ISOPODS OF NORTH AMP^RICA. 



301 



Fk;. 329.— Dynamene 

 BENEDicTi. Last 



THORACIC SEGMENT 

 AND ABDOMEN. X 

 13}. 



first joint of peduncle longest; second and third joints about equal in 



length; flagolluin consists of six joints. Second pair of antennte 



extend to the po.sterior margin of the second thoracic 



segment; flagellum consists of about elcvcMi joints. 

 The thoracic segmcMits are of equal l(Migth. The 

 epimera are square with rounded pos- 

 terior angles. 



The penultimate abdominal segment 

 is crossed b\' suture lines, indicative 

 of coalesced segments. The terminal 

 segment is triangular, terminating pos- 

 tei'iorly in two teeth separatt^d by a 

 narrow, round(>d, fu(ui<>l-shaped sinus. This segment is 

 very convex, and ])ears two longitudinal ridges on either 

 side of the median line. The uropoda do not exceed in 

 length the extremity of the terminal segment. Both 

 l)ranches are rounded posteriorly and are similar in 

 shape and size. 



The type was collected by Mr. Heath at Monterey Bay, 

 California, at the surface. Cat. No. 22570, U.S.N.:\I.^ 

 This species is named for Dr. James E. Benedict, 



assistant curator in the Division of Marine Invertebrates. U. S. 



National Museum. 



Both sexes of this species are known, and are in the collection of 



the U. S. National Museum. The male and female are alike in every 



respect, with the exception that the inner branch of the pleopoda in 



the male is provided with a stylet. 



Fig. 328.— Dyna- 

 mene bene- 

 DICTI. Second 

 PLEOPOD OF 

 male (INNER 

 BRANCH). X 

 51?. 



51. Genus PARADYN AMENE, new genus. 



Second, third, and fourth articles of the palp of the maxillipeds not 

 produced into lobes. First article of the peduncle of the tirst antennje 

 with a long process at the upper end, which is acutely produced, and 

 extends to the extremit}" of the second article. 



Characters otherwise as in the genus Dynariume. 



Both sexes are known, the male and female being similar, but the 

 male is larger. 



PARADYNAMENE BENJAMENSIS, new species. 



Body oblong-ovate, twice as long as wide, 5 nun.: lU mm. 



Head wider than long, 2 mm. :3 mm., with the anterior margin 

 widely rounded and produced over the basal articles of the antennae, 

 so as to entirely conceal them. The eyes are small, round, composite, 

 and situated in the post-lateral angles. The first pair of antennsK have 

 the first' or basal article large and elongated, with a long acutely ter- 

 28589—05 20 



