SlMÜRHYNCHOTUS ANTKNNARIU«. 49 



1. Simorliyncliotus anteiiiiarius, C. Claus, 1861. 



Uia<i?i. The /lend^ with the rostral prolongation, is about as long as 

 the live lirst pereeonal segments together. The rostral part 

 is very broad, thick, and obtuse at the apex. » 



The lower anterior corner of the first flagellar joint of the 

 first pair of antennce in the male is produced into a process, 

 which is more than half as long as the breadth of the joint. 



The femur of the first and second pairs oï perœopoda is much 

 longer than all the following joints together. The femur of 

 the seventh pair is scarcelj^ more than half as long as that of 

 the sixth, and much narrower than the femur of the fifth pair. 



The peduncle of the first pair of uropoda is as long as the 

 inner ramus, and longer than the outer. 



The telson is as long as broad, with the apex sharp-pointed. 



Syn. 1861. Siinorliynchns aiitennarius, C. Claus. 23, p. 156. 



» » » 27, p. 188 (42). 



» » » 36, p. 65, pi. 17, fig. 9—19. 



All these three descriptions, just cited, are incomplete, and there- 

 fore the drawing given by Claus in 1887 was of much value for the 

 identification of the species. In addition to the characteristics given in 

 the diagnosis above the following may also be mentioned. 



The head rises a little above the peraeon, but does not form a 

 distinct neck behind. Seen from below the under side of the rostral') 

 portion is flat, and broader than a third part of the head. 



The lower hind corner of the first flagellar joint of the first pair 

 of antennœ is produced downwards to the middle of the third joint. The 

 second, third, and fourth flagellar joints are about equal in length. 



The sixth peneonal segment is longer than the fifth, the seventh 

 is more than half as long as the sixth. 



The metacarpus of the first pair of perœopoda is shorter than 

 the carpus; the dactylus is about half as long as the metacarpus. The 



1) By the rostrum or the rostral portion of the head is here always meant 

 the part situated between the point of fixation of the first pair of antennœ and the 

 ape.x of the head. 



Nova Acta Reg. Soc. Sc. Ups. Ser. IIL 7 



