24 Scientific Proceedings, Royal Dublin Society. 
Rhopalorhynchus clavipes, sp. nov. 
Pl. 11., figs. 1-10. 
Proboscis nearly as long as rest of body. Club of proboscis 
not quite half as long again as its stalk, with a single minute tooth 
on its dorsal surface; femora of ambulatory legs greatly swollen 
distally in a club-shaped form. 
Length of the proboscis, 5 mm.; of the cephalic segment and 
trunk, 5°5 mm. ; of a palpus, 7 mm.; of a false leg, 7 mm.; of an 
ambulatory leg, 20 mm. 
A single female was taken by Professor Haddon. 
This very remarkable species is readily to be distinguished 
from &. tenwissimus (Hasw.), by the shape of the proboscis, which 
in the latter species is more angular and has a larger dorsal tooth. 
Also the relative length of the proboscis in our species is longer, 
that of R. tenwissimus being only four-fifths as long as the rest of 
the body. In the regular club-shape of the proboscis R. clavipes 
closely resembles &. Kroyeri, from which species it may, however, 
be distinguished by having only one tooth (not two) on the dorsal 
surface of that structure (fig. 3). Moreover, there is no trace of a 
suture behind the oculiferous tubercle, such as Wood-Mason 
describes for R. Kroyert. The cephalic segment is very short, with 
anterior processes where the palpi are inserted. The oculiferous 
tubercle resembles that of &. Kréyeri in form, being a cylinder 
with a short, pointed cone above; four large eyes without black 
pigment (fig. 8-4) are situated at the junction of the cylinder and 
the cone. The lateral processes of the cephalic segment are situ- 
ated at its hinder extremity. The first and second trunk segments 
are elongated, the first being slightly the longer; these segments 
are cylindrical, very attenuated for the greater part of their 
extent, spreading into a “flange” anteriorly where attached to 
the segment in front, and broader also posteriorly where the lateral 
processes arise ; these processes are cup-shaped. ‘he third trunk 
segment is short (shorter relatively than in R. MKréyeri), and its 
lateral processes point backwards. Below it and directed down- 
wards is the extremely small caudal segment (fig. 5), at the 
extremity of which the anus can be seen, in form a longitudinal 
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