NATURAL SCIENCES OF PHILADELPHIA. 225 



DESCRIPTIONS OF FIVE NEW SPECIES OF CRUSTACEA FROM MEXICO. 



BY T. HALE STREETS. 



PACHYCHELES MEXICANUS, nor. sp. 



Plate II. Fig. 1. 



Carapax broadly oval, about as broad as long, slightly convex 

 antero-posteriorly ; surface shining, but minutely granular through 

 the lens ; anterior portion of the carapax cTeflexed, triangular, and 

 furrowed, a small white spot at the tip ; neither spines nor teeth 

 an^^where on the body ; eves small, supra-orbital border concave 

 and inflated. Carpus as broad as long ; three teeth on the ante- 

 rior border ; two slightly elevated ridges of granules on the supe- 

 rior surface ; hand broad and large, the right larger than the left ; 

 fingers hooked at their extremities, denticulated ; surface of the 

 carpus and hand more coarsely granulated than the carapax ; the 

 granules extend to the ends of the fingers. Color red, with patches 

 of a lighter shade ; three posterior pairs of legs striped ; the last 

 article furnished with a few stiff hairs. Length of the carapax 

 0.18 inch; the hand 0.25 inch. 



Habitat. — Gulf of Teliuan tepee, Mexico. 



PANULIRUS GRACILIS, nov. sp. 

 Plate II. Fig. 2. 



Antennary ring armed with two spines, situated near together 

 on the anterior border ; behind these, and separated more widely 

 from each other, are two rudimentary spines, seen through the 

 lens; two stout horns projecting forward over the base of the 

 ophthalmic peduncles ; surface of the carapax covered with spines, 

 larger anteriorly than posteriorly ; also furnished with a few stiff 

 hairs, attached mostly to the spines ; epistoma armed with three 

 spines ; abdomen smooth ; the transverse sulci, except the last, 

 interrupted in the middle ; a pit between the last nearly connects 

 them, separated by two very narrow bands on either side of the 

 pit. Color reddish-brown ; external antennae striped with bands 

 of white. Length 0.9 inch. 



Habitat. — Gulf of Tehuantepec, Mexico. 



PAL^MON DASYDACTYLUS, nov. sp. 



Plate II. Fig. 3-3a. 



Rostrum long and slender, reflexed, extends beyond the lamel- 



liform appendages of the external antennse ; armed on the superior 



margin with nine or ten teeth, and six or seven on the inferior 



1871.] 



