OF THE ANTWERP CEAG. 385 



rather convex, with a slight sinuation in the middle. Outline, seen dorsally, oblong, 

 subpentagonal, widest near the posterior extremity ; greatest width equalling half the 

 length ; anterior extremity broad, subtruncate, and slightly emarginate in the middle ; 

 posterior tapering abruptly to a bifid submucronate point. End ^dew broadly subtri- 

 angular. Surface of the shell somewhat undulated and marked with impressed puncta, 

 which are irregularly scattered and of various sizes, being larger towards the anterior 

 and ventral margins, where they are arranged more or less regularly in the direction of 

 longitudinal furrows. The left valve is larger than the right ; and the junction of the 

 valves on the hinge-line is marked on the dorsal surface by a deep longitudinal 

 depression. Length ^ inch (1-1 millim.). 



This species seems to be of rare occurrence, only one or two examples having been 

 noticed in the zones " a Bryozoaires " and " Isocardium cor." It approaches closely to 

 Speyer's Cythere millepunctata, with which I was at one time disposed to identify it ; 

 and I am not sure that Speyer's figures may not represent the young form of the species. 



Cytheee jueinei, Miinster. (Plate LXV. figs. 2 «-2 h.) 



Cythere jurinei, Von Miinster, Jahrbuch fiir Mineralogie, &c., 1830, p. 60, et 1835, p. 445 



(fide Bosquet) . 

 Cythere jurinei, Riimer, op. cit. 1838, p. 516, pi. vi. fig. 12. 

 Cythere jurinei, Bosquet, Entom. fossil, des terrains Tertiaires de la Prance et de laBelgique, p. 56, 



pi. ii. figs. 9 a, *, c, d (1852). 

 Cythere jurinei, idem, var. /3. tenuipunctata, op. cit. pi. ii. figs. 10, a, b, c, d. 

 Cythere jurinei, Egger, Die Ostrak. der Miocan-Schichten bei Orenburg in Nieder-Bayern (1858) 



p. 20, pi. iii. fig. 5 (icones malae), var. ovata, pi. iii. fig. 4. 

 Cythere jurinei, Speyer, Die Ostrac. der Casseler Tertiiirbildungen (1863), p. 15, pi. ii. fig. 5. 

 ?Bairdia semipunctata, Bornemann, "Die mikroskopische Fauna des Septarienthones von Herms- 



dorf bei Berlin," Zeitschrift d. deutsch. geol. Ges. 1855, p. 359, pi. xxi. fig. 1. 



Carapace, seen laterally, oblong, higher in front than behind, the greatest height being 

 equal to half the length; anterior extremity obliquely rounded, posterior rounded, 

 often much narrowed and produced ; dorsal margm very gently arched, ventral slightly 

 sinuated in the middle. Seen from above, the outline is oblong-ovate, tapering towards 

 each extremity, the greatest width situated behind the middle. The surface of the 

 shell is either quite smooth, or marked along the middle or on the lower half of each 

 valve with small impressed puncta, usually faint and arranged in cui-ved longitudinal 

 furrows. The right valve is smaller than the left, and is abruptly sinuated at each end 

 of the dorsal margin. Length -^ inch (I'l millim.). 



Figs, e-h represent, as I believe, the adult form of the species, whereas an immature 

 sta<fe is shown in the figures a-d, which also seem to be identical with the var. |3. tenui- 

 punctata of M. Bosquet. It is not uncommon in recent Ostracoda to find the young 

 marked with delicate sculpturing, which disappears in advanced age ; the shape and 



