AMPIIIPODA — STKBHINO. 619 



jointed, whereas in no other species have more than seven joints 

 been assigned to that appendage. 



SIPHONCECETES AUSTRALIS, sp.nov. 



(Plate ]vi.). 



Stations 13, 37. 



Animal, as extracted from its Deutalimn liabitation, straight 

 as far as the last peraeon segment, with which the curvature 

 commences for the close ventral infolding of the terminal pleon 

 segments. Head longer than an)'^ segment of the peraeon, pro- 

 duced with a rounded process rather than a rostrum between the 

 projecting eye-lobes. 



Eyes small, dark in preserved specimens, with very few com- 

 ponents. First antenuEe about as long as head and peraeon 

 combined, first joint a little longer than third but shorter than 

 second, w4iich is almost as long as the six-jointed ilagellum. In 

 this the sixth joint is minute, and the first notably shorter than 

 any of the four following joints. In the second antennee the first 

 tw^o joints are short. The three following have the relative pro- 

 portions, 10, 24, 29, the last two together equalling the length of 

 the first antennse. In the same proportion the three-jointed 

 flagellum would be represented by the number 12 ; it has none of 

 the uncinate spines found on the lateral margins in S. orientalis, 

 but one apical curved spine on the second joint and two such 

 spines on the third ; a female specimen has first antennae reaching 

 end of peduncle of second antennae. 



In the mouth-organs no distinctive character was observed 

 apart from those assigned to the genus, in which the one-jointed 

 palp of the mandible is most exceptional. 



The first gnathopods have the side-plate somewhat quadrate 

 with acute front angle, the fifth joint a little shorter but broader 

 than the sixth, which has a very oblique palm scarcely distinct 

 from the hind margin except by a large defining spine followed 

 by two others successively smaller ; the curved finger has nine 

 little teeth on the inner margin, the largest near to the nail. 



The second gnathopods have the front corner of the side-plate 

 rounded. The triangular fifth joint is distally as broad as the 

 joint is long, the sixth joint is scarcely so long as that of the first 

 pair but broader, the palm defined by a long spine, which is 

 succeeded by four others .successively smaller along the crenulate 

 hind margin. The curved finger has about six little teeth on its 

 concave margin. 



The peraeopods are scarcely distinguishable from those of -S". 

 colletti, Boeck. In the first and second pairs the much expanded 



