512 B. N. PEACH ON FURTHER RESEARCHES AMONG THE 
Acanthocaris attenuatus, nov. spec., Pl. XXVIII. figs. 1—-1e. 
Animal small, about 2°6 cm. in length, including telson. 
Carapace.—About 6 mm. in length, narrow in front, and broadening 
posteriorly to about 2 mm. Body 14 mm. long, narrow in front, where it 
measures ‘5 mm., gradually broadening backwards, its greatest breadth being 
1mm. The segments of which the body is composed as well as broadening 
increase in length backwards, the three last measuring respectively 1:5 mm., 
2mm.,and3mm. As in the already described species the ventral surface, of 
the third segment from tail appears gapped by a large notch, which in all 
probability represents the opening of the generative organs. Telson 6 mm. 
long by about 1°5 mm. broad at the base, and tapering to a point which is 
gently curved upwards, ornamented dorsally by a central ridge of small bosses, 
with a fluting on each side bearing a row of nearly circular raised rings with 
embossed centres. This ornament is much like that of Ceratiocaris elongatus, 
mihi, but is much larger in proportion to the size of telson than in that 
species. 
Order II. DEcAPODA. 
Genus Anthrapalemon, Salter, 1861. 
Anthrapalemon formosus, mihi, Pl. XX VIII. figs. 3-30. 
At the time of the reading of my last paper, this species was known by a 
single carapace only. Since then the Survey has added to its collection several 
specimens, which allow of the abdomen being studied. One of these shows a 
carapace like that described, which is displaced, doubled together, and turned 
round, so that its anterior end overlaps on to the first segment of the abdomen; 
but there can be no doubt that the different parts originally belonged to the 
same individual. 
None of the appendages of the cephalo-thorax have been observed. 
The abdomen, which varies in different specimens of from 1°8 to 3 cm. in 
length, consists as usual of six segments, and is in most respects very like that 
of A. Etheridgu, except that it is plainer and more elongated. The first 
segment is narrow, the second a little deeper, and the third much larger than 
either, while the sixth is the deepest. The last five are supplied with pointed 
pleuree directed backwards. The telson is of the same type as that of A. 
Etheridgui, but more elongated. It is about half the breadth of the sixth seg- 
ment at its anterior portion, tapers down to about one-third of its breadth, and 
then expands into an elongated spatulate membranous extremity, strength- 
ened by being slightly corrugated. At its narrowest part the telson has articu- 
lated with it two small accessory swimmerets, one on each side. The telson is 
oo Ye ee 
