248 University of California Publications in Zoology [Vol. 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- join ted. 



Heteractaea lunata (Milne Edwards and Lucas) 



Plate 37, figure 9 



Pilumnus lunatu-s Milne Edwards and Lucas, in D'Orbigny's Voy. dans 



1 'Amer. merid., Crust., 6, pt. 1, p. 20, 1843, pi. 9, fig. 2, 1847. 

 Heteractaea pilosus Lockington, Proc. Calif. Acad. Sci., 7, 97, 1876 (1877). 

 Heteractaea lunata A. Milne Edwards, Crust. Peg. Mex., p. 301, pi. 52, 

 fig. 2, 1879; Eathbun, 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. — 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. 



