66 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



narrow, depressed, occupied by two tubercles side by side. Frontal 

 teeth subequal, broad and blunt. Inner orbital tooth acute; width 

 of orbit equal to sinus directly in front of it. Antero-lateral mar- 

 gin incomplete, bearing at least nine teeth. One rudimentary pos- 

 tero-lateral tooth. 



Measureinents. — Length (approximate) of carapace 18.2 mm., 

 width (approximate) 27.2 mm., height at least 5 mm. 



Relation. — In the convexity of the carapace and the proximity of 

 the branchial regions this species resembles the recent Cancer lo-ng- 

 ipes^'- (Panama to Chile). The subpostero-lateral area and the 

 composition of the front are also akin to those of the genus Cancer. 

 The genus Branchiolafjnhrus is therefore placed in the Family Can- 

 cridae instead of the Parthenopidae as heretofore. It differs from 

 Cancer in the triangular shape of the anterior two-thirds of the 

 carapace and the outwardly directed orbits. 



Family PORTUNIDAE Dana 



Carapace moderately transverse, usually widest at last antero- 

 lateral marginal tooth ; front with or without median tooth. Anten- 

 nules fold back transversely or obliquely. Third maxillipeds not 

 overlapping endostome. Ambulatory legs flattened and more or less 

 distinctly adapted for swimming. | 



Genus CARCINIDES Rathbun | 



Carcinides Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, p. 164 ; type, 

 C. maenas (Linnaeus). 



Carapace not broad, subhexagonal, no distinct transverse ridges; 

 antero-lateral borders cut into five teeth. Front slightly projecting, 

 three-lobed. Chelij^eds massive ; arm short, unarmed ; inner angle of 

 wrist spiniform; no spines nor costae on hand; fingers stout, not 

 strongly toothed. ■! 



Cretaceous; Eocene; Recent. 



CARCINroES MINOR, new species 



Plate 16, figs. 9 and 10 



Description of ho7oti/pe. — Carapace with a quinquedentate antero- 

 lateral margin (pi. 16, fig. 9), the convex outer edges of the teeth 

 forming a regular arch, their inner edges nearly straight, tips acute, 

 first or orbital tooth smaller than second, fifth small and less pro- 

 jecting laterally than the fourth, which marks the widest part of 

 the carapace. Two slight fissures in upper border of orbit; fronto- 



«Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), p. 87; Trans. Zool. Soc. London, 

 vol. 1, 1830, p. 337, pi. 43. 



I 



