STALK-EYED CRUSTACEA 109 



terminal joint, bristle with very large and sharp spines, 

 forming one row above and two below. 



Length, from two to three inches ; colour, grey, test 

 having the appearance of a rough stone. 



Range. — Barbados. 



3. Solenolambrus. 



Solenolavibnis . . . Stimpson, A, Milne Edwards, 



Miers. 



Carapace pentagonal, more or less broader than long. 

 The posterior side of the pentagon is the shortest, the 

 other four are about equal. The margin is acute on all 

 sides, forming a slight crest. The upper surface is naked, 

 glossy, strongly convex, and has four protuberances, one 

 gastric, one cardiac, two branchial. The gastric and 

 cardiac ones are triangularly pyramidal, and the branchial 

 one has an acute ridge running obliquely to the postero- 

 lateral margin of the carapace. Frontal region is slightly 

 convex, and there is no protuberance on the orbital region. 

 Orbits round, upper margin entire and smooth. The 

 rostrum is short, blunt, or faintly tridentate. The basal 

 joint of external antenna; is about as long as the next 

 joint. The epistome is concave. From the antero- 

 external angle of the buccal area a sharp ridge extends 

 to the outer base of the first pair of legs, separating 

 the concave pterygostomian from the subhepatic region, 

 which is also concave and channel-like. When retracted 

 the extremity of the hand covers the pterygostomian 

 region, forming the efferent passage. The external 

 maxillipedes fit accurately the buccal area, and the 

 external appendage is concave, forming part of the wall 

 of the channel ; the fourth joint has a prominent antero- 

 external angle, its surface is concave towards the antero- 



