59 



different species-, in the fourth specimen the 3 rd tergite is mutilated, like the rostrum. The 

 measurements in millimeters of the 5 th and 6 th somites and of the telson are in the three well 

 preserved specimens the following : 



Rostrum 1 ï f 



Length of s lh tergum ... 1,3 1,2 1 



Length of 6<h tergum ... 3,2 3,35 2,95 



Width of 6'!i tergum. . . . 0,96 0,95 0,84 



Length of telson 2,55 2,55 2,2 



In the first specimen the 6 th somite is 2,46-times as long as the 5" 1 and 3,33-times as 

 lono- as wide anteriorly; in the second these numbers are 2,8 and 3,5, in the third specimen 

 2,95 and 3,5. In these specimens the telson is a trifle shorter than the exopodite of the uropods, 

 reaching only by the large spines of the tip to its extremity, and in all the lateral margins are 

 armed with 4 pairs of spines besides those at the tip. These specimens therefore belong to the 

 parva paucidens stage, though the number of rostral teeth rises to eight. 



The male from Stat. 208, measuring 92 mm. from tip of rostrum to tip of telson, is 

 almost full-grown. The rostrum (Fig. 12), 17,5 mm. long, when measured in a straight line from 

 the base of the eyestalk to the apex, proves to be a little longer than the carapace (16 mm.) 

 and is obliquely turned upward, nearly as in the figure of this species in the "Recueil de Figures 

 de Crustacés nouveaux ou peu connus", but the upper margin is slightly concave and the upper 

 border of the carapace slightly convex, whereas in the quoted figure the upper border of the 

 carapace is slightly concave. The rostrum that projects by one-sixth of its length beyond the 

 antennal scales, is f-dentate and on both margins the teeth reach to near the tip. The three 

 posterior teeth of the upper margin, of which the i st stands just in front of the orbital margin, 

 are placed behind the i st tooth of the lower and the lower margin is not straight, but slightly 

 convex. The first tooth of the upper margin is the smallest of all, the 2 nd and the 3" 1 slightly 

 increase in size, while the following are almost as large as the 3 rd and paired with the teeth 

 of the lower margin. 



The spine on the 3 rd abdominal somite is the largest of all, while those of the three 

 following somites are nearly equal, the spine on the 4 th being but little smaller than that of 

 the 5 th ; the fine notch on the keel of the 4 th somite is situated on the posterior sixth. The 

 6 ,h somite, 10,5 mm. long, is [ l / 3 -times as long as the 5 th , that measures 6,75 mm.; the telson, 

 13,5 mm. long, twice as long as the 5" 1 somite and one-third longer than the 6 th , is just as 

 long as the outer uropod; besides a cluster of 6 or 7 irregularly placed spines at the end, 

 there are only two pairs of lateral spines, the anterior of which is placed just behind the middle 

 of the telson, the posterior a little nearer to the anterior pair than to the extremity. The legs 

 of the 3 rd pair are as long as the external maxillipeds, those of the 4 th and the 5 th decrease 

 successively in length. 



The largest of the three specimens from Stat. 230 is 34 or 35 mm. long and resembles 

 the specimen from Stat. 141. Carapace and rostrum, of which the former is 5 l L mm. long, 

 the latter 6 l / % mm., agree 'with those of the adult male from Stat. 208, the rostrum being 

 longer than the carapace, likewise obliquely turned upwards and reaching just as far beyond 



