322 BR. H. J. HAXSEX ON THE [Nov. 29, 



kindly drawn for ine from the type specimen in the British 

 Museum (Natural History) by Dr. W. T. Caiman. 



Head. — Tlie lateral part is exceedingly expanded and anteriorly 

 produced into a very large, broad and long, triangular, acute 

 process, reaching forward nearly as far as the front margin of 

 second joint of the antennas ; the front margin outside the base of 

 each antennula produced into a rathei- broad, moderately long, 

 triangular acute process. Eyes long, very narrow, feebly curved, 

 oblique but essentially transverse, with their posterior end rather 

 far from the lateral margin of the head. 



Antennulfe have the second joint of the peduncle rather slender 

 -and somewhat shorter than the third ; flagellum very much longer 

 than the peduncle, consisting of numerous joints. 



Antennae have the basal joint, seen from above, rather small, 

 somewhat obliqvie, without an}^ real process, but at the outer 

 distal angle Avith a conspicuous sharp tooth, well-marked off from 

 the oblique froxit margin by an indentation, and far from reaching 

 to the distal angle of second joint. 



First thoracic legs elongate, slender, but widening distally, with 

 a large hand. Third joint long, with the distal part of the upper 

 side considerably expanded and produced into a rather long, 

 ■oblong-triangular process directed essentially forward ; fourth and 

 fifth joints each considerably shorter than the third, but the distal 

 half of the upper side is more expanded and produced into an 

 oblong-triangular acute process, which is long on the foui-th, very 

 long on the fifth joint. The hand is (according to Beddaixl's fig. 4) 

 large and very deep, not fully ^ as long as deep ; upper margin is 

 strongly convex and furnished with very long hairs on its distal 

 half ; lower margin is straight, with long hairs ; the angle between 

 lower mai'gin and palmai- edge measures about 100°, but is some- 

 what rounded ; palmar edge a little shorter than the lower margin, 

 straight, with a " i-ow of serrate spines, below which a few fine 

 slender laairs," and at its lower end a stout but moderately short 

 spine. The " claw " of normal size and shape, with serrate spines 

 along its lower edge. 



Abdominal shield nearly as long as broad ; according to sketches 

 and notes by Dr. Caiman, the lateral margin, though "a good 

 deal chipped and broken," "is very finely serrated, at least in 

 places," and terminates behind in a small tooth at the usual 

 notch ; posterior margin shaped almost as in *S'. serratum. 



Uropoda, according to Beddard's figure, more than half as long- 

 as the abdominal shield ; rami, according to his text, " subequal 

 in size." 



Distal joint of the endopod of second male pleopoda slender and 

 not expanded at or beyond the middle, terminating in a small 

 brush. 



Length of the single male specimen 16 mm. 

 Occurrence. ' Challenger ' " Station 320, oft* the Rio de la 

 Plata, February 14, 1876 ; lat. 37° 17' S., long. 53° 52' W. ; 600 

 fathoms." 



