REPORT ON THE AMPHIPODA. 1209 



Outer plates of the Maxittipeds not reaching beyond the middle of the palp's second 

 joint. 



Hands of both pairs of Gnathopods subchelate, not linear. 



The Third Uropods with long equal or subequal rami. 



The generic name is that of an Armenian king, of whom an account ma}' be found in 

 Gibbon's Decliue and Fall of the Roman Empire. 



Chosroes incisus, n. sp. (Pis. CXXXIV., CXXXV.). 



Rostrum minute ; body broad-backed, especially at the centre of the perseon, thence 

 narrowing towards the pleon, the last three segments of which are ventrally flexed ; the 

 fifth segment of the pleon shorter than the sixth. 



Eyes broadly oval, with many scores of narrow ocelli ; their position is close to the 

 lower margins of the head, and very near the two lateral points where the front margin, 

 which is concave on each side of the rostrum, joins the convex lower margins. 



Upper Antennae. — The first joint much thicker than the second, not so long as the 

 second and third united, with a small spine on the lower apex ; the second joint longer 

 and thicker than the third ; the flagellum much longer than the peduncles, with thirty - 

 four joints remaining, the joints not long, widening a little distally, each having several 

 small narrow calceoli, at intervals armed with groups of long and broad cylinders ; the 

 second and third joints of the peduncle likewise having calceoli, there being not fewer 

 than a dozen round the apex of the third joint ; the appearance presented by the calceoli 

 being as if four stalked cups were planted one within the other, the basal cup smaller 

 than the next, and the two following smaller than the basal. 



Lower Antennae. — The first two joints very short, the third also short, widening 

 distally, the fourth longer than the third, and the fifth than the fourth, all three having 

 a few spines and small calceoli ; the flagellum stout, with twenty-four short broad joints 

 remaining, furnished with small calceoli. 



Upper Lip. — Distal margin evenly convex, as observed in the small specimen. 



Mandibles. — The cutting edge angled, divided into seven teeth ; the secondary plate 

 of the left mandible divided into a row of five teeth, the plate on the right mandible 

 smaller, appearing in profile to have two narrow teeth, but in a broadside view rather to 

 end in two laminae, one much wider than the other ; the spine-row of five spines ; the 

 molar tubercle prominent, with long teeth round the dentate crown, cilia on the side, and 

 a plumose seta ; there is a process near the base of the palp, such as is found in so many 

 genera; the palp very large, the first joint short, the second both broad and long, 

 with many spines along the front margin, including five in a row near the base, of 

 which the uppermost is the longest, and a group of about fifteen set in a curve on the 

 distal part of the outer surface, the central the longest ; there are others between these 



(ZOOL. CHALL. EXP. PART LXVII. 1888.) Xxx 152 



