THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY, 



[SECOND SERIES.] 

 No. 120. DECEMBER 1857. 



XXXIX. — Description of eight new species of Entomostraca found 

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



[With two Plates.] 



During a short visit to Weymouth this autumn, I endeavoured 

 to rediscover Calanus (or Temora) Finmarchicu^, 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 Euchcefa. 



Frons obtusa. Cephalothorax 5-articulatus, postice obtusus, superne 

 visus sinuatus. Antenna) antiese cephalothoracis longitudine ; setia 

 apicalibus, et subapicali postera, sequis, subapicalibus anteris bre- 

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

 viore, 1 -articulate. Pedes primi, rame une 3-articulato, altero 

 2-articulato, articulo prime elongate. Pedes pesteri, parvi, uno 

 tantum rame, setis plumesis non instructi. Styli caudales breves, 

 setis mediecribus. 



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

 The cephalothorax is of the ordinary form, and much resembles 

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

 respect more nearly resembling C simplicicaudus. The first 

 segment of the cephalothorax occupies about fths of its whole 

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

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

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



Ann. ^ Mag, N, Hist. Ser. 2. Volxx, 26 



