of the North-east Coast of England, 7 



of the inner branch much produced ; margins densely and finely 

 ciliated ; lateral spines of the outer branch lanceolate, laminar; 

 the basal joint fringed with a row of somewhat similar, but 

 much smaller, spines in pectinate series. Feet of fifth pair 

 consisting of a single slightly curved, club-shaped joint, 

 having on its outer margin one long spiniform seta with two 

 minute ones near its base, at the truncate extremity two 

 similar large set« with an intermediate smaller one, on the 

 middle of the inner margin six subequal curved setse of mo- 

 derate size, and at the extreme angle three of a similar kind 

 but smaller. Abdomen elongated, swollen at the base ; caudal 

 segments rather more than twice as long as broad ; tail-set£e 

 shorter than the abdomen. Length -^ of an inch. 



One specimen, dredged on a sandy bottom at a depth of 

 4 fathoms, off Seaton Carew, September 1871. 



The mouth-organs of this animal are of very remarkable 

 structure ; but I defer attempting any description or giving 

 any drawing of this species, in the hope of being able to illus- 

 trate it completely from a better series of specimens. 



Genus PSEUDOCYCLOPS, nov. gen. 



In general conformation resembling Cyclops. Right supe- 

 rior antennae of male without a hinge-joint, but much swollen in 

 the middle. Inferior antennse two-branched, secondary branch 

 nearly equal in size to the primary. Lower foot-jaw like that 

 of Cyclops. Swimming-feet having both branches three- 

 jointed. Fifth pair of feet in the male very complex in sti'uc- 

 ture, the external branch of one side produced into a powerful 

 sickle-shaped clasping-joint, the whole resembling very closely 

 the male copulative organs of some Ostracoda. 



Pseudocyclops crassiremis, n. sp. PI. 11. figs. 1-8. 



Left superior antenna of male seventeen-jointed ; basal joint 

 large and stout, those next following very short and broad, 

 gradually decreasing in breadth to the fifteenth, which is about 

 as long as broad ; last two joints more slender, about twice as 

 long as broad ; the whole limb densely beset on the outer 

 margin, especially towards the base, with long setee ; antenna 

 of right side ten -jointed, the central joints much enlarged, last 

 two suddenly contracted and similar to those of the left side, 

 antepenultimate joint armed with a strong lateral subfalciform 

 process ; both branches of inferior antennas bearing numerous 

 long, curved terminal setge ; first joint of the lower branch en- 

 larged and truncate at the distal end. Maxilla composed of 

 four digitate lobes, each bearing four long terminal setae. 



