MAIOIDEA. 95 



SCYRA ACUTIFRONS. 



Ovata, fere inermis, rostro lamellato, cornubus avato-lanceolatis, acutis, 

 integris; spind prceorbitali acutd; regicmibus carapacis valde pr&mi- 

 nentibus; regione mediand per suturam profundam discretd, postero- 

 laterali tumkld, cardiacd simpliciter rotundato-tiiberculifarmi ; mar- 

 gine carapacis postico medium tuberculo parvulo. Pkdes antici elan- 

 gati, manu carinatd, brachio angulis pustuloso, carpo 3-4 carinato. 



Ovate, nearly unarmed; beak short, lamellar; horns ovato-lanceolate, 

 acute, entire; superior praeorbital spine acute; regions of carapax 

 strongly pronounced; the median region divided from cardiac and 

 lateral by a deep suture; postero-lateral region tumid, transversely 

 indented, and posterior part rising into an obtuse point; cardiac 

 region simply round-tuberculiform ; posterior margin of carapax 

 with a small tubercle at middle. Anterior feet rather long, hand 

 carinate, arm with the angles pustulate, carpus with three or four 

 carinae. 



Plate 2, fig. 2 a, male, natural size; b, under view of head; c, hand; 

 d, female abdomen. 



Oregon, C. Pickering, Exp. Exp. 



Length of carapax, one inch and one line; greatest breadth, eight 

 and a half lines; breadth across prosorbital spines, three lines; length 

 of beak, three and a half lines. 



The outer antennse have the outer angle of first basal joint acute or 

 nearly so, but not produced into a spine ; the second and third joints 

 are flattened and oblong, the third little more than half the length of 

 the second, and its apex not reaching to apex of beak. Pterygosto- 

 mian region with the margin obtusely dentate. Eyes quite small. 

 Legs somewhat pubescent. 



Scyra acutifrons, DANA, Silliman's Ainer. J. Sci., 2d Ser., ix. 269. 



