PLATE XCIV. 
I, 2. Pholas Cylindrica. ( Cylindrical Pholas.) Transverselyeiongated, compressed, cylindrical; posterior 
side muricated, pointed, with small sinus in edge ; beaks concealed by a reflection of edges of back; surface, 
with transverse striae ; with many, longitudinal elevations, with flat spines. 
3,4,5. P. Compressa. (Compressed Pholas.) Transversely obovate, compressed; sides equally rounded; 
gaping at each end ; with longitudinal ridge and corresponding sulcus along middle of valves; surface, with 
many, concentric ridges, decussated by eight or ten, longitudinal ridges anteriorly; the whole, with minute, 
longitudinal striae. 
6, 7. Panopaea Ovalis. (Ocal Panopcea.) Transversely oval, convex ; beaks near anterior side ; posteriorly 
rounded, gaping ; surface smooth. 
8. 19, 20. P. Crispata. ( Crisped Pholas.) Transversely sub-oval; anteriorly acuminated, reflected; with 
longitudinal sulcus from behind reflection to margin; posteriorly nearly plain, or with a few, concentric 
wrinkles; anteriorly, with many, undulating wrinkles and longitudinal grooves; with large, curved tooth 
internally. 
9. Solen Parisiensis. (Parisian Solen.) Transversely oblong-ovate, with medial sub-sinus; surface, with 
longitudinal, imbricated striae ; hinge, with one tooth in one valve, and two in the other. 
10. P. Plicata. ( Plaited Panopcea.) Transversely oblong, cylindrical, ventricose ; anteriorly truncated, 
gaping; posteriorly short, narrowed ; beaks obtuse ; surface, with concentric, shallow ridges. 
II, 12. P. Dactylus. ( Date Pholas.) Transversely elongated ; umbonal region reflected, with series of cells 
externally, and with two, concentrically striated valves ; with a long, spatuliform, accessorial valve posteriorly; 
surface anteriorly, with waved ribs, decussated by longitudinal striae ; posteriorly smooth, with shallow lines of 
growth. 
13. S. Legumen. ( Pea-pod Solen.) Transversely elongated, compressed, tliin ; hinge, with two, erect, 
recurved, cardinal teeth in one valve, and one erect, thin tooth in the other ; surface smooth ; rounded at both 
sides. 
14. S. Siliqua. ( Pod Solen.) Transversely elongated, straight, sub-cylindrical, inequilateral ; hinge, with 
single, thin, compressed tooth in one valve and elongated, lateral laminae, and with two teeth in the other; 
lower area transversely striated, with distant lines of growth ; surface smooth. 
15. S. Pelagicus. (Sea Solen.) Transversely elongated, straight, lancet-shaped, rounded at both ends; 
with small beak at broader end ; with keel-like ridge from beak to posterior margin. 
16. S. Affinis. ( Allied Solen.) Transversely elongated, arcuated, thin, compressed ; gaping at both sides ; 
hinge near one side ; surface smooth. 
17. S. Ensis. ( Sabre Solen.) Transversely elongated ; arcuated and truncated at both ends; hinge, with 
simple, cardinal tooth in one valve, with two in the other, which has a strong, recurved, cleft tooth; with striae 
like S. Siliqua. 
18. S. Vaginalis. ( Vagina-like Solen.) Linear, straight; end of margin oblique; hinge, with one triangular 
tooth. 
21. P. Constricta. (Constricted Pholas.) Transversely elongated ; anteriorly short, rounded, truncated ; 
posteriorly constricted, acuminated ; with sulcus from internal region to base ; surface, with longitudinal ribs. 
22. P. Reeondita. ( Recondite Pholas.) Transversely ovate ; rounded at both sides ; with oblique, longitu¬ 
dinal sulcus ; with transverse striae. 
23. 24. P. Candida. (White Pholas.) Transversely elongated ; pointed anteriorly; umbonal region, covered 
by elongated, accessory plate ; surface, with wide-set, longitudinal and transverse striae. 
25. P. Prisca. (Ancient Pholas.) Oblong-oval ; anteriorly short, rounded, with deep, angular sinus in edge; 
posteriorly lengthened, truncated; beaks covered by cordiform, accessory valve ; with longitudinal band in 
centre of each valve. 
( H3 ) 
