494 On some rare Crustacea. 
but, so far as we know, this is the first time Lathonura recti- 
rostris has been observed ina Scottish loch. ‘This Cladoceran 
appears to be very fragile, for though a number of specimens 
have been obtained, all are more or less damaged. “The 
peculiar plates attached to the ventral margin of Lathonura 
rectirostris, instead of the usual sete or spines, at once serve 
to distinguish this species from all other Kntomostraca with 
which we are acquainted” (Rev. A. M. Norman and Dr. G. 8. 
Brady in ‘ Mon. of Brit. Entom. belonging to the families 
Bosminide, Macrothricide, and Lynceide,’ p. 16). The 
same authors give for this Cladoceran only one locality in 
the British Islands, viz. Lough Bollard, Connemara. 
Note-—Our friend D. J. Scourfield, Esq., Leytonstone, 
Essex, has just informed us that he has obtained Lathonura 
on two occasions, and has seen specimens of it that were 
collected at one of the excursions of the Quekett Club to 
Staines ; and adds, “it appears to be a very rare species.” 
EXPLANATION OF THE PLATES, 
PuaTeE XI, 
Sunaristes paguri, Hesse. 
fig. 1. Female, lateral view, X 263. 2. Female antennule, X 127. 
3. Antenna, X 124. 4. Mandible, x 127. 5. Maxilla, x 127. 
6. Anterior foot-jaw, x 127. 7. Posterior foot-jaw, x 190. 
8. Foot of fifth pair, female, x 253, 9. Male, lateral view, 
x 40. 10. Male antennule, x 127. 
PuaTeE XII. 
Diaptomus laciniatus, Lilljeborg. 
Fig. 1. Female, seen from above, X 27. 
Sunaristes. 
Fig. 2. Foot of first pair, x 127. 38. Foot of fourth pair, x 84. 4. Ap- 
pendages of first abdominal segment, female, x 190. 5. Foot 
of second pair, male, X 127. 6. Foot of fifth pair and ap- 
pendages of first abdominal segment, male, x 127. 7. Last 
three abdominal seginents and caudal stylets, male, x 40. ; 
