KNOWN SPECIES OF MARINE OSTRACODA. 379 
marked with longitudinal rows of punctations, coalescing on the ventral surface into 
grooves or striz. End view cordate. 
Length zy in. (54 mm.). 
Hab. Levant (sponge-sand). 
17, CyrHere pumicosa,n.sp. (Pl. LXI. fig. 3, a—c.) 
Carapace oblong, convex, quadrilateral, considerably elevated, and marked more or 
less distinctly with two sigmoid ridges and an intervening depression. Anterior 
margin broad, somewhat flattened, with rounded angles; posterior rounded, denti- 
culate. Dorsal margin nearly straight ; ventral slightly sinuated. Dorsal profile ovate. 
Surface-sculpture consisting of angular excavations of irregular shape, but mostly 
oblong and disposed in longitudinal series. 
Length zo in. (63 mm.). 
Hab, Turk’s Island (shallow water). 
18. CyrHere crisrirormis, n.sp. (Pl. LXI. fig. 6, ad.) 
Subquadrangular, trapezoid, convex ; margins (except the ventral) strongly and irre- 
gularly toothed. Eztremities straight, with rounded angles, converging towards the 
dorsum. Dorsal border straight; ventral convex, emarginate, and nearly devoid of 
spines. Dorsal aspect broadly ovate. Surface of the carapace covered with a strong, 
elevated reticulation enclosing angular cells of irregular shape, the whole structure 
being very similar in appearance to the caleareous plates of some of the sea-cucumbers. 
Length 35 in. (‘74 mm.). : 
Hab. Levant (sponge-sand). One specimen. 
19. CyrHERE NoRMANI, n.sp. (PI. LXI. fig. 5, a—d.) 
Carapace convex, trapezoid in outline. Dorsal and ventral margins slightly arched 
outwards. Anterior margin beset, along its inferior half, with long, blunt teeth. 
Posterior margin armed with two or three strong teeth and several smaller ones. 
Dorsal aspect oval, with several projecting spines towards the extremities. Surface 
covered with a network of sharply defined ribs, crossing each other nearly or quite at 
right angles, but becoming less distinctly angular towards the edges of the valves. A 
sharp keel, bearing posteriorly a single strong spine, runs along the lower border, and 
mostly bifurcates on the ventral aspect, the upper branch being continued along the 
posterior border of the valve to the dorsal margin, thus bounding the reticulated 
portion of the shell. 
Length 3; in. (‘78 mm.). 
Hab. Abrolhos Bank. Several specimens, 
The only described species which bears any close resemblance to the present is 
C. arachnoidea, Bosquet. It differs from C. normani in outline, also in having a row of 
3 D2 
