OF THE ANTWERP CRAG. 403 
very small sete. Jaws as in Cytherura. Feet long and slender, terminal claws slender. 
Abdomen ending in a long, narrow process; postabdominal lobes bearing three short 
hairs. Copulative organs of the male armed behind with three spiniform processes, 
one of which is trifurcate. Eyes wanting. 
CYTHEROPTERON LATISSIMUM, Norman. (Plate LXIX. figs. 1 a—1 d.) 
Cythere latissima, Norman, Nat.-Hist. Trans. Northumberland and Durham, vol. i. p. 19, pl. vi. 
figs. 5-8 (1865) ; Brady, Trans. Zool. Soe. vol. v. p. 381, pl. Ixii. figs. 4a-e (1866). 
Cytheropteron converum, Sars, Oversigt af Norges marine Ostrac. p. 80 (1865). 
Cytheropteron latissimum, Brady, Monog. Recent Brit. Ostr. p. 448, pl. xxxiv. figs. 26-30; Brady, 
Crosskey, and Robertson, Monog. Post-tert. Entom. Scotland, &e. p. 202, pl. vii. figs. 19-23. 
Carapace, as seen from the side, subovate, highest in the middle, height equal to two 
thirds of the length; anterior extremity rounded, posterior rounded but angulated 
above, scarcely beaked; dorsal margin boldly and evenly arched; ventral convex, 
sinuated in front. Seen from above, nearly rhomboidal, greatest width behind the middle 
and equal to two thirds of the length, extremities acuminate. End view equilaterally 
triangular, sides convex. Surface marked with oblong pits, which are arranged in 
flexuous transverse grooves; ventral surface longitudinally furrowed ; lateral aleeform 
process rounded and not very prominent. Length 3; inch (0°60 millim.). 
This species is widely distributed in the present day over the North Sea, and as far 
as Baffin’s Bay and Spitzbergen. It occurs commonly as a fossil in the Post-tertiary 
beds of Scotland, at Bridlington in England, and also in Canada. The specimens here 
described are from the Panopea-bed (Sables inférieurs), and the zone a Bryozoaires 
(Sables moyens). 
CYTHEROPTERON INTERMEDIUM, noy. sp. (Plate LXIX. figs. 3 a-3c.) 
Carapace, as seen from the side, oblong, rounded in front, produced behind into a 
broad obtuse median beak; dorsal margin moderately arched, ventral nearly straight. 
Seen from above, rhomboidal, greatest width situated behind the middle, and equal to 
two thirds of the length; the lateral margins end abruptly in a rectangular projection 
behind the middle, the hinder third of the shell being much narrower, and forming 
an acutely tapering process ; the anterior extremity is also sharply pointed. End view 
triangular, with nearly straight margins and acute angles. Surface of the shell slightly 
furrowed transversely, otherwise smooth. Length 3/5 inch (0°50 millim.). 
A few examples only were found, in the Panopwa-bed (Edeghem). 
CYTHEROPTERON GRADATUM (Bosquet).. (Plate LXIX. figs. 4a—4 d.) 
Cythere gradata, Bosquet, Entom. fossil. terr. Tertiair. France, &c. p. 127, pl. vi. figs. 11 a-d (1852). 
Cythere papilio, Egger, Ostrak. der Miocin-Sch. Orenburg, p. 42, pl. vi. fig. 9. 
Cythere bilacunosa, Speyer, Die Ostrac. Casseler Tertiarbild. p. 34, pl. iv. fig. 6 (1863). 
Carapace, as seen from the side, oblong, quadrangular, slightly higher in front than 
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