182 " THETIS " SCIENTIFIC RESULTS. 



angle of a short prominence immediately in front of the well 

 mai'ked cervical groove ; the latter is bounded posteriorly by twa 

 subtriangular lamellse, which are separated mesially by a space 

 equal to their length ; each lamella has the anterior margin 

 depressed and follows the contour of the groove ; the posterior 

 margin is elevated, ridge-like, slightly sinuous, and terminates 

 externally in a prominent triangular denticle, bearing one or two 

 spinules and a few hairs. 



Ocular peduncles exceeding the rostral spine by about half 

 their length, short, stout, 1-5 mm. long and 0.75 mm. wide at the 

 base, slightly constricted below the rounded blackish-brown 

 cornea ; the upper surface of the peduncle bears some scattered 

 hairs and a few in tufts ; of the latter there are two at its 

 extremity and one seated on a small tubercle situated on the 

 inner aspect about the middle. 



Peduncle of first antenna 2-5 mm. long; the first joint short 

 and stout; second slender, more than twice as long as the first; 

 third joint dilated distally, with a few long stiff setse near the 

 summit. 



Smaller flagellum shorter than its supporting joint, consisting 

 of nine subequal articuli, with two or three long setse ; larger 

 flagellum strongly setose proximally ; the four terminal joints are 

 elongate, equal and glabrous, except the last, which has a few 

 short hairs at the tip. 



Peduncle of second antenna 2*3 mm. long, with a denticulated 

 ridge below its origin which extends upwards and inwards over 

 the bucal orifice. First joint with a short spinule on its outer 

 distal angle and a large, stout, setiferous lobe on the inner. 

 Antennal acicle subcylindrical, without spinules, but bearing a 

 few hairs in the middle and at the summit ; equal in length to 

 the first joint and to the inner lobe-like prolongation, reaching as 

 far as the extremity of the second joint ; the third joint is more 

 than twice as long as the acicle. Flagellum about as long as the 

 body, sparingly clothed with short hairs. 



External maxillipedes about 2*5 mm. long; ischium joint with 

 a row of eighteen equidistant denticles on its inner margin, and 

 a strong spine — projecting at a right angle — near the distal 

 extremity. Merus a little longer than the ischium, with an erect 

 spine at its externo-distal angle ; the two following joints are 

 subequal in length and slightly hairy ; seventh joint tapering, 

 blunt and densely setose. Second joint of the exopod narrow, 

 elongate, and almost reaching to the base of the sixth joint of 

 the endopod ; it is abruptly narrowed near the summit, and bears 

 a few long hairs on its inner margin, and three long curved 

 bristles on its outer border ; the terminal joint has a long marginal 

 fiinge. 



