs are similar, decreasing in length 

 posteriorly; each has the meral joint with its upper surface granu- 

 losa; the long propodus and slender, acuminate dactyl are laterally 

 compressed, the propodus longitudinally channelled, the dactyl very 

 acuminate and slightly twisted. 



Synonymy. — Galathea gregaria Fabricius, Ent. Syst. II, p. 473, 1793. 



Grimothea gregaria Leach, Diet. d. Sci. Nat., vol. 18, p. 50, 1820. — 



Dana, U. S. Explor. Exped., vol. 13, Crust., part 1, p. 483, pi. 



