REPOET ON THE CEUSTACEA MACEURA. 849 



The two anterior pairs of pereiopoda are chelate and subecpial. The two following 

 have the meros subcylindrical and terminate in a styliform dactylos, that of the posterior 

 pair being short and stunted. 



Habitat.— Station 104, March 23, 1873; lat. 2° 25' N., long. 20° 1' W.; Atlantic; 

 depth, 2500 fathoms; bottom, Globigerina ooze; bottom temperature, 36°*6. One 

 specimen, female with ova. Trawled. Length, 50 mm. 



Station S7, July 21, 1873 ; lat. 25° 49' N., long. 20° 55' W.; near the Canary Islands ; 

 depth, 1675 fathoms ; bottom, rock. One specimen, male. Dredged. Length, 

 62 mm. 



Station 133, October 11, 1873; lat. 35° 41' S., long. 20° 55' W.; near Tristan da 

 Cunha ; depth, 1900 fathoms; bottom, Globigerina ooze; bottom temperature, 35°"4. 

 Two specimens ; one male (damaged), one female. Trawled. 



Station 156, February 26, 1874 ; lat. 62° 26' S., long. 95° 44' S.; depth, 1975 fathoms; 

 bottom, Diatom ooze. One specimen, male. Trawled. Length, 25 mm. 



Station 157, March 3, 1874; lat. 53° 55' S., long. 108° 35' S.; depth, 1950 fathoms; 

 bottom, Diatom ooze; bottom temperature, 32°'l. Two specimens, males. Trawled. 

 Length, 70 mm. 



Station 318, February 11, 1876; lat. 42° 32' S., long. 56° 29' W.; depth, 2040 

 fathoms ; bottom, blue mud ; bottom temperature, 33°'7. One specimen, female. 

 Trawled. Length, 50 mm. 



The carapace is slightly depressed between the gastric and cardiac regions, slightly 

 arcuate over the gastric region, and in the median line compressed to a ridge that is 

 adorned with four small denticles, posterior to the rostral point, which does not reach as 

 far as the distal extremity of the ophthalmopoda ; from the extremity at the base of the 

 small rostral projection, the frontal surface abruptly descends and unites with the metope, 

 and does not carry a small tooth as in ILjmenodora glauca, being smooth throughout. 



This species differs from Hymenodora glauca most conspicuously by having no 

 denticle on the metope beneath the rostral tooth, and by the last two joints of the 

 second pair of gnathopoda articulating with the preceding joint at the extremity, instead 

 of on the under surface. 



Observations. — It appears to be very commonly distributed, since it has been taken 



(ZOOL. CHALL. EXP. PART LII. — 1887.) Fff 107 



