248 University of California Publications in Zoology  [Vou. 23 
Genus Heteractaea Lockington 
Similar in form to Pilumnus but lacking the palatal ridges which define the 
efferent branchial channels in that genus; fronto-orbital border half or more than 
half the greatest width of the carapace. Ambulatory legs armed above with a 
curiously shaped horned or lunate crest. Abdomen of male five-jointed. 
Heteractaea lunata (Milne Edwards and Lucas) 
Plate 37, figure 9 
Pilumnus lunatus Milne Edwards and Lucas, in D’Orbigny’s Voy. dans 
1’Amér. mérid., Crust., 6, pt. 1, p. 20, 1843, pl. 9, fig. 2, 1847. 
Heteractaea pilosus Lockington, Proce. Calif. Acad. Sci., 7, 97, 1876 (1877). 
Heteractaea lunata A. Milne Edwards, Crust. Rég. Mex., p. 301, pl. 52, 
fig. 2, 1879; Rathbun, H. A. E., 10, 185, 1904. 
Characters.—Carapace quite thickly tomentose, with exception of the smooth, 
shining and naked anterior margin of the frontal lobes, upper and under margins 
of orbit, and a small tooth just external to the outer hiatus of the orbit; upper 
margin of orbit a thick, long, sinuate tubercle; anterolateral margin with three 
sharp teeth projecting beyond the tomentum. Chelipeds unequal, tomentose; 
carpus and hands covered with tubercles which are arranged in regular rows on 
the outer side of the hand. 
Dimensions.—Specimens examined by Lockington: greatest length of male 
19 mm., of female 15 mm., greatest width 27 and 20 mm. respectively. 
Color.—In alcohol the teeth of front, upper and under margins of orbit, and a 
small tooth just external to the outer hiatus of the orbit are all red, smooth, 
shining and naked; remainder of upper surface of carapace thickly tomentose. 
Tubercles of manus and carpus red, the red predominating at distal end of merus 
(Lockington). 
Type Locality.x—Valparaiso, Chile. 
Distribution.—San Diego, California (Faxon), to Chile. 
Family GONEPLACIDAE 
Carapace squarish, front quite broad, frequently with a median notch; orbits 
transversely elongated, eye-stalks long; anterolateral angles spiniform. Anten- 
nules fold back transversely or obliquely. Fingers of chelipeds practically straight 
longitudinally. 
Genus Speocarcinus Stimpson 
Carapace longitudinally convex, almost semi-cylindrical, transversely nearly 
flat, posteriorly narrowing very little, anteriorly margins arcuate and dentate; 
front less than half the width of the carapace; orbits marginal, oblong. Outer 
maxillipeds moderately separated from each other, merus subquadrate, with a 
notch at antero-internal angle for the insertion of palp. Abdomen of male with 
base much narrower than the last thoracic sternum; third, fourth, and fifth 
segments coalesced. 
