454 Recent Ostracoda from the Gulf of St. Lawrence. 
Cytherura undata, Sars, var. (Pl. XIX. fig. 7.) 
A specimen which I suppose to belong to C. undata differs 
enough to make it worth while to figure it. The difference 1s 
chiefly in surface-sculpture, but slightly also in outline. 
Cytherura pumila, C., B. & R., and Cytherura concentrica, 
C, D. & H. 
These species have already been figured and described (in 
MS.) by the author in conjunction with Messrs. Crosskey and 
Robertson, from fossil posttertiary specimens; and l have 
not thought it right here to forestall those descriptions, the 
publication of which I hope may not be long delayed. 
Oytherideis foveolata, nov.ep. - (Pl. XIX. figs. 1-3.) - 
Carapace elongate, compressed ; seen from the side, siliquose, 
slightly depressed in front; greatest height situate about 
the middle, and equal to rather more than one-third of the 
length; extremities rounded, the anterior much the nar- 
rower: superior margin almost straight, inferior slightly 
sinuated in the middle. Seen from above, elongate ovate, 
widest near the middle, tapering gradually toward the front, 
more abruptly behind ; extremities acuminate ; width equal 
to one-third of the length.  Shell-surface smooth, minutely 
yas somewhat densely punetate, semitransparent, horny. 
ch. 
ength 4'- inch 
Nearly allied to C. subulata, Brady, but more robust and 
more densely punctate. 
EXPLANATION OF PLATE XIX. 
Cytherideis foveolata, carapace, seen from the left side. 
. The same, seen from above. > x40. 
3. The same, seen from below. 
. 4. Cythere canadensis, carapace, seen from the left side. 
5 bove. > x50. 
; same, seen from the front. 
7. Cytherura undata, var., carapace, seen from thé left side. x 84. 
- here Dawsoni, carapace, seen from the left side. 
9. The same, seen from above. > x50. 
10. The same, seen from below. 
11. Cythere leioderma, carapace, seen from the left side. 
12. The same, seen from above. 
13. The same, seen from behind. 
| x40. 
———— E EEE 
