IIYrKKID.E. 



2'J: 



Collected several specimens on April ~), 1839, somc'of which were in 

 the water-cavity of *S«/^»<»-. Also between New Zealand and New 

 Holland."— i)rtHa. 



The ubove description so closely resembles that of Leatriyonus 

 Ga ltd icha tali i, that I shoiild liave united them, had not Dana de- 

 scribed the dagella of this species as being uniarticiilato. 



6. Hyperia trigona. (I'late XLIX. fig. 4.) B.M. 



Ilyperia trigona, iJu/ui, U. S. Esplur. Expvd. p. 987. pi. 07. f. 12. 



Cephidon ovate, not large. Superior antenntc as long as the cephalon 

 is deep, subulate. Inferior antenna? " reaching nearly to the fomlh 

 segment of the pcreion, very slender ; flagellum indistinctly arti- 

 culated*." Gnathopoda very short : fii-st pair having the caqnis 

 scarcely produced interiorly ; propodos tapering ; dactylos short : 

 second pair having the meros inferiorly produced ; carpus infero- 

 anteriorly produced to two-thirds the length of the propodos ; 

 dactylos short and straight. First two pairs of pereiopoda sub- 

 equal, slender, having the carpi broad and setose ; three posterior 

 pairs miich longer than the two preceding, having the propoda 

 very long, nearly half the length of the whole, anteriorly fringed 

 with fine cilia, which in the third pair are long, thickly packed, 

 and comb-like, but sparsely existing on the fourth and iifth pairs. 

 Peduncle of the antepenultimate and penultimate paii's of pleojjoda 

 reaching to half the length of that of the ultimate ; rami of the 

 penultimate pair unecpial, and longer than those of the preceding 

 pail's : ultimate pair having the pedimcle thi'ec or four times as 

 long as the telson ; rami uneiiual, slender, smooth, nearly one-half 

 the length of the peduncle. Telson obtusely triangidar, scarcely 

 as long as broad. 



Length ^'^^ths of an inch=" G-8 lines " (Dana). 



Hah. Probably fnjm Lagullias Bank, near Cape Horn {Dana) ; 

 Antarctic regions. 



The peculiar form of the i)ereion (which Dana saj-s is " very much 

 compressed, the back rising to an edge ") 1 attribute to accident, 

 such as to pressure by the hand when first caught, since in every 

 other respect the details of the specimens collected in the Antarctic 

 expedition, and jjresented to the British Museum by tlu- Admiralty, 

 correspond exactly Avith Dana's description and figure. No species 

 in any genus of this family, that I am aware of, has a dorsal 

 carina. 



* T have quoted tlic description of tlu' inferior nn)enn;e from Diinn, boenuse 

 the (lnt,'<-lhini in wanting bevoncl tlie iirst long articiilns in the specimen iji the 

 British Museum. 



