210 
DESCRIPTION OF THE FOSSILS. 
Modiola elongata. Ph. PI. V. fig. 24. Bolland. 
Elongate, arcuate, margins subparallcl, valves gibbous, subcarinated. 
Modiola granulosa. Ph. PI. V. fig. 23. Northumberland ; Bolland. 
Very elongated, depressed, surface granulose. 
Cuculraja obtusa. Ph. PI. V. fig. 19- Bolland. 
Twice as wide as long, gibbous, oval, front indexed ; surface undulated ; reticulated 
in the posterior slope near the hinge. 
Cucullsea arguta. Ph. PI. V. fig. 20. Bolland. 
Ovato-rhomboidal, posteriorly angulate ; neat furrows parallel to the margin. (The 
figure is partly restored at the extremities.) 
Nocula cuneata. Ph. PI. V. fig. 14. Bolland. 
Ovato-cuneiform, beaks near one end ; radiating striae and concentric undulations. 
Nucula tumida. Ph. PI. V. fig. 15. Bolland; Bowes; Northumber- 
land ; Kulkeagh, Ireland. 
Gibbose, ovate, concentrically striated ; beaks tumid. 
Nucula undulata. Ph. PI. V. fig. 16. Bolland. 
Transversely ovate, depressed; with delicate concentric striae; a ridge on the pos- 
terior slope. 
Nucula claviformis? Sow. PL V. fig. 17. Harelaw, and Otterburn, 
Northumberland ; Bolland. 
Subconical, anterior side extended. Surface delicately striated across. Mr. 
Sowerby says N. claviformis is truncated at the end. I have lately seen the end of my 
species, it is rounded, but nearly brought to a point. 
Nucula brevirostris. Ph. PI. V. fig. 11 a. Harelaw, Northumberland. 
Ovate, anterior side attenuated, obtuse ; surface neatly striated across. 
Nucula luciniformis. Ph. PI. V. fig. 11. Bolland. 
Obliquely ovate, depressed, smooth ; posterior slope ridged ; posterior end truncate. 
Pleurorhynchus. — I propose this name for several singular fossils 
ranked provisionally with cardium by the late Mr. Sowerby. Their 
relation to existing genera is very slight and obscure. 
P. hibernicus (Cardium Sow.) PI. V. fig. 26, (reduced) Queen’s County ; 
Bolland ; Mendip. 
Shaped like a horse’s hoof; the base, which is the truncated anterior face, rises near 
the hinge into a conical umbo or rostrum ; radiating stria;. 
P. minax. Ph. PL V. fig. 27. Bolland ; Kildare. 
Anteriorly gibbous, and rounded; posteriorly elongate; rostrum attenuated; 
radiating furrows equal. (The lower figure of C. aliforme S. t. 552, appears to belong 
to this species.) 
