Copepoda from the Falkland Islands. 373 



abdomen short, reflexed. The antennules are also short and 

 composed of seven joints ; the first three are large, the next 

 three small and subequal, while the end joint is nearly equal 

 in length to that of the two preceding ones combined (fig. 2). 

 The outer ramus of the antennae is only one-jointed, and 

 in this respect it differs from some other species which are 

 provided with a two-jointed outer ramus, but agrees with 

 Pseudothalestris tumida, G. S. Brady, from Kerguelen 

 Island *. The other mouth-appendages are also somewhat 

 similar to the species mentioned, especially the second 

 maxillipeds, the hand of which is similarly provided with a 

 small seta near the middle of the inner margin (fig. 9). 

 The first pair of legs has, as usual, the outer ramus very 

 short and composed of two distinct joints, the inner ramus is 

 elongated and composed of three joints, but the last two are 

 very small and subequal, and the terminal claw is elongated 

 and slender (fig. 8). The other natatory legs are normal. 



The fifth pair have the inner portion of the proximal joint 

 moderately expanded and furnished with five setae on the 

 irregularly rounded apex; the distal joint is small, sub- 

 quadriform, and bears five seta? arranged as in the drawing 

 (fig. 10). The caudal rami are very short. 



Male unknown. 



The length of the specimen represented by the drawing 

 (fig. 1) is '45 mm. (about ^ of an inch). 



Hab. Obtained in a small gathering collected by tow-net 

 in the vicinity of the Falkland Islands in Nov. 1909. Only 

 one specimen (a female) was observed. 



Remarks. The species described above resembles in some 

 respects the Pseudothalestris, G. S. Brady, from Kerguelen 

 Island, already referred to, in the structure of the outer 

 ramus of the posterior antennas and in the form and arma- 

 ture of the second maxillipeds ; but the body is not so 

 tumid, and there are one or two anatomical features in 

 which it also apparently differs. 



Fam. Diosaccidae. 



Genus Amphiascus, G. O. Sars, 1905. 



Amphiascus proximus, sp. n. (PI. XVI. figs. 1-7.) 



Female. — Species small : length *56 mm. (about J^ of an 

 inch). 



Antennules short, composed of eight joints ; the first four 



* ' Deutsche Siidpolar-Exped. 1901-1903/ Copepoda, p. 531, text- 

 figr. 22. 



