158 COPEPODA. 



The first pair of thoracic feet are moderately slender 

 and the outer branches are three-jointed (PI. XVI. 

 % 5). 



The second, third, and fourth pairs are somewhat similar to 

 those of L. serrata with the exception of the inner branch of 

 the third pair in the male. In the male of L. serrata the 

 second joint of the inner branch of the third pair is produced 

 exteriorly into a moderately straight and elongated narrow 

 appendage with a slightly barbed extremity, and a single 

 seta springs from the inner margin of both the first and 

 second joints. In the male of L. inornata, on the other hand, 

 the appendage of the second joint of the inner branch is 

 slender and sigmoid and terminates in a pointed apex, and 

 both the first and second joints appear to be devoid of setae 

 on the inner margin. The third joint is nearly alike in both 

 species (PL XIV. fig. 7). 



The fifth pair in the female have the secondary joint 

 cylindrical, about twice as long as broad, and furnished with 

 five apical seta? ; the second seta from the inside is long and 

 stout, the others are smaller and of nearly equal length. 

 The inner produced portion of the basal joint bears five setae 

 arranged round the distal half of the inner margin and apex 

 as shown in the drawing (PL XVIII. fig. 4). 



In the male the fifth pair are considerably smaller than 

 those of the female, and resemble those of the male of 

 L. serrata ; the secondary joint, which is narrow and 

 cylindrical, appears to be provided \\ith onlv four apical and 

 subapical setse (PL XVIII. fig. 3). 



There is no spine on the posterior dorsal aspect of the last 

 abdominal segment in either the female or male. 

 The furcal joints are of moderate length. 

 Length of the specimens represented by the figures 

 female '75 mm., male '65 mm. 



The occurrence of L. inornata on the coasts of Devon and 

 Cornwall is of considerable interest, and greatly extends its 

 distribution. The species was described from female speci- 

 mens obtained in three gatherings collected in the Red Sea, 

 between the Gulf of Suez and a little to the south of latitude 

 20 N. The following are some of the places in the Devon 

 and Cornwall district where it has been taken : Salcombe, 

 and near Chequer Buoy Plymouth, Devonshire; and at 

 Fowev, Cornwall, among Corallina. 



