284 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



PEUA PULCHELLA Bell 



Plate 241, figs. 1-4 



Pelia pulchella Bell, Proc. Zool. Soc. London, vol. 3, 1835 (1836), p. 170 

 (type-locality, Galapagos Islands; type not extant); Trans. Zool. Soc. 

 London, vol. 2, 1836, p. 45, pi. 9, figs. 2, 2d-2f. 



Diagnosis. — Rostrum long, nearly half as long as remainder of 

 carapace. Basal article of antennae almost wholly exposed in 

 dorsal view. 



Description (after Bell). — Carapace pyriform, gibbous, rounded, 

 polished, somewhat hairy; regions elevated, the cardiac region form- 

 ing a rounded tubercle. Rostrum straight, nearly half as long as 

 remainder of carapace, bifid at extremity, with a slight groove con- 

 tinued backward from the bifurcation. Basal article of antennae 

 almost wholly exposed above, slightly tapering toward its extremity 

 where there is a small external tooth; flagellum extending a little 

 beyond apex of rostrum. 



Chelipeds longer than body; arm with a toothed carina above and 

 two carinae beneath, the outer of which is minutely serrated; hands 

 slightly compressed, smooth; fingers, when closed, in contact through- 

 out their whole length, the half toward the apex being serrated, and a 

 tubercle of the immovable finger fitting into a corresponding excava- 

 tion in the movable one. Ambulatory legs compressed, carinated 

 and hairy above. 



Measurements. — Male holotype, length 4 lines (10.16 mm.), width 

 2}4 lines (6.35 mm.). 



Locality. — Known only from the unique type taken at the Gala- 

 pagos Islands, 6 fathoms, sandy mud. 



Genus PISOIDES Milne Edwards and Lucas 



Pisoides Milne Edwards and Lucas, d'Orbigny's Voy. rAm6r. M6rid., 

 vol. 6, pt. 1, 1843, p. 10; type, P. tuherculosus Milne Edwards and 

 Lucas.— Dana, U. S. Expl. Exped., vol. 13, Crust., pt. 1, 1852, p. 79. 



Carapace much longer than wide, trianguliform, slightly swollen. 

 Gastric and cardiac regions very apparent and separated from each 

 other and from the branchial regions by rather deep furrows. Ros- 

 trum directed a little obliquely downward and armed with two 

 very long and moderately divergent spines. Eyes imperfectly re- 

 tractile, peduncle short, constricted at middle, its base filling the 

 orbital cavity. This last has a cut on its upper margin, but is devoid 

 of a tooth above its inner angle; below, the cavity is incomplete but 

 there is a small spine near the base of the antenna and a large and 

 very sharp tooth at the outer orbital angle. Basal article of antenna 

 a little longer than wide, and having at its antero-external angle a 

 small tubercle which is advanced between the next or movable 



