336 THE VOYAGE OF H.M.S. CHALLENGER. 



extremity of the oplithalmopod. In most other respects the species resembles Benthe- 

 sicymus brasiliensis. 



Length (male), 150 mm. (6 in.) measured from tip of rostrum to extremity of telson. 



Habitat— Station 133, October 11, 1873; lat. 35° 41' S., long. 20° 55' W.; in the 

 South Atlantic, near Tristan da Cunha; depth, 1900 fathoms ; bottom, Globigerina ooze ; 

 bottom temperature, 35°"4. Two specimens; the larger is a male, the smaller, which is 

 a female about 50 mm. in length, is more slender, but I take it to be a younger specimen 

 of this species. Trawled. 



Benthesicymus altus, Spence Bate (PL LVIII. fig. 1). 

 Benthesicymus altus, Sp. B., loc. tit., p. 191. 



Eostrum short, compressed, thin, apex styliform, crest armed with two teeth and 

 terminating at the cervical fossa, which is clearly marked. The posterior three somites 

 of the pleon are much compressed, and the last is dorsally furnished with a small but 

 decided carina. The males are like the females, but with the dorsal ridge on the fifth 

 and sixth somites produced to a minute tooth at the posterior extremity. Telson half 

 the length of the outer branch of the rhipidura, sides laterally compressed, posterior 

 half armed with three small distant spines. 



Habitat.— Station 184, August 29, 1874; lat. 12° 8' S., long. 145° 10' E.; between 

 Australia and New Guinea; depth, 1400 fathoms; bottom, Globigerina ooze; bottom 

 temperature, 36°. One specimen, associated with a smaller one closely resembling 

 Benthesicymus brasiliensis. Trawled. 



Length (female), 120 mm. (4"75 in.). 



Station 214, February 10, 1875; lat. 4° 33' N, long. 127° 6' E.; south of the 

 Philippines ; depth, 500 fathoms ; bottom, blue mud ; bottom temperature, 41° - 8. Three 

 males. Dredged. 



Length, 63 mm. (2 "5 in.). 



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°. Trawled. 



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

 dec Islands ; depth, 600 fathoms ; bottom, hard ground ; bottom temperature, 39°'5. 

 Numerous specimens. Trawled. 



Station 174c, August 3, 1874; lat. 19° 7' 50" S., long. 178° 19' 35" E.; off 

 Kandavu, Fiji; depth, 610 fathoms; bottom, coral mud; bottom temperature, 39°. A 

 sickly-looking specimen, destitute of scaphocerite and rostrum. Trawled. 



Station 205, November 13, 1874; lat. 16° 42' N., long. 119° 22' E.; Philippine 

 Islands; depth, 1050 fathoms; bottom, blue mud; bottom temperature, 37°"0. One 

 female. Trawled. 



