162 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 43. 



The abdomen consists of a single large segment, which measures 4.5 

 mm. in length. At each post-lateral angle is a long spine, 1.5 mm. in 

 length, produced straight backward and about two-thirds the length 

 of the lateral margin is a small spine on either side. The posterior 

 margin is produced in the middle in a small triangular process. The 

 uropoda consist of a long peduncle, 3 mm. in length, or twice as long 

 as the post-lateral spines, and a single branch which is 1.5 mm. in 

 length. 



All the legs are broken at the basis with the exception of one leg of 

 the first pair, and this is the only one preserved (see fig. 4) ; it is pre- 

 hensile, with 13 spines on the propodus and 5 on the merus; there is 

 also one long spine on the carpus about the middle of the inner margin. 



A single imperfect specimen, the body being in two parts, was 

 found by the U. S. Bureau of Fisheries steamer Albatross at station 



2807, off Chatham Island, Galapagos Islands, 

 at a depth of 812 fathoms in globigerina ooze, 

 coral, and mud. 



Type-specimen. — Cat. No. 43695, U.S.N.M. 

 This species is very close to Munnopsis 

 latifrons Beddard from off Ino Sima Island, 

 Japan. It differs, however, from that species 

 as described and figured by Beddard in not 

 fig. 4. — Munnopsis longiremis. having the posterior margin of the terminal 

 first leg. x io£. segment of the body truncate, but produced in 



a small triangular process, in having the post-lateral spines of this seg- 

 ment much longer than in that species and in having a greater number 

 of spines on the propodus of the first pair of legs. The spine on the car- 

 pus is also situated halfway between the posterior and the anterior end 

 of the article, while in M. latifrons it is situated closer to the anterior end. 



The specimens referred by me to M. latifrons in 1909 differ from that 

 species in having the posterior margin of the abdomen produced in a 

 triangular process between the post-lateral spines, which are more 

 divergent than in Beddard's specimens. There are also two smaller 

 spines on the lateral margin on either side not seen in Beddard's speci- 

 mens. These specimens may have to be referred to a new species. 



LIST OF REFERENCES. 

 Beddard, F. E. Report on the Scientific Results of the Voyage of H. M. S. Challenger 

 during the years 1873-1876. Zool., vol. 17, pt. 48. Report on the Isopoda (pt. 2) 

 1886. London. 



Hansen, H. J. Reports on the dredging operations off the west coast of Central 

 America to the Galapagos Islands, to the west coast of Mexico, and in the Gulf of 

 California, in charge of Alexander Agassiz, carried on by the U. S. Fish Commis- 

 sion steamer Albatross during 1891, Lieut. Commander Z. L. Tanner, U. S. Navy, 

 commanding. Vol. 22, The Isopoda. Bull. Mus. Comp. Zo6l. Harvard College, 

 vol. 31, No. 5, 1897. Cambridge. 



Richardson, Harriet. Isopods collected in the Northwest Pacific by the U. S. 

 Bureau of Fisheries steamer Albatross in 1906. Proc. U. S. Nat. Mus., vol. 37, 

 1909, pp. 75-129. Washington. 



