65 



tooth of the lower border, it ascends more strongly obliquely upward, reaching almost to 

 the extremity of the antennal scales, while in the type species the rostrum extends 

 distinctly bevond them. At the base of the rostrum are six subequal, contiguous teeth on the 

 sharp frontal crest, of which the 4"' is situated above the orbital margin, while the 6 th proves 

 to stand above the corneae of the eyestalks, when stretched forward; in front of these teeth 

 still four other similar teeth occur at larger, though equal distances from one another, of which 

 the i st reaches just beyond the spine of the lower margin, while the anterior tooth is twice as 

 far distant from the acute tip of the rostrum as from the apex of the penultimate tooth. The 

 large single tooth or spine of the lower border is straight and acute, implanted at the posterior 

 fifth of the margin, directed obliquely downward and forward and reaches just beyond i st 

 antennular article. 



Outer orbital angle hardly defined, post-antennular spine small, post-antennal spine very 

 salient, and, like in the type species, continued backwards, to the end of the hepatic groove, 

 as a sharp carina. 



The abdomen resembles that of the typical species. Tergum of i st somite rounded, with 

 no tracé at all of carination, 2 nd to 6 th somite sharply carinated, the 3 rd to the 6 th posteriorly 

 produced to a tooth; the tooth of the 3 rd somite is the largest, that of the 4 th is a little smaller, 

 while those of the 5 ,h and of the 6 th are the smallest of all and subequal. Like in other species 

 there is a fine notch at the posterior fourth of the 4 th tergum. Sixth somite about 1 Y 2 -times 

 as long as 5 th . Telson one-third longer than 6 th somite and projecting by the terminal spines 

 beyond the outer uropods, when stretched straight backward; its upper surface is faintly grooved, 

 except just behind the middle where it is flattened. One observes at the end of the telson 3 

 movable spinules at either side of the terminal spine, while the sides of the posterior half are 

 armed with 6 or 7 small, movable spinules. 



Looked at from above the corneae appear just as broad as the rest of the eyestalk, in 

 a lateral view they appear much thicker than it; they are chestnut-coloured, somewhat 

 darker on the outer side, but there is no tracé of an ocellus. The rather depressed 

 eyestalks bear a prominent and acute, ocular papilla at the distal end of the inner 

 border and this papilla is contiguous to the cornea and directed forward ; the outer border of 

 the eyestalk appears somewhat concave just behind the cornea, while the posterior half is 

 obtusely carinate. 



Antennulae a little more than half as long as the body, their peduncle reaching to the 

 middle of the antennal scales ; stylocerite with acute tip, almost as long as i st article. 



External antennae almost twice as long as the body. Lower side of 2 nd joint of antennal 

 peduncle obtusely carinated longitudinally in the middle and produced to a fine, slender' 

 acuminate spinule that is turned downward and a little outward ; flagellum 165 mm. long, twice 

 as long as the body without the rostrum; scaphocerite measuring four-fifths of the carapace, 

 the rostrum excluded. 



External maxillipeds reaching two-thirds of the way along the antennal scale. The legs 

 of the i st pair project by the fingers, those of the 2 nd by the fingers and half the palm beyond 

 the antennal peduncle-. the legs of the 3 rd pair, the longest of all, are but little shorter than 



SIBOGA-EXPEDITIE XXXIX a'. n 



