316 



CAKL BOVALLIUS, AMI'llir()])A JIYPKHIIDKA. 



I. 2. 



llYPKKUDiE. 



ytetlu Steenstvupi. 



011 tlie lower part of the outer margin; tlie raini are elongate, nearly equal in length, and 

 provided with semicircular incisions near the base; the inner ramus is half as long as the 

 peduncle, ^\■ith the inner margin smooth, and the outer serrated. The second pair reach 

 nearly to the middle of the outer ramus of the last pair. The peduncle is more than 

 four times as long as broad, and fully twice as. long as the inner ramus, which is longer 

 than the outer; the rami are armed as in the first pair. The peduncle of the ^/iirrf|5ai> is 

 broader than in the preceding pairs, not fully four times as long as broad, and quite three 

 tiraes as long as the inner ramus, -which is rather shorter than the outer; both are ser- 

 rated as in the lirst pair. 



The telson is rounded, as long as broad, and morc than half as long as the last 

 coalesced ural segment; it is narrower than, and scarcely a iifth part as long as, the 

 peduncle of the last pair of uropoda. 



2. THEMISTELLl FUSCA, J. D. DANA, 1852. 



Tliemistella fusca, Dana. 

 Facsimile from Dana, U. S. Expl. Exp. Cmst. pl. 67, fig;. 8. 

 Ti"ig. 1. Tlie iuiimal from tlie side. 2. The flagellum of the first pair of antemuie. 



•j/jriot;-. 



3. The urus. 



Diagn. Ccqjut duplo altius quam longius, segmeritis qiiattuor primis persei longius. Segmenta omnia 

 percei libera, segmentum primura brevissimum. Metacarpus pedwn percei primi paris carpo 

 haud loDgior(?). Pedes secundi paris dimidio pedum tertii paris breviores. Pedes sexti 

 paris pedibus septimi paris paullo longiores. Latera segmentorum plei post angulata. 

 Segmentum seciindum et tertium uri libera. Eamus internus pedum uri tertiam partem 

 pedunculi longitudine fequans; ramus externus internum longitudine ajquans. Telson tri- 

 angulatum, pedunculo pedum uri ultimi paris latius, et quarta parte longitudinis pedunculi 

 ejusdem longius. 



The liead is twice as deep as long, and is longer than the first four perseonal segments to- 

 gether. All the perceonal segments are free; the first segment is very short. The meta- 

 carpus of the first pair of perceopoda is not longer than the carpus(?). The second j)air 

 are not half as long as the third pair. The sixth pair are only a little longer than the 

 seventh. The lateral parts of the pleoncd segments are angular behind. The second and 



