SlMORHYNCHOTUS ANTENNARIUS. 49 



l. Simorliynchotus antennarius, C. GLAUS, 1861. 



Diagn. The head, with the rostral prolongation, is about as long as 

 the five first personal 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 antennae 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 of perwopoda is much 

 longer than all the following joints together. The femur of 

 the seventh pair is scarcely 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. Simorhynchns antennarius, C. GLAUS. 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 GLAUS 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 person, but does riot form a 

 distinct neck behind. Seen from below the under side of the rostral 1 ) 

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

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



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

 is more than half as long as the sixth. 



The metacarpus of the first pair of perceopoda 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 antennae and the 

 apex of the head. 



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



