572 PROF. c. H. o'donoghue ; report os 
a soft tiiaugular base, which bears at its antero-median corner a small stiff 
blade with three denticles. The maxillse are very small triangular lobes 
partly hidden by the mandibles. Each bears a spine-like prolongation at 
its antero-median corner. The first maxillipedes are somewhat triangular in 
shape, not unlike the mandibles, save that in place of the blades they bear 
spine-like processes. The second maxillipedes are long thin structures, 
expanded dorso-ventrally in their anterior region, and bearing spine-like 
prolongations at the anterior end. They are approximated in the mid- ventral 
line over the front part of their length, but diverge posteriorly. Altogether 
the mouth-parts show a considerable resemblance to those of S. yracilis, but 
their proportions are different, and they appear to be a little more degenerate. 
On the ventral side of the cephalothorax there are a pair of rounded 
papilliform processes opposite the bases of the first lateral appendages, and 
another and quite similar pair opposite the ends o£ the hist pair of lateral 
outgrowths. These are in the same relative position as the tiny legs in 
S. gracilis, as shown in the drawing of Hancock and Norman, but, while each 
bears a small spine, they are not nearly so much like thoracic appendages as 
those of S. gracilis. 
If we adopt the interpretation given by Hancock and Norinan (47, p. 52), 
two regions can be distinguished in the abdomen : the first an inverted 
cone joining on to the posteiior end of the cephalothorax and the second 
another inverted cone with a rounded edge at the base borne on the pre- 
ceding part. This second cone has a firmer chitinous covering than the 
cephalothorax and bears four annular grooves ; thus it is divided up into five 
rings, but whether these repi-esent actual abdominal segments or not it is 
hardly possible to say. Hancock and Norman group the anterior cone-shaped 
portion together with the basal ring of the second cone as the first complete 
abdominal segment, although in the present species there is a distinct, 
annular, articular groove separating them. The basal ring of the second 
cone-shaped portion has two lateral projections upon which the egg-sacs are 
borne. On the terminal portion of the abdomen are two small cylindrical 
projections each terminating in a short spine. 
The egg-sacs are elongated, cylindrical, soft-walled sacs with rounded ends. 
The sacs measured, in one individual, 6'2 mm. long by I'i mm. wide. The 
eggs within them are apparently just crowded together without definite 
arrangement, as is characteristic of the family Chondracanthidse, and do not 
exhibit the linear arrangement that is found in the Caligidse. 
Notes. Two specimens of this species were found upon one individual of 
C. hrevicaudatuni, both female and about the same size. The one of these 
measured 8'5 mm. long by 4'1 mm. broad; its egg-sacs, as noted above, were 
6"2 mm. long by 1"2 mm. wide and the length of the longest lateral process 
was 14'75 mm. One specimen was partially embedded in an actual hole in 
the body-wall of the Nudibranch about 5 mm. behind the urinar}- aperture. 
