152 Rev. Canon A. M. Norman on British Mysidas. 



Hah. Firth of Clyde {D. Robertson) ; St. Andrews (Mcin- 

 tosh); Tarbert, Loch Fyne {Scottish Fishery Board), St&vcross, 

 Bey on {C. Parker) ; devsey {Sinel) : Mus. Nor. Plymouth! 

 {Spence Bate) ; Castleton, Isle of Man ! [G. S. Brady); Tox- 

 qusij {Griffiths) ; Weymouth {W. Thompson) ; Firth of Forth 

 {T.Scott). 



Distribution. Trieste {Vienna Museum) : Mus. Nor. Go- 

 letta {G. 0. Sars). 



6. Cynthilia frontalis (Milne-Edwards). 



1837. Mi/sis frontalis, Milne-Edwards, Hist. Nat. d. Crust, vol. ii. 



p. 459. 

 1845. Mysis frontalis, Lucas, Anim. artic. d'Algerie, Orustac^s, p. 49, 



pi. iv. fig. 7. 

 ? 1853. Mysis producta, Gosse, Auu. & Mag. Nat. Hist. ser. 2, vol. xii. 



p. 156, pi. vi. fig. 5 a, b. 

 1863. Mysis frontalis, Heller, Crust, d. siidliclien Europa, p. .303. 

 1876. Siriella frontalis, Gr. O. Sars, Middel. Mysider, p. 91, pis. xxiv., 



XXV. 



1882. Siriella {Rhinomysis) producta, Sarsi, and frontalis, Czerniavsky, 



/. c. fasc. i. pp. 98, 99, fasc. iii. pp. 36, 37. 

 1884. Pseudosiriella frontalis, Claus, " Keunt. d. Kreislaufsorgane der 



ScMzopoden u. Decapodeu," Arbeiteu Zoolog. lust. Wien, vol. v. 



Heft iii. p. 6. 



The M. producta of Gosse and the M. Griffithsice, Bell, may 

 be referable either to this species or the last. 



Rostrum of great size, forming a large subtriaugular and 

 acutely pointed plate, much longer than the eyes and reaching 

 beyond the middle of the long peduncle of the antennules. 

 Eyes narrow, cylindrical. Antennules with very long- 

 peduncle, basal joint longer than the two following combined^ 

 last with four setse on the inner margin; inner filament 

 unusually thick. Antennal scale rather shorter than peduncle 

 of antennules, subrhomboidal^ widening distally, extremity 

 very obliquely truncate and reaching far beyond the spine of 

 the outer margin. Legs more stoutly built than in P. armata. 

 Telson lanceolate, very long, subequal to two preceding seg- 

 ments in length ; marginal spines very numerous and towards 

 the extremity very unequal in length ; series of eight to 

 seventeen much smaller and equal-sized spines alternating 

 with very much larger spines, the narrowly rounded apex 

 with two of the large spines at the corners and three or four 

 small spines between them. Inner uropods rather shorter 

 than telson ; inner margin with numerous spines, larger 

 towards extremity, somewhat unequal in length towards the 

 base. Outer uropod with about thirty spines on the outer 

 margin, the second joint about one third longer than broad. 



