684 PBOCEEDINGS OF THE NATIONAL MUSEUM. 



other except posteriorly, where they converge; they are armed ante- 

 riorly with a minute spine. Anterior border of the carapace produced to 

 form a short subocular spine. Branchiostegian spinule minute. Cer- 

 vical groove sinuous. Areola broad, about one-half as long as the ante- 

 rior section of the carapace. The branchio-cardiac lines form a slightly 

 raised, blunt ridge in the anterior part of their course. Sides of cara- 

 pace granulate; no lateral spines. Abdomen longer than cephalo- 

 thorax, pleurte broadly rounded. Telson truncate, with posterior 

 corners rounded; a pair of lateral spines about two-thirds the way 

 from the proximal to the distal ends. Anterior process of epistome 

 broad, separated from the posterior part by a transverse furrow, sides 

 slightly convex, apex blunt. 



Antennae rather short; proximal segment armed with one small 

 spine external to the orifice of the green gland; two more small spines 

 on the external side of the antenna, one at the base of the scale, the 

 other farther forward and at a lower level ; antennal scale short and 

 broad, broadest at the middle, internal border very convex, external 

 border inflated and terminated by a small spine. Third maxillipeds 

 densely bearded. Chelipeds of moderate length; margins of merus 

 spinulose, lower face spinuloso-granular, as is also the distal part of 

 the inner face; carpus triangular, upper border and inner face thickly 

 set with small spiniform tubercles, outer face squamoso-tuberculous; 

 chelie of moderate length, symmetrical, inflated, ornamented with low 

 squamous tubercles on the superior and inferior margins, outer face 

 nearly smooth, inner face clothed with long hairs; fingers longer than 

 the palm, incurved, their inner faces excavated, bearded, cutting edges 

 denticulate, with one prominent denticle on each finger — the one on the 

 movable finger proximad of the one on the immovable finger; tips acute. 



Length 90 mm. ; carapace 42 mm. ; from tip of rostrum to cervical 

 groove 28 mm. ; from cervical groove to posterior border of carapace 

 14 mm,; length of abdomen 45 mm.; width of areola 5 mm.; length 

 of cheliped 59 ram.; merus 16 mm.; length of chela 25 mm.; breadth 

 of chela 11 mm.; length of dactylus 15 mm. 



Habitat.— Montevideo, Uruguay. W. E. Safford, U. S. S. "Yandalia." 

 (No. 12581, Coll. U.S.N.M.) Three specimens. There is also a small 

 specimen in the collection of the Philadelphia Academy of Sciences 

 labeled, "Brazil" (No. 287 Guerin Coll.). According to the manu- 

 script label accompanying the specimens in the United States National 

 Museum, they were found in burrows one hundred meters from the coast 

 and two meters deep, in strata of sand covered by soil. 



This species is allied to Parastacus pilimanus^ and P. brasiliensis.^ 



' Astacns pilimanus voN Martens, Arch. f. Naturgesch., 35ter Jahrg., I, p. 15. pi ii, 



figs. 1, l/>, 1869. — Parastacusjnlimavns'Hvy.i.KY, Proc. Zool. Soc. London, 1878, p. 771. 

 Habitat. — Porto Alegre, and also Santa Cruz, in upper part of tlie Rio Pardo basin, ; 

 tributary of the .Jacuhy, Brazil. Types in Berlin Zool. Mus., Nos. 3323, 3447 (von 

 Martens). 



"Astacns hrasilicnsis von Martens, Arch. f. Naturgescli., 35ter Jahrg., I, p. 16, pi. ii, 

 figs. 2, 2b, 1869. — Parastacus brasilicnsia Huxley, Proc. Zool. Soc. London, 1878, 



