ON THE SHETLAND CRUSTACEA, TUNICATA, ETC. 267 



antennae having basal joint very short, triangular, the second long, the 

 third two-thirds length of second ; flagellum long ; antennal scale about 

 one-third longer than the peduncle, widening from the base to the 

 spine of external margin, thence narrower by a very oblique truncation 

 to the apex ; the very large spine in the middle of the external margin ; 

 external margin below the spine naked, beyond the spine, apex, and 

 inner margin with long plumose setae, the second joint of scale having 

 one seta on each side and three terminal. Last joint of pefeiopods 7-arti- 

 culate. Sixth segment of pleon only slightly longer than fifth. Telson 

 subequal in length to inner lamellae, and longer than preceding seg- 

 ment ; lateral spines 25-30 ; cleft moderately deep, and wide toward 

 the extremity, the sides being only slightly convex, and the serration 

 longer and larger than usual distally. Inner uropods furnished with 

 long plumose seta3 all round, and a row of 16-19 rather long subequal 

 spines, separated from each other on the inner margin. Outer lamellae 

 narrow, and of nearly equal breadth throughout, nearly half as long 

 again as the inner. The male has the sexual lobe of the superior 

 antennae unusually long, as long as the whole peduncle. The antennal 

 scale is narrower than in the female, the spine nearer the apex than 

 the base, and the breadth not greater at that point than nearer the 

 base. The fourth foot of pleon is very long, and reaches beyond the 

 telson ; the outer branch very like that of M. spiritus, but the third 

 joint is much longer than either of the two first, which are subequal ; 

 fifth joint not more than half the length of the fourth. Animal more 

 or less tinted with yellowish or red. A specimen sent to me by Mr. 

 Edward of Banff was of a very delicate rose-colour. 



Taken 5-8 miles east of Balta, in 40-50 fathoms ; and also off Sea- 

 ham on the Durham coast (A. M. N.), Banff (Mr. Edward). 



Mysis vulgaris, J. Y. Thompson. In the stream which runs into Deal Yoe, 

 near Lerwick. 



Mysidopsis didelpJiys (Norman). Mysis didelpTiys, Tyneside Nat. Field Club, 

 vol. v. p. 270, pi. xii. figs. 9-11 ; Mysidopsis didelpJiys, Gr. 0. Sars, 

 Beretning (1863) Zoologisk Eeise i Christiania-stift. (1864) p. 27. Hare, 

 5-8 miles east of Balta, 40-50 fathoms. 



? hispida, n. sp. Body hispid all over, the hispidity evident even on the 



peduncles of the eyes. Eye-stalks of moderate length. Carapace pro- 

 duced into a broadly triangular rostrum of considerable length, reach- 

 ing beyond the middle of the first joint of the superior antennae; a 

 notch on each side of the front margin of carapace opposite the centre 

 of the insertion of the eye. Superior antennae with peduncle twice as 

 long as the eye-stalk; first joint long, slender, very concave above, two 

 following much thicker, the third double the length of the second, 

 hispid like the body. Inferior antennae with peduncle only reaching 

 the extremity of the penultimate joint of the superior ; scale pro- 

 duced, slenderly subulate, nearly twice as long as peduncle of superior 

 antennae (somewhat less in <$}, two-jointed, second joint one-third 

 total length, both margins fringed with long plumose setae, the second 

 joint having on each side four lateral at long intervals, and three 

 terminal. Last joints of pereiopods 4-articulate, first articulation as 

 long as the two following. Pleopods as in Mysis. Telson linguiform, 

 long and narrow, subequal to preceding segment ; sides margined with 

 30-35 spines, which are of equal length at first, but towards the 

 extremity much larger spines alternate at various distances (e. g. every 



TJ2 



