OXYSTOMATOUS and allied CRxVBS of AMERICA J §3 



and from each other; a large, pointed, granular tubercle on the median 

 line of intestinal region. In the male the four posterior marginal 

 protuberances are strong, the middle pair flattened, horizontal, blunt, 

 the branchial pair more conical, acute and incUned upward; in the 

 female the protuberances are shorter. A small cluster of large granules 

 at summit of hepatic region and also on the pterygostomian promi- 

 nence. A row of tubercles on anterolateral margin of branchial 

 region. Rostrum upturned; carapace narrowed just behind orbits. 

 The efferent branchial channel does not reach forward to the line of 

 the orbital margin. Lower surface of body and also the merus of 

 chelipeds covered with large depressed granules. Chelipeds of male 

 about two and one-half, of female about one and one-half times the 

 length of carapace; wrist and palm with small crowded granules; 

 merus of legs more finely granulate; the fourth pair has a row of spiny 

 granules below. Third, fourth, and fifth segments of male abdomen 

 partially fused, the sutures persisting. 



Measurements. — Holotype, male, median length of carapace 12.5; 

 wddth 11; length of chehped about 30 mm. 



Range. — Gulf of California, Mexico; 9/2 to 71 fathoms. 



Material examined. — See table 57, page 184. 



Subfamily Leucosiinae 2° (restricted) 



Iliinae Alcock, Journ. Asiatic Soc. Bengal, vol. 05, p. 166, 1896 (part). — 

 Ihlb, Die Decapoda Brachyura der (Sifco^a-Expedition, monogr. SQb^, p. 

 205, 1918 (part). 



Merus of external maxillipeds less than half the length of the 

 ischium measured along the inner border. Fingers slender, almost 

 of the same diameter from base to near tip, either very much longer 

 than the hand, or if shorter than the hand then of fihform slender- 

 ness; either opening and closing in a vertical plane, or if in a nearly 

 horizontal plane then the tip of the dactylus is movable through an 

 arc of about 120°; hands either short, swollen, and subglobular, or 

 tapering-cylindrical with a swollen base, always much broader at the 

 base than at the point of origin of the fingers. 



Genus ILIACANTHA Stimpson 



Iliacantha Stimpson, Bull. Mus. Comp. Zool., vol. 2, p. 155, 1871 (type, /. globosa 

 Stimpson). 



Carapace globular, having three spines (one median) at posterior 

 extremity of carapace. Anterior half of carapace unarmed or with 

 one spine on either side. Chelipeds and legs very slender; palms 

 twisted so that the fingers open in a vertical instead of a horizontal 

 plane. The anterior extremities of the pterygostomian channels pro- 

 ject beyond the orbits. Abdomen of male with segments 3-5 fused. 



North Carolina to Bahia, Brazil; Lower California to Colombia. 



" Leucosia pacifica Poeppig, Arch, fiir Naturg., vol. 2, pt. 1, p. 140, pi. 4, flg. 3, 1836, from Bay of Talca- 

 huano, Chile, is a pinnotherid. See also footnote 17, p. 123. 



