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PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 37. 



the segment, gradually becoming wider from the first to the last, and 

 all with the posterior extremity rounded, sac-like. 



The abdomen is immersed in the seventh thoracic segment. The 

 first four segments are about equal in length, each being about 1 mm. 

 long; the fifth segment is a little longer, being mm. in length. 

 The sixth or terminal segment is a little wider than long, 7 mm. : 8-J 

 mm. It is posteriorly rounded. The uropods are equal in length, 

 the inner one being a little wider and both rounded posteriorly. They 

 do not reach the extremity of the terminal segment. The outer 

 branch is 1 mm. wide and a little over 3 mm. long. 



All the legs are prehensile; the basis of the last four pairs is 

 furnished with a very low carina. 



Only one adult female comes from station 4957, having been col- 

 lected on the way from Kagoshima, Kagoshima Gulf, Japan, to 

 Kobe, Japan, by way of Bungo Channel and Inland Sea at Mizimoko 

 Shima Light N. 22° W., 29 miles (lat. 32° 36' N.; long. 132° 23' E.), 

 at a depth of 437 fathoms, in greenish-brown mud, fine gray sand, 

 and foraminifera. 



Three young females and two males were collected at station 5044, 

 on the south coast of Hokkaido, at lat. 42° 10' 40" N., long. 142° 

 14' E. (approximate position), at a depth of 309 fathoms. They 

 are from the mouth cavity of Synaphobranchus. 



The males differ from the females in the presence of eyes, the 

 longer antennae of the first and second pairs, the first extending to 

 the middle of the first thoracic segment, the second to the posterior 

 margin of the first thoracic segment, and in the narrower and 

 smaller body. The second antennas in the young female are also a 

 little longer than in the adult. 



Type-specimen.— Cat. No. 39503, U.S.N.M.' 



LIVONECA EPIMERIAS, new species. 



Body of adult female, elongate-ovate, almost twice as long as wide 

 (15 mm.: 29 mm.). Surface smooth. Color, in alcohol, dark yellow. 



Head almost as long as wide (3 mm. : 4 mm.). Anterior margin 

 widely rounded. Eyes small, distinct, and placed in the lateral 

 angles. Posterior margin of head also rounded. First pair of 

 antennae, composed of eight articles, extend to the antero-lateral 

 angles of the first thoracic segment. Second pair of antennae, com- 

 posed of seven articles on one side and eight on the other, extend 

 one-third of the lateral margin of the first thoracic segment. 



The first segment of the thorax is 3^ mm. long, the second 2f mm. 

 long, the third 2| mm., the fourth 3 mm., the fifth and sixth each 2f 

 mm., the seventh 2 mm. All the segments are furnished with distinct 

 epimera with the exception of the first. They are in the form of 

 narrow plates, except the last, which are very broad. All, except 



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