SCYLLARUS SCULPTUS, LATR. — WHITELEGGE. 
157 
many more were secured by wading and pulling up the seaweeds 
from deep holes. The plants were carried up above high water- 
mark, and left for an hour or so to dry. The drying has the effect 
of loosening the hold of the Isopods, and they may be readily 
detached by shaking the plants. 
The following is a complete description of S. sculptus : — 
Scyllarus SCULPTUS, Latreille. 
Scyllarus sculptus, Latr., Encyclopedic Methodique, pt. 21, 1818, 
pi. cccxx., fig. 2, and x., 1825, p. 416; Milne Edwards, 
Hist. Nat. Crust., ii., 1837, p. 283. 
Adult male . — Carapace 90 mm. in length, the width of the front 
between the orbits 49 mm., that of the entire frontal margin (spines 
included) 81 mm., and that of the hinder margin 77 mm. ; the 
greatest width is in a transverse line with the posterior cardiac 
region. 
The rostriform process is slightly depressed, somewhat emarginate 
anteriorly, with obtuse lateral angles ; its length is about 5 mm., 
its breadth anteriorly 6*5 mm., and its narrowest part is just 
above the base and measures 4 mm. It is bounded externally on 
each side by a transversely elongate C-shaped depression, into 
which the somital lobes are dove-tailed and appear to be fused 
with the carapace. Each lobe has about eight or nine rounded 
tubercles on the posterior border, a pair on the anterior externally, 
and a prominent wide based denticle about the middle ; its sides 
slope away to the rostrum and to the external pair of tubercles. 
The length of the lobe is 5 mm., and its width 10 mm. 
Lateral frontal margins deflexed, slightly curved, the inner 
extremity ending in a low tooth, the base of which is situated 
under the external portion of the somital lobe ; the outer portion 
of the margin curves upwards and terminates at the rather pro- 
minent interno-orbital spine. The orbits are well defined ; the 
cavity beneath the cornea is margined with long hairs. . The 
inner portion of the superior border is elevated and bears three 
prominent spines and as many low tubercles ; centrally there is a 
pair of tubercles bounded on each side by a sinus, and the outer 
portion has a series of four tubercles and a spine at the angle. 
Anterior to the latter is a wide sinus, and a large spine-like process 
which arises from a point near the insertion of the second antenna 
and forms the outer boundary of a large anterior orbital fissure ; 
the inner side is limited by descending process of the front. The 
base of the fissure is occupied by a lobe a little higher than broad 
at the base, and uni- or bituberculate at the summit. 
The upper surface of the carapace bears a few more or less 
acute spines, and is closely covered with flattened scale-like 
tubercles ; each tubercle is fringed anteriorly with short stiff setae, 
