CLASS PELECYPODA 
101 
Cuspidaria pectinata Carpenter, 1864. 
Sappl. Rcpt. Brit. Assoc., 1864, p. 637. Proc. Acad. Nat. Sci. Phila., 1865, p. 54. 
N. t. globosa, albida, subdiaphana; epidermide tenui induta; ventriliter 
antice producta, postice subito angustato, rostrato; haud insculpto, duabus 
inter quinque partes totius longitudinis sequante; parte globosa acute 
costata; costis posticis paullum majoribus, magis distantibus; margines 
dorsales versus obsoletis; interstitiis latis, quadratis, minutissime concen- 
trice striatis; costis principalibus t. jun. xii.-xv., adulta, aliis crebre inter- 
calantibus, circ. xxx., quarum primi majores: intus, lamina cartilaginea 
curta, sub umbones celata; dente postico satis elongato, regione adductoris 
intus claviculato; cicatricibus adductoribus subrotundatis, deorsum sitis; 
sinu pallii parvo, lato; margine a costis pectinato. Long., .24; lat., .14; 
alt., .12 of an inch. (Carpenter.) 
Shell small, globular, attenuated and gaping behind, thin; umbos 
anterior; dorsal line straight; anterior extremity evenly rounded; posterior 
extremity drawn out to a very long, narrow, truncated beak; ventral 
margin greatly arcuate; surface sculptured by twelve prominent, sharp, 
radiating ridges; posterior elongation smooth; cartilage-process spatulate, 
with an obsolete tooth in front. (Arnold.) 
Type in British Museum? Type locality, Puget Sound. 
Range. Puget Sound to Panama Bay. 
Cuspidaria californica Dali, 1886. 
Plate 5, fig. 14; Plate. 34, fig. 3. 
Ball. Mas. Comp. Zool., 12:6:296. 
Shell dififering from C. pectinata by its smaller size and proportionately 
greater length; larger number of ribs (16-20, while pectinata averages 
12-14) ; its straighter, longer rostrum with but two strong radiating lirae 
extending to the lower extreme ( pectinata has none, or only several fine 
ones near the body of the valve) ; its less inflated shape and paler, more 
delicate epidermis. Color yellowish white; ossicle as usual; buttress present 
in right valve. Long, of shell, 7; of rostrum, 2.5; alt. of shell, 3.6; 
diam., 2.75 mm. (Dali.) 
Type in U. S. N. M. ? Type locality, Catalina Island, California. 
Range. Puget Sound to San Diego, California. 
Cuspidaria oldroydi Dali, 1924. 
Plate 5, fig. 13. 
Publ. Paget Sound Biol. Station, 4:33; pi. 1, fig. 14. 
Shell small, short, inflated, chalky white with a pale olivaceous perios- 
tracum; beaks prominent, rounded; valves slightly inequilateral, the left 
