362 THE GENUS PANOPEUS BENEDICT AND KATHBUN. 



cate. Third tooth much the largest, broadly triangular, its anterior 

 margin nearly perpendicular to the median line of the carapace. Fourth 

 tooth triangular, anterior margin sloping backwards to the tip. 



External hiatus of the orbit broad and rounded at the base, in the 

 smaller specimens more V-shaped. Sub-hepatic tubercle present. 



Seventh segment of the sternum in the male very slightly if at all 

 exposed. Coxte of fifth pair of feet in contact with third abdominal seg- 

 ment. In the auchylosed segment the outline of the third normal seg- 

 ment is rather angular. Outline of the fourth normal concave and of 

 the fifth normal convex. Terminal segment somewhat triangular, 

 rounded at the tip. Penultimate segment widest at its distal end, while 

 in lierhstii the segment is of the same width throughout its length. The 

 very different arrangement of the second and third segments distin- 

 guishes this species from hernmdensis. A comparison of the appendages 

 of the male abdomen shows it to be widely separated from herhsHi. 



Chelipeds very much like those of lierbsiU. Lower margin of hirge 

 hand a little straighter, and in some specimens convex. Hand a little 

 deeper than in herbstii, movable finger slender and strongly arched, 

 making a conspicuous gape in all the specimens from the largest to the 

 smallest. Cylindrical tooth at the base of the movable finger long. 

 Tooth on the manus less conspicuous than in herbstii. Dactyls of am- 

 bulatory feet hairy. There are a few hairs on the propodal joints. 



Length of carapace in large specimen, 21.5 millimetres; width, 27.5 

 millimetres. 



RECORD OF SPECIMENS EXAMINED. 



Caribbean Sea : Jamaica (7783) ; St. Thomas (Yale Univ. Miis.); Aspiuwall (Yale 

 Univ. Mus.); Sabanilla, U. S. C. (1564(i). 



Brazil; Hartt Explorations: Maranhao; Platafornia, Bahia ; Bom Fim, Babia. 



4. Panopeiis validu.s Smith. 

 (Plate XIX, Ijg. 3: plate xxiii, tig. 13.) 



Panopeus validus. S. I. Smith, Proc. Boston See. Nat. Hist., xii, p. 278, 1869: Ann. 



Rept. Feabody Acad. Sci., 3, p. 89, 1870. W. N. Lockingtou, Proc. Cal. Acad. 



Sci., VII, p. 102, 1871). J. S. Kingsley, Proc. Boston Soc. Nat. Hist., xx, p. 152, 



1879. 

 ^'? Panopeus clnlensis." A. M. Edwards, Miss. Sci. au Mexique, pt. 5, i, p. 315, 1860. 



Front divided by a closed fissure, the outer end of which rounds out 

 into the lobes. In some specimens the posterior lobe of the coalesced 

 tooth is produced forward to the same line as the anterior. Posterior 

 lobe larger and more consi)icuous than the anterior. Male abdomen 

 much as in herbstii. Seventh segment of sternum very slightly exposed. 



Length of carai)ace in large specimen, 34 millimetres ; width, 48 mil- 

 limetres. 



The specimens which we have examined are distinct from P.chiJensis 

 as figured by Edwards and Lucas in d'Orbigny's Voy. I'Am^r. Merid., 

 1843, pi. Yiii, fig. 2, and with our present knowledge we do not feel 

 warranted in uniting the two species. 



