372 MR. G. S. BRADY ON NEW OR IMPERFECTLY 



ventral margins. The lower portion of the posterior border often much produced and 

 toothed. Surface of the valves smooth or marked with all varieties of sculpture. 



1. Cythere setosa, Baird. (Pi. LVIII. fig. 12, a-c ; fig. 13, a-d ; fig. 1.5, a-e.) 



Cy there setosa, Baird, Proceedings of Zoological Society of London, part xviii. 1850, p. 258; Annu- 

 losa, pi. 18. f. 28-30. 



Valves obiong-oval or subreniform, compressed, highest at anterior third, surrounded 

 wholly or in part by a broad flattened fillet. Dorsal margin arched, somewhat flattened. 

 Ventral margin sinuated. Extremities broad, obliquely rounded. Dorsal aspect oblong- 

 oval, keeled, often slightly indented near the middle. End view broad, oval. Surface 

 smooth or slightly pitted, and bearing a few short hairs. 



Length jL in. (young), -gViro in. (adult), (•5--74--84 mm.). 



Hab. Hunde Islands {Dr. P. C. Sutherland's dredgings). Levant. 



2. Cythere jurinei. Von Miinster. (PI. LIX. fig. \,a-f.) 



Cythere jurinei, Von Miinster, Leonh. & Bronn's Jahrbuch, 1830, p. 62. Bosquet, Entom. Fossil, des 

 Terr. Tertiair. de la France, p. 56. pi. 2, fig. 9. Speyer, Ostrac. der Casseler-Tertiarbild. p. 15. 

 t. 2. fig. 5. 



Oblong , convex; extremities equal, or nearly so. Dorsal margin straight, ventral 

 slightly sinuated. Extremities ohViquely rounded. Dorsa/ ^ro/f/e elongate, ovate. Sur- 

 face of the valves marked with shallow (scarcely excavated) longitudinal grooves, along 

 which are scattered faintly marked pittings. Lucid spots about six, rather small, 

 circular, arranged in two transverse rows. 



Length ^ in. (-84 mm.). 



Hab. Levant (sponge-sand). 



This is a well-marked species, which, however, varies considerably in the amount of 

 surface-marking, the grooving and pitting being often almost or entirely obsolete. The 

 longitudinal strise are very shallow, more like facets than grooves, looking as if they 

 might have been produced with a joiner's plane rather than with a gouge. The pittings, 

 when well marked, remind one strongly of the appearance of a section of coniferous 

 wood under the microscope. 



Var. COST ATA. (PI. LIX. fig. 2, a-d.) 



Oblong, subquadrangular. Extremities obliquely rounded, the anterior being broadest. 

 Dorsal and ventral margins nearly straight, the former sloping backwards from the 

 anterior hinge-joint. Dorsal aspect oblong subovate, only slightly narrowed in front : 

 outline somewhat sinuous. Surface marked with delicate longitudinal ridges, which, 

 on the central portion of the valves, are connected at distant intervals by oblique cross- 

 ridges. The furrows are dotted with small pits, often arranged in pairs. 



Length -^ in. ('63 mm.). 



Hab. Levant (sponge-sand). 



