cod 
SCUTELLIDIUM. I74 
cephalothoracic segment (fig. 1) in the female is ex- 
tremely small; the first abdominal segment is formed 
by the almost complete union of two segments, the 
point of junction being marked by a chitinous line 
on each side; the remaining abdominal segments, as 
well as those of the tail, are very short and broad. 
The inner tail-setz are considerably longer than the 
abdomen. Hye consisting of one central and two 
lateral lenses. Ovisac large, circular, and extending 
considerably beyond the extremity of the tail. Length 
sth of an inch (‘98 mm.). 
Excepting one imperfect specimen, which had four 
deep red bands across the body, I have not seen the 
male of this species, but Dr. Claus figures it, describ- 
ing the anterior antenne as being modified for clasping, 
and the fifth pair of feet diminished in size, asis usual. 
Dr. Claus asserts the secondary branch of the posterior 
antenna to be 4-jointed, but after repeated examina- 
tion, I have failed to satisfy myself of the exact state 
of the case. In some of my specimens the branch 
appeared, indeed, to be indistinctly (and perhaps 4-) 
jointed, but the articulations were so faint that I 
should have overlooked them altogether without care- 
ful search; and even yet I should hesitate to affirm 
that there is more than a single joint. 
S. tisboides seems to be of rare occurrence. I have 
taken one or two specimens at Roker, near Sunder- 
land, on fronds of Laminaria saccharina, a few on 
weeds in tide-pools at Clifden and Roundstone, and 
a rather larger number on weeds in Porcressa Bay, 
Scilly. 
VOL. It. M 
