CRANCH'S EBALIA. 149 



the male nearly twice as long as the carapace ; the arm is 

 somewhat trihedrons, and three times as long as it is 

 broad ; the wrist ovate, the hand slightly tumid, the fingers 

 shorter than the hand ; the remaining pairs of legs slender, 

 the second and third pairs in the male one-third longer 

 than the carapace. In the female the carapace is. in pro- 

 portion, a little longer than in the male, and the legs con- 

 siderably shorter. The abdomen in the male has the third, 

 fourth, and fifth joints, and the female the fourth, fifth, and 

 sixth, united ; in the former the penultimate joint is emar- 

 ginate in the anterior margin to receive an angular projec- 

 tion in the posterior margin of the terminal joint. 



Length of the carapace half an inch. Colour yellowish 

 red, the female paler. 



The male of this species so nearly resembles that of E. 

 Bryerii, that without very careful examination they may 

 very readily be mistaken for each other. The principal 

 distinctive characters are to be found in the form and pro- 

 portions of the arm, and the size of the granulations on 

 the surface. The arm in E. Cranchii is three times as long 

 as it is broad, and without any dilatation or protuberance 

 on the inner side ; in E. Bryerii the arm is scarcely twice 

 as long as it is broad, and is furnished with a distinct pro- 

 jection on the inner side. In E. Cranchii the granulations 

 which cover the surface of the body and limbs are distinct 

 and somewhat prominent ; in E. Bryerii they are very 

 small, and depressed. The female in the present species 

 very nearly resembles the male ; in E. Bryerii the sexes 

 are very dissimilar. 



This is the most rare of the British species of Ebalia. 

 It was discovered by the indefatigable and unfortunate 

 Cranch, in Plymouth Sound, where it was afterwards ob- 

 served, according to Dr. Leach, in considerable numbers ; 



