REPORT ON THE CRUSTACEA MACRURA. 



400 



Pontocaris pennata, n. sp. (PL XCL). 



Carapace broader anteriorly than posteriorly ; frontal antennal margin obliquely 

 extended outwards and forwards ; dorsal and lateral surfaces longitudinally traversed by 

 seven carinas, of which the three dorsal are multidenticulate and converge anteriorly, the 

 supra-lateral denticulate anteriorly, and the infra-lateral smooth. 



The rostrum usually two-pointed, or bifurcate. 



There is no tooth on the ventral surface of the pereion between the third pair of 

 pereiopoda. 



Telson Ions; and slender. 



Habitat.— Station 190, September 12, 1874 ; lat. 8° 56' S., long. 136° 5'E.; Arafura 

 Sea, south of Papua ; depth, 49 fathoms ; bottom, green mud. Three specimens ; 

 two females, one male. Trawled. 



The rostrum is short, bidentate at the apex, and supported by a small tooth on 

 each side at its base. The carapace is traversed longitudinally by seven carinse. The 

 median carina commences on the gastric region, or a short distance behind the rostrum, 

 and is armed with a row of eight bead-like cusps continuing to the posterior margin. 

 The second, or the first on each side of the median carina, is slightly curved outwards ; 

 it commences immediately behind the orbit, and extends to the posterior margin of the 

 carapace, and supports nine small teeth, the four anterior being a little longer than the 

 five posterior. The next or third carina forms on each side the dorso-lateral angle of 

 the carapace, and commences in a large, obliquely directed, wing-like process on the outer 

 side of the orbit, behind which are two small pointed teeth which are separated by a 

 notch from other two behind, whence the carina runs as a smooth ridge to the posterior 

 margin of the carapace. Beneath this, on each side on the infra-lateral surface, is the 

 fourth carina, which commences in a tooth just beneath the outer orbital angle, it is 



