ox CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. (575 



by the homy muricated bark of the Antipathes, and hence externally is coloured 

 rich brown and covered with little horny spines. The membrane over the valves is 

 very thin, and is with difficulty separated from the Antipathes." But in Oxynaspis 

 patens the little horny spines belong to the cirripede itself, and are a kind of mimicry 

 of the similar spines of the Antipathes. Aurivillius is strongly inclined to believe 

 that in reality the same is the case with Oxynaspis celata. It is clearly true of the 

 new species about to bo described. 



Oxynaspis aurivillii, n. sp. 

 Plate LXXIVc. 



The capitulum and peduncle are beset, though not very closely, with little spines, 

 somewhat similar to those of the host. The peduncle is considerably less than half 

 the length of the capitulum. 



The scuta are between three and four times as long as broad, widest at the 

 middle, the ends rounded, the upper end adjacent to the middle of the tergum, the 

 lower not far from the base of the carina. The terga are semi-oval, about three 

 times as long as broad, the convex margin adjacent to the orifice at its upper end. 

 The carina reaches half way between the terga, is strongly bent at the opposite 

 extremity, and has its apex deeply emarginate. The five valves together leave a large 

 part of the capitulum unoccupied. 



The labrum has a convex margin, smooth in the middle, a little furred at the 

 sides ; the palps are rather narrow, conical, armed with several setae or slender spines. 

 The mandibles are setulose on surface and margins, the distal border consisting of a 

 moderately large separate tooth and a cutting plate divided into four smaller teeth, 

 of which the lowest two are nearer together than the rest, and in one mandible the 

 lowest has a subsidiary denticle outside. The first maxillae are setose on the outer 

 margin, can-y four unequal spines on the blunt outer lobe, and have the broadly conical 

 inner lobe fringed with sjjines of varying slenderness. The second maxillae have their 

 rotundo-quadrate distal margin fringed with slender spines or spinules. The cirri aro 

 nearly as in Darwin's tjq3ical species, with the important exception that the second 

 pair, like all but the first, have the rami apparently of equal thickness. Caudal 

 appendages seem to consist of two little, adjacent rounded plates, and therefore not 

 to be wanting as in 0. patens. The penis is long, and has a tuft of setae on the 

 narrow apex. 



Colour, in spirit, pale, with brown streaks adjacent to lower part of scuta and 

 terga and almig the peduncle. 



Length, :i mm. and sometimes a little over, the capitulum between tw-o and a 

 half and three times the length of the peduncle. 



Habitat. New Britain, taken at 40 fathoms depth. The specimens are firmly 

 attached, at various angles, to the light brown scabrous branches of an Antipatharian. 



The specific name is given out of respect to C. W. S. Aurivillius. By the scuta 

 and terga the new species is easily distinguished from the two earlier members of the 

 genus. 



w. V. 89 



