ANOMOURA PORCELLANIDEA. 421 



c. Carapax transversim rugatus. 



Porcellana Boscn ? Savigny. 



Plate 26, fig. 11, animal, natural size. 



Rio Janeiro \ found among serpulas along rocky shores. 



Length of carapax, three-fourths of an inch to one inch. Colour, 

 deep cherry-red, paler at the base of the ridges. Beak prominently 

 triangular, obtuse. Ridges of carapax and legs finely ciliated, those 

 of the hand and carpus slightly crenulate. Carpus with four large 

 denticulate serratures on the anterior margin, #nd outer margin of 

 upper surface furnished with a few short spines. Hand broad and 

 large (nearly twice as wide as carpus), with outer edge finely serrate, 

 moveable finger with apex much prolonged and incurved, densely 

 villose beneath. Following pairs of legs thin hairy, third joint ciliate 

 on anterior margin. Basal joint of outer antennae quadrate anteriorly 

 and having angles acute and a little divergent; second joint cylin- 

 drical, length, more than three times that of the carapax. In our 

 specimen, the ridges of the carapax are continued uninterrupted or 

 nearly so across the medial region, while they are represented as much 

 broken in the Boscii. The rugosa of Edwards is described as having 

 five or six teeth to the anterior margin of the carpus. 



P. Boscii, Savigny, Crust., Egypt, pi. 7, f. 2. 



4. Frons tridentatus.* 

 PORCELLANA PUNCTATA ( Glierin) . 



San Lorenzo. 



* The lateral teeth of the front are either near the medial, or else distant and over 

 the eyes. By losing their prominence, they pass gradually into species having a simply 

 triangular front. P. tomentosa is intermediate, it having lateral lobes, but the front of 

 these lobes is transverse and not salient, tooth-like. 



106 



