ON SPLANCHNOTROPHUS. 55 
SPLANCHNOTROPHUS BREVIPES,n.sp. (Pl. XVI. figs. 1-6.) 
Cephalothorax femine brevis, robustus. Appendices thoracicz crasse, corporis longitu- 
dine breviores. Pedes uniramei, inartieulati; ungues fortes. Annulus genitalis 
transversim oblongus, postice incisus. Appendices caudales setis tribus non plu- 
mosis instructe. 
Mas ignotus. 
Longitudo 4!; unc. ; lat. $ une. 
Doto coronata atque Eolis rufibranchialis huic speciei visceribus victum prebent. 
The first segment of the cephalothorax in the female is thick, a little depressed, and not 
much longer than broad. "That portion of it which belongs to the head projects slightly 
in advance, and is rounded in front, while, behind, the segment suddenly tapers to its junc- 
tion with the second. On each side there are three stout, inarticulated, tapering pro- 
cesses, the bases of which meet each other at their junction with the thorax. These lateral 
processes are shorter than the length of the segment from which they originate. The 
radiating disposition of these curious arm-like appendages give to the animal a stellate 
appearance; and with them it clasps the viscera of the Nudibranch within which it has 
taken up its abode. 
The antennz and the whole of the apparatus of the mouth closely resemble the same 
organs as they have been described in S. gracilis. In neither species could the exact form 
of the extremely minute maxill:e be determined ; nor could it be satisfactorily ascertained 
whether the extremity of the first pair of foot-jaws was denticulated, though in this as well 
as in the first species, as viewed in certain aspects, it appeared to be so. 
The two pairs of thoracic feet (Pl. XVI. figs. 2 a & 5) are quite in a rudimentary con- 
dition, and reduced to mere hooks of no great size. The first pair are placed on the an- 
terior portion of the thorax, rather far apart from each other, with their points inclining 
inwards. The second pair are situated at some distance behind the first, and in a line 
with them. 
The second cephalothoracic segment (Pl. XVI. fig. 4 b) is minute, transversely oblong, 
and unprovided with appendages. Itis of the same width as the tapering extremity of the 
first segment, and the sides are gently rounded. : ; 
The first abdominal (Pl. XVI. fig. 4c) is slightly narrower than the preceding articula- 
tion. In form it is transversely oblong, with the posterior margin hollowed out centrally. 
The second abdominal segment (fig. 4 e) is very small, and subquadrilateral. It gives 
support to the tail, which is of the usual bifid form, each portion being apparently com- 
posed of two articulations, the last of which is much the smaller, and terminates in a short 
seta. There are also two minute sete at the external margin of each of the caudal 
processes. 
The ovigerous sacs (Pl. XVI. fig. 2 c) are oval, and nearly as long as the body of the 
animal. They issue from the posterior angles of the first abdominal segment. The eggs 
are rather large, and of a pale yellow colour. 
The male has not been observed. 
Three individuals of this grotesque form were obtained from as many specimens of 
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—)ra,. 
عت 
