EEPOET OiSr THE AMPHIPODA. 861 



and third the tooth is well developed, larger in the second than in the third. The fourth 

 pleon-segment is much longer than the two following ; the fifth is shorter than the 

 sixth ; all three are dorsally emarginate. The integument of this handsome species is 

 crustaceous. 



Eyes not made out, perhaps indicated by a somewhat roughened tract on either side 

 of the cephalic carina, but probably absent. 



Upper Antennas. — First joint longer than the head, with a linear, not very straight, 

 carina along the top; the joint is robust, thicker at the base than distally; the second 

 joint equal in length, but less thick ; the third joint but little more than a third the 

 length of the second, distally dilated, and at the lower corner carrying a strong, flat, 

 incurved spine (which possibly represents an accessory flagellum); the flagellum with the 

 first joint longer than the spine just mentioned, bearded ; the following joints numerous, 

 short, closely united, each carrying a small calceolus. The flagellum incomplete, the 

 remaining portion, a little longer than the first joint of the peduncle, contained more 

 than fifty joints. 



Lower Antenna less robust than the upper, with peduncles of about the same 

 length; first joint a little dilated ; gland-cone small; third joint subequal in length to 

 the coalesced first and second ; fourth joint rather longer than the first of the upper 

 antenniB, carrying spines on three edges ; the fifth armed like the fourth, shorter and 

 thinner than that joint, longer than the first three united ; the flagellum with a first 

 joint longer than any of those which follow, these, as in the upper antennae, being short, 

 numerous, and each armed with a small calceolus. The flagellum incomplete, the 

 remaining portion containing seventy joints, those towards the end being longer than 

 those nearer the peduncle with the exception of the first, the whole equal in length to 

 the first four joints of the peduncle. The calceolus is of a peculiar shape in this 

 species ; to the foot-stalk succeeds the usual circular cup, but the distal portion beyond 

 this, instead of being as usual oval, has the distal half of each side cut away as it were, 

 so as to leave a narrow triangular piece with the basal half of the oval projecting in a 

 point on either side. 



Upper Lip liroad and thick, with a flattened space in the centre of an almost semi- 

 circular distal margin, the curve on either side of which has but few cilia, 



MandihJcs. — Cutting plate produced into a long process set round in front with 

 eight or nine teeth, of which on the left mandible the lowest is the largest ; the 

 secondary plate on the left mandible has its edge divided into six teeth, of which the 

 lowest is much the largest ; on the rio;ht mandible the lowest but one of the teeth in 

 the principal cutting plate is the largest, a circumstance not unusual ; the secondary 

 plate is less strong than in the other mandible, somewhat expanded distally, and 

 divided into three teeth, of which the lowest is the longest and is subdivided into two 

 small teeth ; the spine-row shows ten spines on the left, nine on the right mandible, the 



