416 MOLLUSCA. 
profundis ; limbo concinne radiato-striato ; cardinis dentibus laterali- 
bus validis. 
Lucina ramulosa, Goutp; Proceed. Boston Soc. Nat. Hist., iii. 
255. June 1850. Expedition Shells, 82. Lucia fibula, Rerve; 
Conch. Icon. 
SHELL incrassated, nearly equilateral, subcircular, moderately con- 
vex, dingy white; surface reticulated with numerous rounded, radiating 
ridges, which by divarication become constantly increased in number, 
especially at the extremities, where they become recurved, thereby 
maintaining nearly a uniform size throughout. These ridges are 
crossed by more delicate or more crowded concentric ridges, which 
are not interrupted by the radiating lines, but ride over them. The 
lines of increase are also irregular, and often exhibit distinct stages of 
growth. Beaks a little anterior and strongly antrorse, scarcely raised 
above the outline of the shell, and having a deeply excavated, broad, 
lanceolate lunule in front: the posterior dorsal margin sweeps off 
directly from the apex, and with a slight posterior truncation the 
remaining outline is circular. Interior thickly incrassated, showing 
various indentations, especially one down the centre, of a pale citron- 
yellow colour; limbus marked with fine, radiating sulcations; cardinal 
teeth delicate ; lateral ones well developed. 
Diameter one inch; breadth half an inch. 
Inhabits the Paumotu Islands, and was collected at Raraka, Cler- 
mont Tonnerre, Bellinghausen, Carlshoff, and Honden Islands. 
As much allied to L. tigrina, or L. interrupta, as to any described 
species, but is more circular, more solid, and the peculiar divergence 
of the radiating ridges, somewhat like Cytherea divaricata, are suffi- 
ciently characteristic of it. 
Figure 523, lateral view of the shell ; 523 a, inside, with the hinge ; 
523 6, dorsal view. 
CarpiTa PROCERA (Gould). 
Testa elevata, ovato-triangularis, radiatim ad quindecim-sulcata (inter- 
