222 Bulletin VanderbUt Marine Museum, Vol. VII 



this being terminal to the aforementioned oblique series of dorsal, 

 smaller tubercles. 



The basal antennal article has a short, triangular spine at the 

 external distal angle and a second, smaller tooth near, or on, the 

 inner distal margin. Large old specimens bear a spine or denticle 

 near the external angle of the buccal cavity. 



The external maxillipeds are close-fitting; the meral article 

 of the endognath is truncate distally, with distal outer angle 

 rounded ; the antero-inner angle emarginate. 



The chelipeds are subequal, 33.5 centimeters long ; the merus 

 is subcylindrical, a trifle wider distad, with a prominent row of 

 six to ten primary tubercles in longitudinal series on the upper 

 surface, a similar row of seven or eight primary tubercles on the 

 anterior lateral margin ; several smaller spinules are scattered on 

 the merus irregularly; the carpus is convex dorsally with two 

 lines of small spines; the propodus and finger are 17.5 centi- 

 meters long, the finger being 6 centimeters of this total length; 

 the propodus is 2.5 centimeters wide proximally and 3 centi- 

 meters wide distad; the fingers are slender, smooth, nude, sepa- 

 rated proximally by a small, elliptical sinus, each with a large 

 basal molar and eighteen to twenty smaller teeth in continuous 

 series ; the apices of the fingers are pointed, meeting. 



The four pairs of ambulatories are quite long, strong, furred, 

 with strong, acuminate dactyli, which are about .75 as long as 

 the related propodi. The four pairs of legs successively decrease 

 in length by about .2 of the length of the preceding pair. 



References: Pericera ovata, Bell, T., Proc. Zool. Soc. London, 

 1835 (1836), p. 173; Trans. Zool. Soc. London, 1836, vol. II, 

 p. 60, pi. 12, figs. 5, 5o, 5p and 5q. 



Stenocionops ovata, Rathbun, M. J., Proc. U. S. Nat. Mus., 1910, 

 vol. XXXVIII, p. 574. ; Bull. CXXIX, U. S. Nat. Mus., p. 459, 

 p. 574. — Boone, L., Zoologica, N. Y. Zool. Soc, 1927, vol. 

 VIII, p. 167, fig. 54. 



Pericera macdonaldi, Rathbun, M. J., Proc. U. S. Nat. Mus., 

 1892, vol. XV, pi. 29 ; op. cit. Bull. CXXIX, p. 460, pi. 268. 



Pericera triangulata, Rathbun, M. J., op. cit., 1892, p. 246, pi. 32, 

 fig. 1; Ibid, 1898, vol. XXI, p. 577; op. cit, Bull. CXXIX, 

 p. 461, pi. 165, fig. 1, pi. 266, fig. 1. 



