THE PLANKTON OF THE FAUuE CHANNEL AND SHETLANDS. 367 



developed five-jointed endopodite ; in the anterior foot jaw the lobes 

 are large, compressed, and the endopodite articulates behind, as in 

 ^tidius. The hooked bristle on the fourth lobe is very strong and 

 longer than that in the fifth lobe. This organ greatly resembles E. 

 rostrata. The animal resembles no known ^ Euchirella {E. amcena, 

 E. messinensis, E. imlchra), but though comparatively large, it may 

 be an undeveloped ^ . It will be figured and described subsequently. 



Euchirella ? rostkata f? var.) ? . 



Size 3'8 mm. There is no crest, but a one-pointed rostrum. The 

 abdomen and genital segment are quite symmetrical. The anterior 

 antennae have twenty-three joints. The internal branch of the posterior 

 antennae is as 5 : 8, and the end of the endopodite carries 6 -H 5 bristles. 

 The fourth feet have peculiar spines on the inner margin of the first 

 basal joint, four in number, one of which is large (the proximal), 

 the others progressively smaller and further proximally from the 

 stout inner hair than in E. rostrata, which it most resembles. The 

 maxilla is very similar to E. rostrata, and the mandible is similarly 

 like, except that the inner tooth of the chewing end is much longer 

 and sharper. The absence of a crest and the symmetrical genital seg- 

 ment and spines of the basal joint of the fourth feet differentiate it 

 from E. 'pidckra $ . 



The larger size and number of bristles on the endopodite of the 

 posterior antennae and smaller number of spines (or triangular lamellse) 

 on the fourth basal differentiate it from E. rostrata, of which, however, 

 it may be a variety. It will be described and figured subsequently. 



Two perfect specimens were captured at 300 fathoms. 



HeTEROCH^TA ZETESIOS, n. S2). ^ 



Length 3'5 mm. This Copepod, found in Fowler's Eesearch Collection, 

 was in very good state of preservation, except that the end segments 

 of the anterior antennae and tail setae were damaged. The portion 

 of the anterior antennae left (nineteen joints) reached a length 

 of 4 mm., so that it was much longer than the whole length of 

 the animal. The geniculatiou occurs between the eighteenth and 

 nineteenth joints. The basal joint of the posterior foot jaw has 

 bristles, but no long spine, and the last two lobes of the anterior 

 foot jaw carry plain hooks not beset with comb teeth. The fifth 

 lobe is very much longer than any of the others, and its hooked 

 bristle is stouter than that of lobe 4, and is quite without teeth or 

 hairs, while that of lobe 4 is beset with fine short bristles. The 

 mandibles, unlike H. loufjicornis {oi which it might possibly be the «?, but 



