316 



CARL BOVALLIUS, AMPH1PODA IiYPEKIIDEA. 



. 2. IIYPERIID^E. 



TliemhteHa Steenstrupi. 



on the lower part of the outer margin; the rami are elongate, nearly equal in length, and 

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

 peduncle, with 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 third pair is 

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

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

 rated as in the first pair. 



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

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

 peduncle of the last pair of uropoda. 



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



Themistella fusca, Dana. 



Facsimile from Dana, U. S. Expl. Exp. Crust, pi. 67, fig. 8. 



Fig. 1. The animal from the side. 2. The flagellum of the first pair of antenme. 3. The varus. 



Diagn. 



Caput duplo altius quam longius, segmentis quattuor primis perrci longius. Segmenta omnia 

 peraii libera, segmentum primum brevissimum. Metacarpus pedum peraii primi paris carpo 

 baud longior(?). Pedes secundi paris diinidio pedum tertii paris breviores. Pedes sexti 

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

 Segmentum secundum et tertium uri libera. Ramus internus pedum uri tertiam partem 

 pedunculi longitudine aequans; ramus externus internum longitudine eequans. Telson tri- 

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

 ejusdem longius. 



Tbe head is twice as deep as long, and is longer than the first four pergonal segments to- 

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

 carpus of the first pair of pcrceopoda is not longer than the carpus(?). The second pah- 

 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 pleoual segments are angular behind. The second and 



