120 S. I. Smith on new Crustacea from N. America. 



tion -which is covered to the lateral margin with low squamiform 

 tubercles ; depression between the median and lateral crests 

 broad and deep, smooth or slightly punctate, with a median 

 line of four depressed tubercles ; lateral margin broken by a 

 deep fissure at the cervical suture, and by a slight one a little 

 more posteriorly. Antipenultimate segment of the antennas 

 as broad as long ; anterior angle not prominent ; outer margin 

 arcuate, bidentate ; anterior margin armed with several denti- 

 cles ; median carina prominent but smooth and even ; terminal 

 segment short, the extremity almost truncate and rather deeply 

 five-lobed, the lobes rounded ; the inner margin bidentate. 

 Exposed portions of the abdominal segments sculptured as if 

 covered with rows of scales ; fourth segment with a prominent 

 median elevation above. Feet nearly naked ; the merus seg- 

 ments slightly carina ted above. Length, 1*45 in. ; length of 

 carapax, along the median line, '45, lateral margin, -50 ; 

 breadth, anteriorly, "49. Male and female do not differ. 



Several specimens from Egmont Key, west coast of Florida, 

 collected by Col. E. Jewett and William T. Coons. It is spe- 

 cially interesting as the representative of a genus hitherto 

 known only from the old world. 



JEthra scutata, sp. nov. 



Carapax transversely and regularly elliptical ; margins thin, 

 slightly dentate, the denticles separated by broad and very 

 shallow sinuses ; posterior margin nearly straight in the mid- 

 dle ; anterior margin straight and parallel to the posterior 

 margin for a short space outside the eyes ; front projecting 

 horizontally, its margin forming a semicircle ; gastric region 

 elevated, with a broad median depression extending to the 

 front ; anterior lobe of branchial region large and prominent ; 

 the broad space between the branchial region and the antero- 

 lateral margin concave ; summits of the elevations and a space 

 along the posterior border tuberculose, rest of the upper surface 

 smooth ; inferior lateral regions slightly convex and smooth. 

 Chelipeds fitting closely to the carapax ; the angles projecting 

 into dentate crests ; outer and inferior surface of the hand 

 coarsely granulous. Ambulatory legs short ; the angles pro- 

 jecting into thin, dentate crests. Sternum and abdomen deeply 

 vermiculated. Length of carapax, T39 in. ; breadth, 2'23. 



A single male of this species, the first of the genus dis- 

 covered in America, was sent with the Evibacus from La Paz 

 by Capt. Pedersen. It is at once distinguished from 2E. scru- 

 posa Edw., by the much broader and more regularly elliptical 

 carapax. 



The genus JEthra should evidently be placed near Crypto- 



