Rev. Canon A. M. Norman on British Mysidae. 149 

 Subfani. I. Cynthiliin^. 



Genus 1. Cynthilia, J. E. Gray, 1850*. 



= Cynthia, J, V. Thompson (uon Fabr., nee Sav., nee Latr.). 

 =Siriella, Dana, 1852. 



Rostrum produced, pointed, sometimes of great size. An- 

 tennal scale more or less subrliomboidal, outer margin naked, 

 terminating in a spine. Legs having the tarsus only two- 

 jointed and terminating in a well-developed tvv^o-jointed acute 

 nail, encircled at the base with sets. Telson linguiform or 

 lanceolate, apex entire, sides furnished with spines of unequal 

 length. Outer uropods two-jointed, first joint spined (not 

 setose) on outer margin. Male with pleopods having multi- 

 articulate swimming-branches, the inner branch furnished 

 usually with a bifid process, which is usually on the middle 

 pairs curiously involutely coiled. 



This genus is at once distinguished from all others by the 

 character of the pergeopods and outer uropods. 



1. Cynthilia norvegica (G. 0. Sars). 



1869. Siriella norvcnjica, G. 0. Sars, Undersogelser over Christiania- 

 fjordeus Dj'bvandsfauna, p. 40. 



1870. Siriella norvegica, Ci. O. Sars, Carcinol. Bidrag til Norges Fauna, 

 1. Mouogr. Mysider, p. 24, pis. xvii., xviii. 



1886. Siriella norveyica, Norman, Fourth Annual Report Fishery Board 

 of Scotland, p. 101 ; Ann. & Mag. Nat. Hist. ser. 5, 188", vol. xix. 

 p. 06. 



i?oc?3/ very slender; cephalothorax hardly broader than pleon. 

 Rostrum acutely produced, reaching nearly the middle of first 

 joint of antennules. Eyes clavate, of moderate size. An- 

 tennules having tiie peduncle much elongated, equalling half 

 tiie length of the cephalothorax ; the first joint a little longer 

 than combined lengths of the two following ; third joint longer 

 than the second in female, with three plumose setge on the 

 inner margin and two or three more at the extremity. An- 

 tennal scale rhomboidal, scarcely equalling the length of 

 peduncle of antennules, two and a half times as long as broad, 

 very obliquely truncate at the apex, the extremity reaching 

 far beyond the spine of the outer margin. Legs rather slender ; 

 tarsus and preceding joint equal in length. Telson equal in 

 length to one third of the pleon, narrowly lanceolate, con- 

 stricted near the base, its termination with a strong spine at 

 each corner, and between these three small spines, of which 



* J. E. Gray, Cat. Brit. Anim. in Coll. Brit. Mus., Pt. iv. Orustaeca, 

 p. 46. 



