ox THE ZOOLOGICAL STATION AT NAFLKS. 2G5 



on the exopodite of the maxilla. It is further •without any trace of 

 rostrum, and is a small creature of only 1'8 mm. length. It appears 

 to be so generically distinct from the northern forms included by Sars 

 in this genus (one of which is undoubtedly a Gaidius) that it appears 

 more satisfactory to retain the generic name Chiridius for the one species 

 (Ch. poppei, Gbt. ) for which it was originally created, and to place the 

 northern forms, all of which are two or three times the size of the 

 Mediterranean species, in another genus. These various genera will group 

 themselves naturally in the following manner : — 



A. With a two-pointed rostrum. 



^Etideus, Brady, Pseuda'tideus (nov. gen.), Bradyidius, Gbt. 



B. With a one-pointed rostrum. 



Gaidius, Gbt., Gaetamis, Gbt., Chirundina, Gbt. 

 Undeuchreia, Gbt., Euchirella, Gbt. 



C. Without rostrum. 



Chiridius, Gbt., Bryaxis, Sars. 



Under this scheme the genus Chiridius (Sars) disappears and a new 

 genus, Pseudcetideus, is suggested, which includes Sars' species Chiriditis 

 arniatus, and another entirely new species discovered by the author in 

 the Faroe Channel. Sars' Chiridius tenuispinus is removed to its true 

 family Gaidius, and his Chiridius ohticsi/rons should more properly 

 perhaps be regarded as a Chiridius. There does not seem to be sufficient 

 reason to exchange the name Bradyidius (Gbt.) to Uudinopsis (Sars), and 

 the former is therefore retained. 



Vanhoffen (in Gronland Expedition, 1891-93, Berlin, 1897, Copepoden, 

 vi. Kapitel, p. 279) desci'ibed very briefly a Copepod captured in Green- 

 land, which he regarded as identical with Pseudocalanus armatus, Boeck, 

 but three times the size. Only one male was found in forty-five animals 

 taken. But the prolongation of the last thoracic segment into lateral 

 spines removes it from this genus. The author has met with one S 

 example of this Copepod in the Faroe Channel, but feels unable to place it 

 generically, in the absence of ? examples, which, according to the general 

 rule, may differ widely as regards the rostrum, proportions of the body, 

 and character of the mouth parts. 



Of the different genera and species cf the sub-family ^Efidiince the 

 following occur in the Faroe Channel or off" the coast of 'Sorway : — 



iEtideus tenuirostris . . a surface form. 



Pseudsetideus armatus . 



,, multiserrata 



Bradyidius armatus 

 „ similis . 



Gaidius pungens . 



,, boreale 

 Gaetanus armiger . 



,, miles 

 Euchirella rostrata 

 „ carinata 



Chiridius obtusifrons 



found only in deep water, below 

 100 fathoms. 



bottom forms, in shallow waters. 



deep-water forms, below 100 

 fathoms. 



ditto. 



ditto. 



a deep-water form from 200-800 

 fathoms (Sars). 



Bryaxis brevicornis . . <^ A"*,"""" /«°™x ^'°''' ^"^'^^^ 



I fathoms (Sars). 



