630 Mr. R. Gurney on Scapholeberis aurita. 
UC. & V., without good reason, since G. flavus is described as 
having “la bouche fendue jusque sous l’arriére de J’ceil,” 
whereas in G’. latus the cleft of the mouth barely extends 
to below the middle of the eye. Moreover, it appears to me 
to be unjustifiable to place G. banana, C. & V., in the 
synonymy of G. tatasica, Lichtenstein. ‘The description of 
this latter species is entirely inadequate, but as it is said to 
come from Brazil it is more probably identical with G. latus 
than with G. banana, which has been recorded from the 
Antilles and from Central America. 
Chasmodes maculipinna. 
Depth of body 4 times in the total length, length of head 
3} times. Snout concave, equal in length to the eye, the 
diameter of which is 4} times in the length of head. Inter- 
orbital space narrow, concave. Maxillary extending to below 
posterior $ of eye. D. XII 14, a notch between spinous and 
soft-rayed portions, the latter the higher, its longest rays 
equal to the postorbital part of head. A.18. Pectoral equal 
to 2 the length of head. Anterior part of dorsal with a large 
black spot, extending from the first to the fourth spine. 
Total length 63 mm. 
A single specimen from the Rio Durango, N.W. Hcuador. 
LXV.—Notes on Scapholeberis aurita (S. Fischer), a Clado- 
ceran new to Britain. By Ropert Gurney, B.A., Sutton 
Broad Laboratory. 
THE only species of the genus Scapholeberis hitherto recorded 
as British is S. mucronata (O. F. Miiller), but I have now to 
add S. aurita, which I have recently found in three localities 
in Norfolk. Considering the peculiar swimming habits of 
S. mucronata, as described by Mr. Scourfield *, it may be of 
interest to compare the two species in this respect, and also 
with regard to certain points in their structure. 
In both species the ventral margin of the shell-valves is 
flattened, but this area is proportionally larger in S. aurita 
and is bounded externally by a very prominent ridge and 
internally by the thickened edge of the valve. This thickening 
of the edge, which is quite conspicuous, is not continued thie 
* Journ. Linn. Soc., Zool. vol. xxy, pp. 1-19 (1894). 
