PALAEONTOLOGY OF THE SURVEY. 
195 
PERNA, Lam. 
Perna Montana, PI. —, fig. —.—Elevated, anterior margin nearly straight; hinge line 
slightly incurved. 
Locality. —San Buenaventura, Santa Barbara county. 
An imperfect cast, about 4f inches in height, allied to P. maxillata , of Virginia, from which 
it differs in having a straighter front and incurved cardinal margin. (Not illustrated.) 
UNIVALVES. 
TROCHITA. 
Trochita costellata, PL 7, fig. 3.—Convex or convex-depressed; volutions 3f ; suture 
distinct; surface irregular, and marked by radiating interrupted ribs, which are obsolete or 
wanting above, and distinct, though little prominent, towards the periphery ; apex not central 
and slightly prominent. 
Locality. —Gaviote pass. 
A cast in sandstone. There are two very perfect casts, one more elevated than the other, 
with a less distinct suture and radii. 
TURRITELLA,. Lam. 
Turritella Inezana, PI. 8, fig. 4. —Subulate, thick; sides of volutions straight, with an 
obtuse carina on each side of the suture, and contiguous to it. 
Locality. —Santa Inez mountains. 
A large species with the last volution If inch wide. The specimen is an imperfect cast with 
portions of the crystallized shell remaining. There are traces of 2 or 3 revolving lines on one 
of the volutions. 
Turritella variata, PI. 8, fig. 5. —Subulate, volutions with straight sides, each with 4 to 
6 revolving prominent ribs, body whorl with a broad furrow revolving above the angle of the 
base. 
Locality .—Santa Inez mountains. 
A variable species ; one specimen of which shows 2 revolving lines on the upper part of each 
whorl distant from 3 equidistant ribs beneath, all nearly or quite equal in size. Others have 
6 unequal equidistant ribs ; hut I believe the species is always excavated at base. 
NATICA. 
Natica Inezana, PI. 10, figs. 5 and 6.—Suhglobose; whorls5 ; spire prominent; volutions de¬ 
pressed or slightly channelled above, scalariform; umbilicus of ovate-acute outline, patulous 
towards the base. 
Locality. —Santa Inez. 
A large species, abundant, hut the specimens are imperfect. Portions of the shell remain on 
the cast, and are crystallized. Height 2f inches. 
MULTI V AL YES. 
Balanus Estrellanus, PL 8, fig. 1.—Very large, subconical, not elevated; valves sculptured 
with close, undulated, or very irregular radiating lines. 
Locality. —Estrella. 
Height about 2 inches ; width 2f inches. A single specimen is in the collection, with its ex¬ 
ternal characters almost obliterated. 
