r. _ 



_XI. _■- ,-,^ 



l" ^^'■^-- ^X 



Tt!T!i^.^<:aiJ^r?'^ 



.r<:g|i J^ r ? -^ .<" iprtf ,v 



-^ "j- J- -1 



K 



> 





I- 



i. 





I 



SERGESTES INOUS. 



209 



of antenna) ; the eyes are black and small, not exceeding the eye-stalks in 

 diameter. The first segment of the antenmdar peduncle is somewhat shorter 

 than Ihe second ; the second and third segments are about equal in length. 

 Tlie second segment of the antenna is unarmed ; the scale is broad to the 

 tip, and reaches a little way beyond the proximal end of the third segment 

 of the antennular pcdimcle. The second pair of maxillipeds are robust and 

 reach forward to the distal end of the proximal segment of the antennular 

 peduncle. The third maxillipeds and the third pair of legs are the longest 

 of the appendages ; they are subequal in length, reaching much beyond the 

 distal end of the antennular peduncle. The second and third pairs of legs 

 are furnished with a rairmte terminal chela, the fingers of which are tipped 

 with a brush of settc. There is a tuft of setae at the distal end of the inferior 

 margin of the carpus, corresponding to a similar tuft near the proximal end 

 of the propodite. The penultimate pair of legs are about as long as the 

 carapace ; they are tiatteued and furnished with long cilia, as is customary 

 in this genus. The posterior pair of legs is wanting in the only specimen 



obtained. 



The abdominal appendages are very long, diminishing in length poste- 

 riorly. The external branch of the caudal fin or swimmeret appears to l^e 

 without an external spine, but an angle in the outer margin, one quarter of 

 the way from the distal end, marks the position of the spine commonly found 



on this appendage. 



Length, 113 mm. ; carapace, 34.5 mm. 

 Station 3380. 899 fathoms. 1 female. 



r 



The branchial organs are arranged as follows : — 



Somite 



VII. VIII. 



IX, 



X. 



XI. 



XII. XIII. XIV, 



Pleurobraiichia3 + ^ 1 + / 1 + ^ 1 + ^ 



ArtlirobrancliiiB 

 Podobrancliiaj 1 

 Epipods 



1 1 





 

 





 

 









 



2 

 

 

 



2 

 

 

 





 







=1 

 = 



(2) 



8 + 4 / + (2) 



■ 



•i 



In the above formula the letter / stands for the simple lamella which 

 represents the second pleurobranchia on the eighth to the eleventh somites. 

 The plcurobranchioc of the tenth and eleventh, and the anterior pleuro- 

 branchia of the twelfth, somite are of about an equal size, and are the 

 largest of all the gills. The posterior pleurobranchia of the twelfth somite 

 (Plate LI., Fig. 2", pi'.), though smaller than the anterior, is perfect in form 



27 



