DESCRIPTIONS OF zV NEW GENUS AND FOlTlt NEW SPECIES 

 OF CRABS FROM THE ANTILLEAN REGION. 



By Mary J. Rathiu n, 



Aid, I>cj)iirl i)H')it of Mnv'mc I unrlfhrulen. 



The crabs described below were, with one exception, obtained in 

 the extended cruise of the United States Fish Commission steamer 

 Albatross to tlie Gulf of Mexico and Caribbean Sea in 1885. The spe- 

 cies of Actcea formed a part of the large collection of invertebrates 

 brought from Florida by Dr. Edward Palmer in 1884. 



Family P A R T H E N o p i D A E . 



THYROLAMBRrS, new geuus. 



Carapace broader than long, deeply eroded. P'rontai and antero- 

 lateral region strongly detlexed. Entire surface covered with stellar 

 granules, which unite to form ridges outlining irregular pits. Maxilli- 

 peds broad, fitting closely together and filling the buccal cavity; 

 ischium subrectaugular posteriorly, slightly oblique anteriorly; merus 

 broader than long, with a slight notch at the antero-internal angle, in 

 which the first joint of the palpus is fitted in a transverse direction; 

 the remainder of the palpus is concealed beneath the merus. Chelipeds 

 of moderate length; manus much more slender than the merus and 

 armed on the inner or anterior side with 2 rows of long, sharp, curved 

 spines, which are continued on the fingers. 



THYROLAMBRUS ASTROIDES. uew species. 



Carapace about two- thirds as long as wide, thick, slightly wider at 

 the posterolateral than at the lateral angles; frontal and anterolateral 

 regions almost perpendicular. Posterior margin directed slightly for- 

 ward and outward. Besides the small pits everywhere present on the 

 surface there are other larger depressions. A deep hollow between the 

 orbits is continued backward by a shallow sulcus to the post-medial 

 region. Two deep depressions occur at the inner branchial angles. 

 The cardiac area is well defined and is bounded posteriorly by a trans 



[ Artvauce sheetti of thia i)aper were I'l'blished March 30, 1894.] 

 ProcoMlinu'si Xitioiiiil iluseum, Vol. XVII — No. OSti, 



83 



