106 PROCEEDINGS OF THE ACADEMY OF 



along half the extent of their denticulated margins. The second pair of feet 

 about the same length as the carapax, rostrum included. 



The surface covered with close, short hair. Length of the body to the tip 

 of the rostrum one inch and a half. 



Habitat. Chili. 



(Cabinet Phila. Acad. Nat. Sci.) 



Libinia rhomboidea, Streets, n. s. 



Carapax nearly circular. Regions distinct ; those in the median line of 

 the body flattened. Six small but sharp spiues on the gastric region ; five ar- 

 ranged transversely on the anterior part. The two outer ones and the middle 

 are larger, and are placed in a direct line with one another ; the two inter- 

 vening ones are smaller, and are situated a little in front of the others. One 

 spine situated on the posterior part of the stomach. All the spines on the 

 central regions small. Genital region quadrilateral and bearing a small spine. 

 One on the cardiac region and one on the intestinal. On the posterior part of 

 the cardiac region is an elevation which presents a depression in its summit. 

 Four large and sharp spines on the branchial region independently of those 

 on the lateral margin. These are placed so as to inclose a rhomboidal-shaped 

 figure between them. A prominent spine on the hepatic region ; five on the 

 lateral margin. These with the one on the hepatic region form nearly half a 

 circle. Below the lateral row anteriorly are two prominent spines. 



A prominent spine above the icftier canthus of the eye ; a small one at the 

 external canthus. External antennae cylindrical. A spine situated to the 

 outer side of them, and one beneath directed downward. 



Rostrum not so broad as in L. dubia, and its bifurcation less divergent, the 

 teeth being directed nearly horizontally forward. Anterior pair of feet short 

 and granular; a short spine on the lower portion of the arm. Second pair of 

 feet nearly one and a half times as long as the body. Length of the body 

 three inches and a half. 



Habitat. East Indies. 



(Cabinet Phila. Acad. Nat. Sci.) 



In the Academy's collection is a single specimen, which very much resem- 

 bles the preceding, and in the absence of any others of the same kind to con- 

 firm the characters, I will not venture to call it a new species. The following 

 are the chief points of difference. The regions in the median line of the body 

 less depressed. The transverse row of spines on the anterior portion of the 

 gastric region are arranged somewhat differently. The two lateral ones on 

 each side are placed in a direct line, while the middle one is situated a little 

 posteriorly. The bifurcation of the rostrum is more divergent and the teeth 

 are inflated to their tips. Second pair of feet but little longer than the body. 

 Length of the body two inches and four-fifths. 



Habitat. West Indies. 



If this should prove a new species, I propose for it the name of Libinia in- 

 flat a. 



Chionoecetes Chilensis, Streets, n. s. 



Body very much depressed, flattened on top ; nearly as broad as long. Pos- 

 terior border rounded; broad anteriorly. Anterior and middle portions of 

 the carapax covered with small wart-like prominences, which are depressed. 

 These terminate in a more or less well-defined line drawn transversely through 

 the centre of the cardiac region. All that portion of the surface not covered 

 with prominences, granular. Regions not very distinct; gastric region some- 

 what triangular. External angle of the orbit projecting. Rostrum very 

 short, and flattened. Eyes large, of a brown color with black spots. 



Anterior pair of feet but little longer than the body. Internal and external 

 borders of the under surface of the arm minutely spinous. These as well as 

 the other feet granular. Fingers long and slender, more than half the length 



[Sept. 



