The British Oceanic Entomostraca. 25 



days of the investigation of any particular group, the minute 

 specific characters should be understood, or, indeed (in many 

 cases), that the really important characters should be recog- 

 nized as such. Under these circumstances it seems unfair 

 that the names proposed by the first describer should be 

 allowed to lapse, merely because their descriptions are not 

 found to be minute enough for the purposes of more modern 

 science. Where two or three forms, massed together by the 

 original discoverers under one specific designation, afterwards 

 prove distinct enough to require separation, any author describ- 

 ing them would do better to fix the original name upon one of 

 these forms, even though doubtful as to the first reference, 

 than to ignore the labours of a previous investigator by dis- 

 carding his nomenclature altogether. 



0. septentrionalis, as met with in our seas, agrees entirely 

 with the characters ascribed by Dr. Claus to his G. Helgolan- 

 dicus. I can, therefore, entertain no doubt that Goodsir's 

 specific name is properly referable to that form, and have here 

 retained it. on the ground of priority. The characters which 

 distinguish it from Dr. Clauses G. longiremis appear in the 

 arrangement of the long setae of the upper antennae (Fig. 3), 

 and in the presence of a row of serrations on the inner side 

 of the basal joints of the fifth pair of feet. It haunts, indiffe- 

 rently, both the open sea and tidal-pools, and is often to be 

 met with in countless numbers, appearing to be pretty generally 

 distributed in our seas. I have specimens of it from Shetland, 

 Northumberland, and Durham, and the Channel Islands. 



Calanus anglicus, Lubbock. Lubbock, Ann. and Mag. 

 Nat. Hist., 2nd series, vol. xx. 



Unknown to me, except from Mr. Lubbock's account of it. 



Calanus Clausii, Brady. 



A new species, described by me in a report presented to 

 the Tyneside Naturalists' Field Club, but not yet printed. The 

 fifth feet of the male are long and straight, slender, and com- 

 posed of simple cylindrical articulations, the last of which tapers 

 to a fine point. The first joint of the abdomen is, in the 

 female, very tumid anteriorly. I have found G. Glausii abun- 

 dantly in gatherings of entomostraca from Shetland, the Chan- 

 nel Islands, and the coast of Durham, where it abounds both 

 in tide-pools and in the open sea. 



Dias longiremis, Liljeborg. Liljeborg, Crust, ex. ord. 

 tribus, t. xxiv., figs. 1 — 13. 



This species is readily recognized by the knotted appear- 

 ance and peculiar arrangement of the setae on the upper 

 antennae, and by the characters of the fifth feet, which, with 

 their uncouth and gouty -looking conformation, are not easily 

 described except with the aid of figures, for which we have 



