530 MAZATLAN BIVALVES 
[Famitry CORBULIDA..]; 
682. ? CorsuLa ————, sp. ind. (b,) 
Tablet 2518 contains a delicate white valve, of regular Arcoid 
shape, extremely thin, with very faint radiating lines. Hinge 
with pit and tooth scarcely perceptible. 
Hab.—Mazatlan ; extremely rare, off Spondylus; L’pool Col. 
683. SpHzZNTA ————, sp. ind. 
Tablet 2519 contains a valve differing from Sph. fragilis in 
having strong sharp concentric ridges, with a few radiating 
lines. 
Hab.—Mazatlan ; extremely rare; off Spondylus ; L’pool Col. 
684. PSpHmnrIA ————, sp. and. 
Tablet 2520 contains ‘the remains of a sheli of Sphznoid 
growth, but of Myoid hinge, which was nestling in an empty 
Balanus on Uvanilla olivacea. 
Hab.—Mazatlan ; extremely rare; L’pool Col. 
{Famity- PANDORID. | 
693* P Lyonsia 
Tablet 2528 contains a minute white valve, not perfect, of 
Rupellaroid shape, but with a hinge and texture nearer to 
Lyonsia. Outside with faint irregular concentric ridges, end- 
ing here and there, on the posterior dorsal margin, in a decided 
spine. Inside with a slight anterior tooth-like process, and a 
small cartilage bed. It appears to be minutely punctate. 
When perfect, it would have measured long. '04, lat. °05, 
alé. (O12. 
Hab.—Mazatlan ; one valve in the frond of Murex nigritus; 
LI’ pool Col. 
* This species, with No. 694, have just been found in carefully cleaning the 
fonds of M. nigritus, along with another valve of Leda Elenensis, Gouldia varians, 
Lucina Mazatlanica, Alaba supralirata, &e. The numbering of the species 
is arranged so as not to break the correspondence with the listin the British 
Association Report, already printed, 
—, sp. ind. 
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