XORTH ATLANTIC SEA AND THE FAROE CHANNEL. 115 



joint ; the oral parts are retrograded ; the first to fourth feet as in the 

 female, the fifth pair rather like Fseudcetideus armatus S . each of two 

 basal joints, and a two-jointed exopodite, right foot the largest, with 

 last segment a curved thin joint ending in recurved spiny process, last 

 joint of the left exopodite spatulate ; rudimentary endopodites on each 

 side, the left simple, long, thin, the right short and club-shaped. 

 (PI. IX, figs. 7 and 8.) 



6. FsfudaiAcleus armcdus* {nov. gen. et sp.). liesembling ^tideus in 

 many features. Strongly bifurcate rostrum in both sexes, last thoracic 

 segments united and produced into short spines. Cephalothorax three 

 times as long as the abdomen ; second basal of the posterior foot-jaw 

 three times as long as the endopodite ; endopodite of second feet two- 

 jointed; simple hairs on the margins of the basals of the fourth feet; 

 anterior antennai in the $ twenty-three-jointed (8-9, 24-25) ; mandi- 

 bles with exopodite twice as long as endopodite ; posterior antenna 

 with both rami nearly equal. 3 with rostrum ; anterior antennas 

 twenty-two-jointed; oral parts retrograded; a pair of fifth feet, the 

 right foot ending in a curved, spine-like process, the left foot shorter, 

 with broad-haired terminal segment ; rudimentary endopodite on each 

 side. Size, ? 3-68 mm. ; <? a little less. (PL IX., figs. 29, 30, and 31.) 



This Copepod is identical with Sars' Chiridius armatus -j- and Boeck's 

 Euchoita armata. It is, however, neither a CJiiridius nor a Eachmta, 

 and from its general resemblance to JEtidcus I have named the genus 

 Pseudcetideus and the species armatus. 



7. Eiichirclla carinata (Wolfenden). I have previously referred to 

 the 3 of this species found by me in the Faroe Channel (this Journal, 

 vol. vi., p. 36G, January, 1902). I have since found adult females in the 

 Atlantic, whicli confirm the correctness of the previous diagnosis. The 

 female is distinguished by the presence of a median cephalic crest and 

 helmet, a short, strong, one-pointed rostrum, in the proportions of the 

 posterior antennas (endopodite about half as long as the exopodite and 

 with 8-1-6 bristles on the second joint), and the absence of any spinula- 

 tion of the basals of the fourth feet. In size, 5 mm. (cephalothorax nearly 

 five times as long as the abdomen), this is one of the largest Euchirellas. 

 The bristles of the maxilla are, second basal = 5, endopodite =15. 



* Subsequently referred to. 



t The genus Chiridius, described by Sars {Crustacea of Norwaxj), contains only one true 

 Chiridius, viz. Ch. oltusifrons. His Ch. tenuispimis and Irevispinus are true Gaidius 

 (Giesbrecht), and his Ch. armatus a new genus Pseudcetideus, The modified bristles, large 

 and almost like tubal processes, of the fourth pair of feet, so characteristic of the genus 

 Gaidius, are found in the G. major and inmgens {Ch. brcvispinus and temdspinus, Sars) 

 in all my examples and in those kindly sent to me in April, 190'J, by Professor Sars, to 

 whom I then pointed out the nature of his species. 



