A REMARKABLE NEW CIRRIPEDE. 949 
transverse rulges, which, where crossed by the longitudinal ridges, 
are broken up into bead-like prominences. The fixed and the 
movable tergum have this bead-like ornament only on the apico- 
basal ridge, the longitudinal ridges being absent on the remainder 
of the valve. On the movable scutum the longitudinal ridges are 
prominent only near the occludent margin. 
Rostrum widely semiconical, wider than the carina, bowed in- 
wards, its apex not freely projecting, and the lateral portion 
slightly more produced on the rostro-lateral side, on which the 
transverse arrangement of the ornament is pronounced. 
Carina subtriangular, bowed outwards, moderately convex 
ti ‘ansversely, the apex freely projecting ; a short distance from 
the carino-lateral margin and extending from the apex, is a 
prominent longitudinal ridge formed by the valve being folded 
along this line. 
Fixed scutwm (Pl. I. figs. 1a, 6) subtriangular, apex acuminate, 
considerably convex transversely, with a wide submedian fold or 
vidge extending from the apex; on the occludent side of the 
ridge the erowth- lines are upturned, and on the tergal side almost 
straight ; “oceludent and basal margins convex; tergal margin 
concave. On the inner surface a comparatively wide portion of 
the valve near the occludent and tergal margins is marked with 
growth-lines which meet on a raised ridge below the apex ; this 
ridge serves for the reception of the scutal angle of the tergum. 
The pit for the adductor muscle takes up a considerable portion 
of the lower half of the valve. 
Fixed tergum (Pl. I. figs. 4a, 6) subrhomboidal, considerably 
convex transversely, with a flat-topped apico-basal ridge which 
widens gradually downwards, and on this ridge the transverse 
ridges are broken up into small bead-like prominences owing to 
the crossing by the longitudinal ridges; basal margin acutely to 
broadly rounded. On the inner surface the apical portion is 
marked with growth-lines for about one-fourth the extent of 
the valve. 
Lateral valves—The two lateral valves seen in the complete 
specimen from Watford are somewhat broken, and as already 
stated, I am uncertain whether the three isolated valves are 
identical with them, or whether they belong to the species 
described (p. 952) as Scalpellum vimineum, sp.n. The two right 
valves, considered to be rostral-latera, are obliquely triangular in 
shape and considerably convex transversely. One (Pl. I. figs. 
9 a, 6) has the inner surface near the rostral margin marked with 
growth-lines to a greater extent than in the other valve (PI. I. 
fies. 8a, 6). The latter differs also in the direction of the 
transverse ridges on the outer surface, for along a line extending 
from the apex near to the rostral margin, the transverse ridges 
are not continuous but bend abruptly ‘but slightly upwards and 
then downwards to the margin. The right valve, regarded asa 
carinal-latus (PI. I. figs. 7 a, b), is subtriangular in shape and very 
gently convex transversely. On the inner surface the basal 
