Bulletin - United States National Museum - Smithsonian Institution

210 BULLETIN 91, UNITED STATES NATIONAL MUSEUM.
tions. Outer surface of the entire shell marked by rather coarse,
concentric lines of growth and numerous, exceedingly fine, white,
evenly spaced, radiating striations.
Cat. No. 186945, U.S.N.M., contains four valves of this species
from Port Alfred (Coll. No. 315). The one selected as type is not
quite a mature specimen, measuring: Length, 41 mm.; altitude,
29 mm.
Genus LUTRARIA Lamarck.
LUTRARIA CAPENSIS Deshayes.
There are three lots of this species in the collection of the United
States National Museum, from Port Alfred, as follows: Cat. No.
187168, two specimens (Coll. No. 715); Cat. No. 249873, one valve
(Coll. No. 1145); Cat. No. 251030, another valve (Coll. No. 1547).
Family SAXICAVIDAE.
Genus SAXICAVA Bellevue.
SAXICAVA ARENACEA Smith.
There are eight lots of this species in the collection of the United
States National Museum, all from Port Alfred, as follows: Cat. No.
187179, one specimen and four valves (Coll. No. 730); Cat. No.
249874, five valves (Coll. No. 1146); Cat. No. 249875, seven valves
(Coll. No. 1147); Cat. No. 249876, four young specimens (Coll. No.
1148); Cat. No. 249879, two young specimens (Coll. No. 1151);
Cat. No. 251046, one valve (Coll. No. 1563); Cat. No. 251054, one
valve (Coll. No. 1571); Cat. No. 251057, two valves (Coll. No. 1574).
SAXICAVA LIRATA Smith.
Cat. No. 251053, U.S.N.M., one specimen from Port Alfred (Coll.
No. 1570).
Family GASTROCHAENIDAE.
Genus GASTROCHAENA Spengler.
GASTROCHAENA, species ?
Cat. No. 249871, U.S.N.M., contains one worn valve belonging to
this genus, from Port Alfred (Coll. No. 1143). It is too poor to be
properly identified.
Family PHOLADIDAE.
Genus PHOLAS Linnaeus.
PHOLAS ALFREDENSIS, new species.
Plate 44, figs. 1,2.
Shell elongate-ovate, decidedly beaked anteriorly, marked by
numerous very closely spaced, low lamellae and fine radiating riblets