

qqq CRUSTACEA. 



Near Tauria. Feet of seventh pair nearly rudimentary. Antennae 

 of first and second pairs remote at base. 



Cyllopus magellanicus. 



Caput subrotundatum, pigmentis fere repletum. Thorax elongatus, epi- 

 rneris quartis grandioribus. Antenna Imce summo f route capitis 

 insitce, crassiuscul.ee, acuminatce, infra ciliatce, duobus articulis apicali- 

 bus rninutis; 2dce imd parte capitis insitce, tenues, 7 -articulates. Pedes 

 quatuor antici, teretes (coxa exceptd) ; pedes Stii itique paulo crassiores, 

 bti Qtique longi, tenues, nudi, articulis quarto quintoque infra subtilis- 

 simd serrulatis; 7 mi rudimentarii. 



Head nearly round, and almost filled with the pigment. Thorax 

 elongate, epimerals of fourth pair largest. Superior antennas pro- 

 ceeding from upper part of head, and inferior from the lowest part ; 

 the former having the fourth joint long acuminate and ciliate 

 below, and following this, two minute joints ; the latter slender, 

 seven-jointed. Two anterior feet terete (coxa excepted) ; third and 

 fourth pairs a little stouter than four following; fifth and sixth long 

 and slender, and having the fourth and fifth joints very delicately 

 serrulate within ; seventh pair rudimentary. 



Plate 68, fig. 1 a, animal, enlarged; b, superior antenna; c, inferior 

 antenna; d, mandible; e, maxilliped; /, leg of sixth pair, with 

 branchia ; g, extremity of abdomen, with stylets. 



Orange Bay, Tierra del Fuego, on the Fucus. Collected, February 

 18, 1839. 



Length, four lines. Nearly colourless ; a little red in the abdominal 

 joints and abdominal legs; pigment of eyes, black in the mass, but 

 when pressed out, a deep reddish purple. The thorax has the 

 fourth and fifth segments longest. The lateral margins of the three 

 anterior abdominal segments serrulate, rounded; of fourth abdominal 

 segment pointed. The superior antennae are acuminate, and a little 

 shorter than the inferior. The inferior has the articulation between 



