MAI IDE A. 117 



in its prominent praeorbital spine, and also in having the outer an- 

 tennae properly exposed, although usually lying inward under the 

 beak. The species are still nearer Halimus in form and structure, 

 but the four posterior legs have the penult joint cylindrical. The 

 surface is smooth or nearly so ; there are traces of two distant tuber- 

 cles in the same transverse line on the median region, similar to those 

 of some Epialti. 



PlJGETTlA GRACILIS. 



Carapax lyratus, paulo convexus, latus, pone oculos utrinque largd trian- 

 gidato-expansus cum angulo acuto, margine postero-laterali spina 

 crassd armato, latitudhie ante-mediand vix rninore quam latitude post- 

 media na, regione mediand tumidd, minute bituberculatd. Pedes antici 

 crassi, longi, brachio supra carinato, dentato, carpo bicarinato, digitis 

 fere omnino contiguis. Pedes octo postici nudiusculi, articulis 3tio 

 htoque subcarinatis, 4fo dorsum depresso, 5to versus apicem inferiorem 

 penecillum setarum brevissimum ferente. 



Carapax lyrate, somewhat convex, broad ; on either side behind the 

 eyes a large triangular expansion with angles acute ; outer margin 

 of postero-lateral region armed with a stout spine ; gastric diameter 

 but little less than the cardiac. Beak setigerous, horns somewhat 

 divaricate. Medial region tumid, minutely tuberculate, and ante- 

 rior to each tubercle a series of curled setae. Anterior feet stout 

 and long, arm carinate above and dentate, carpus bicarinate, 

 fingers mostly contiguous within. Eight posterior feet nearly 

 naked, third and fifth joints subcarinate, fourth depressed on 

 upper side, fifth with a short pencil of setae below, towards apex. 



Plate 4, fig. 3 a, male, natural size ; b, under view of head, enlarged 

 four diameters; c, abdomen of male, natural size. 



Puget's Sound. 



l o 



Length of largest specimen seen, a female, one inch and four lines ; 

 breadth across from angle to angle of projection behind the eyes, ten 

 and one-fourth lines ; breadth across from tip to tip of lateral spine, 

 eleven and one-fourth lines ; length of beak, nearly four lines ; length 



30 



