28 
T. V. HODGSON. 
is rounded. The palp is three-jointed. The first is very small, the second large, cordate 
in shape; the third is a rather short and broad lobe, articulated nearer to the outer 
portion of the second. The inner margin of the second joint and the extremity of the 
first are richly clothed with simple setae. A few other small ones are scattered along 
the other margins, and also irregularly over the surface of the entire palp, masticatory 
lobe, and distal portion of the epignath. 
Eights’ description of this organ is not easy to interpret exactly, but as far as 
it goes it agrees with the above, except that a single tooth is only mentioned as 
occurring on the masticatory lobe. As the second may be easily concealed by the 
palp, this is of small moment. 
The descriptions given by Dr. Studer and Mr. Beddard are very concise. The 
figure given by the former is very crude and incomplete, though fairly correct as far 
as it goes. Mr. Beddard’s figure is very much more correct and detailed. Only one 
tooth is figured, the position of the second being covered by the palp. The basal 
plate is, however, figured as being divided. I have not been able to detect the 
existence of such a division even with a -jt objective ; bands of muscle interfere greatly 
and render its determination difficult. 
The first appendage of the mesosomeis subchelate and comprises six distinct joints, 
the first of which is subequal iu length to the last but one. The three following are all 
very short, and two, the more distal ones, have a very irregular shape. These three 
short joints all bear a tuft of somewhat specialised setm, which are numerous only on 
the third of the joints, and this one, with the second, bears a number of very minute 
teeth on its inner margin, the third having in addition two stout teeth and a third 
much smaller one. The propodus is large and ovate in shape, its inner margin being 
flattened to form a blunt knife edge and provided with a series of very highly 
specialised structures, which have not been described for this species, notwithstanding 
the fact that they afford valuable specific characters. Eights describes the margin of 
this joint as ciliate. Dr. Studer remarks that it is provided with lancet-like teeth, 
and figures five joints of this appendage, but on so small a scale as to be worthless. 
Mr. Beddard does not refer to this appendage except in very general terms. The 
specialised structures (figs. 7 and 8) consist of a regular series of stout teeth, and alter¬ 
nating with them are leaf-like blades, both being obviously of a sensory nature. The 
teeth have a strongly-marked “ midrib,” which, however, is not quite straight, and 
terminates in a delicate elongate sensory structure. The blade is very faintly 
striated, and terminates in an irregular manner, to allow the sense organ to protrude. 
The “ leaf-like ” organ also has a distinct “ midrib,” but the blade is very unequally 
developed on the two sides, and exhibits a much coarser striation than the tooth. 
The “ midrib ” terminates in precisely the same way and in a similar sensory structure. 
Of the remaining appendages of the mesosome four progressively increase in size, the 
second to the fifth ; this and the sixth are subequal in size, but the seventh is much 
smaller, but in the larger of the ‘ Discovery ’ specimens the greater part of most of these 
