78 Bulletin, Yanderhilt Marine Museum, Vol. Ill 



equal to those on the anterior margin of the carpus, and has its margin 

 finely serrate; the carpus is equal to six-tenths of the width of the 

 carapace, and is two-thirds as wide as its own length ; it has the an- 

 terior lateral margin cut into five acute, jagged, triangular teeth, 

 which have their margins finely serrate; the posterior lateral margin 

 is accentuated by a series of about six rugae, which are produced into 

 upward- and forward-pointing spines, the distal one of which projects 

 beyond the margin ; a series of about six prominent, rounded squamae 

 form a median ridge on the dorsal surface ; smaller granules are scat- 

 tered on the remaining dorsal area; the distal carpal margin is sinu- 

 ate; the propodus is triangulate, nearly twice as long as the carpus, 

 decidedly flattened, with the lower margin beaded with a series of 

 small rugae, each of which is produced into an acute, outward-point- 

 ing spine ; there is a prominent row of low, rounded squamae extend- 

 ing from the upper proximal angle of the propodus to the tip of the 

 hinged finger; the upper lateral margin of the palm is carinate, and 

 its distal angle is an acuminate tooth; the upper lateral margin of 

 the hinged finger is subequal to that of the propodus, close-fitting, the 

 cutting edges concave, the tips curved. There is a sparse pilosity in 

 the inner hiatus of the hinged finger. 



The first three ambulatories are subequal. Each has the merus 

 greatly expanded, three-fifths as wide as long, or equal in length to 

 the carpus of the cheliped and with the lateral margins convex, con- 

 vergent proximally and distally ; the dorsal surface crossed by trans- 

 verse rugae, sparsely setiferous ; the posterior distal angle of the first 

 and second pairs of ambulatories with a subdistal spine ; on the third 

 pair of legs this spine is absent; the carpus is about half as long as 

 the merus but much slenderer ; the propodus is similar to but a third 

 longer than the carpus and has its distal lateral margins produced 

 into rounded plates, which reinforce the dactyl; the dactyl is half 

 as long as the propodus, stout basally, with a strong curved tip ; the 

 carpus, propodus and dactyl are sparsely furnished with long, stiff 

 setae. There is a longitudinal series of small, sharp spines on the 

 ventral margin of the propodus and dactyl. 



The fifth legs are typically small and slender, offering no specific 

 characters. 

 Synonymy. — Porcellana galathina L. A. G. Bosc (not Say), Hist. 



Nat. Crust., vol. 1, p. 233, pi. 6, fig. 2, 1802. 

 Porcellana sexspinosa L. R. Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 

 3, p. 190, 1850. 



