30 



Mr. W. T. Caiman on 



lobe of antennules broad and rounded. Posterior lobe of 

 scaphognathite acutely pointed (PI. II. fig. l,c). Second 

 pair of peraeopods unequal, the carpus of the longer multi- 

 articulate. Branchial formula : — 



Type species Pandalus Montagui, Leach. 



Pandalus Montagui, Leach. (Pis. I.-IV. fig. I.) 



Pandalus Montagui, Leach, Edinburgh Encyclopaedia, vii. p. 482 



(1814). 

 Pandalus annulicorms, Leacb, Malacostraca Podopbth. Britanniae, pi. xl. 



(1815) ; Kriiyer, Voyages en Scandinavie, Crustacea, Atlas, pi. vi. 



fig. 3, a-c (1846) ; Bell, Hi.st. Brit. Stalk-eyed Crustacea, p. 297 



(1853). 

 Pandalus Montagui, White, Cat. Brit. Crust. Brit. Mus. p. 41 (1850). 



Description. — The length of the rostrum (PI. I. fig. 1, a) 

 referred to that of the carapace as unity varies in our specimens 

 from 1*2 to 1'5*. It is curved strongly upwards, rather 

 deep, and bifid at the tip. The number of spines on its 

 upper edge, including those on the dorsal crest of the carapace, 

 is ten or eleven (in one specimen twelve) ; of these four are 

 placed on the carapace behind the orbital notch, or in some 

 cases the fifth spine is just over the posterior margin of the 

 notch. In only one case out of about twenty examined were 

 there only three spines behind the orbit. Below, the edge of 

 the rostrum is cut into 5 or 6 strong teeth. 



The flagella of the antennules are approximately equal in 

 length to the carapace and reach to the tip of the rostrum or 

 only a little way beyond. The basal lobe is fringed with 

 setse on its anterior edge. 



The antennal scale (PI. II. fig. 1, b) has its outer edge 

 straight or slightly convex, terminating in a spine which 

 projects beyond the rounded tip of the scale. The width at 

 the tip is more than one third of the greatest width at about 

 one quarter the length from the base. It is to be noted that 



* The length of the carapace is taken from tbe posterior edge in tbe 

 mid-dorsal line to the back of the orbital notch, while the rostrum is 

 measured forward from tbe last-named point. 



