REPORT ON THE CRUSTACEA MACRURA. 7f>3 



generally more robust ; they may be only sexually distinct from each other, and, since 

 they were taken in the same haid together, it is difficult to believe they are more than 

 varieties of the same species. 



This species resembles Acanthcphyra hingsleyi, which may, however, be distinguished 

 from it by having only four teeth on the upper margin of the rostrum, which is also 

 proportionately longer, by the peduncle of the first pair of antennse being shorter 

 than the rostrum, and by the presence of a strong tooth on the posterior margin of the 

 third somite. 



Acanthephyra brachytelsonis, n. sp. (PL CXXVI. fig. 7). 



Eostrum a little longer than the carapace, obliquely elevated, armed on the upper 

 surface near the base with six small teeth, from which point it is smooth to the apex, 

 the lower margin has one tooth about one-third its length from the apex, and two near 

 together about one-third from the base of the rostrum. The third somite of the pleon 

 is posteriorly produced to a long tooth, which reaches to about three-fourths the length 

 of the next somite when the animal is extended, at which point a small depression marks 

 its limit. The two succeeding somites are posteriorly produced to a point, but scarcely 

 sufficient to be called a tooth ; and the sixth is produced to a small one. The telson 

 is smooth and shorter than the outer plates of the rhipidura. 



Habitat.— Station 170, July 14, 1874 ; lat. 29° 55' S., long. 178° 14' W.; off the 

 Kermadec Islands ; depth, 520 fathoms ; bottom, volcanic mud ; bottom temperature, 

 43°. Four specimens ; three males and one female. Trawled. 



Station 170a, July 14, 1874; lat. 29° 45' S., long. 178° 11' W.; north of the Kermadec 

 Islands ; depth, 630 fathoms ; bottom, volcanic mud. Four specimens. Trawled. 



Length 75 mm. 



Station 171, July 15, 1874 ; lat. 28° 33' S., long. 177° 50' W.; north of the 

 Kermadec Islands ; depth, 600 fathoms ; bottom, hard ground ; bottom temperature, 

 39° -5. One specimen. Trawled. 



Length, 65 mm. 



Station 194, September 29, 1874; lat. 4° 34' K, long. 129° 57' 30" K; off Banda 

 Island ; depth, 200 fathoms ; bottom, volcanic mud. Two specimens. Trawled. 



(ZOOL. CHALL. EXP. PART LII. — 1887). Fff 95 



