124 NOTES ON THE COPEPODA OF THE 



my sailing master, to whose constant labour in the management of 

 instruments I owe a great deal. 



In addition to the before described new species the following are 

 new : — 



27. Hcterorhahdus longicornis (Giesb.) S . This was described by me 

 in this Journal (vol. vi., 1902) under the name of H. zetesios. Since that 

 time I have taken many specimens in the Faroe Channel and the 

 Atlantic, and have come to the conclusion that it is the 3' of H. longi- 

 cornis, the $ of which is of common occurrence in the north Atlantic, 

 and occurs not infrequently in the Faroe Channel. The anterior 

 antennse are longer than the whole body by four joints, the left a 

 clasping organ of six segments beyond the geniculation ; the left furcal 

 segment is much longer and broader than the right. The anterior foot- 

 jaw has one thick hooked bristle on the fifth lobe, but no toothcomb 

 bristles, and the fifth feet have on the right side an upright and stiff 

 process of the second basal armed with stiff bristles on the inner 

 margin, and the proximal inner margin of the first joint of the exopo- 

 dite with a protuberance armed with four teeth, and a second smaller 

 protuberance above with a bunch of short hairs. The second basal 

 joint of the foot of the opposite side is armed with short, stiff bristles, 

 the end joint of the exopodite produced into a long curved spine with 

 a shorter marginal spine on the inner side. (PI. IX., fig. 34.) The 

 mandibles with three teeth on the left side, four teeth on the right 

 masticatory plate. 



In the report by I. C. Thompson upon the " Oceana " Copepoda * is 

 figured on Plate VI. a pair of fifth feet of Mctridia venusta, which are 

 unlike any known Metridia feet, and resemble those of Hdcrorhahdus 

 longicornis ^. The general appearance of the whole animal and the 

 description in the letterpress probably refer to a Hcterorhahdus, which 

 the writer had wrongly thought to be a Metridict. 



28, Phyllopus hidentatus (Brady). The female of this species is of not 

 uncommon occurrence in the Atlantic west of Ireland. It has been 

 fully described by Giesbrecht. Put much uncertainty has existed 

 about the ^ . Prady's example was undoubtedly a male. The <? is 

 2'25 mm. in length, and closely resembles the ? except in the struc- 

 ture of the anterior antennaj and fifth pair of feet. The margins of 

 tlie last thoracic segment are not in any specimens produced like the 

 figures of Brady {C/icdl. Rep., " Copepoda "). The abdomen is of five 

 segments, which, with the furcal segments, are of about equal length. 

 The left anterior antenna is of twenty joints, and between the seven- 

 teenth and eighteenth is a geniculating joint, ^sthetasks are numerous, 



* Ann. and May. Nat. Hist., vol. xii. I'l. VI. 



