THE xVNNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SECOND SERIES.] 

 No. 120. DECEMBER 1S57. 



XXXIX. — Desa'iption of ei^ht new species of Entomostraca found 

 at IVeymouth, By John Lubbock, F.G.S. 



[With tu-o Plates.] 



During a shovt visit to Weymouth tiiis autumn, I eudeavourrd 

 to rediscover Calanus (or Teniora) Fiamarchicus, in order to clear 

 up certain doubtful points in its anatomy. 



Though unsuccessful in this search, I was amply repaid by 

 the discovery of eight new species of Entomostraca, three of 

 which belong to genera not previously caught in our seas, and 

 two are even the representatives of families not hitherto recorded 

 as British. 



Calanus EucJmta. 



Frons obtusa. Cepbalothorax 5-articulatus, postice obtusus, superue 

 visus sinuatus. Autenuaj anticae cephalotboracis longitudine ; setis 

 apicalibus, et subapicali postera, eequis, subapicalibus auteris bre- 

 vibus. Antennae secundae, ramo uno longo, altero plus duple bre- 

 viore, 1 -articulate. Pedes primi, ramo une 3-ariiculate, altero 

 2-articulate, articulo prime elongate. Pedes i)osteri, parvi, une 

 tautum ramo, setis plumosis nen instruct!. Styli caudales breves, 

 setis mediocribus. 



This species is colourless, except the eye, which is bright red. 

 The cepbalothorax is of the ordinary form, and much resembles 

 that of C. comptiis, except that it is rather more obtuse ; in this 

 respect more nearly resembling C. svnplicicauJus. The first 

 segment of the cepbalothorax occupies about |ths of its whole 

 length. The anteunpe, measured from end to end in the posi- 

 tion they usually occupy, are as long as the cepbalothorax, and 

 about eight of the setse are considerably longer than the rest, 



Atin. ^ Mag. N. Hist. Ser. 2. Vol. xx. 26 



