ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 529 
Plate. Fig. 
2. Penitella xilophaga, Val. {may he the adult of fig. 4}. 
. Penitel a tubigera, Val. [may possibly be intended for Ph. penita]. 
» Pholas rostrata, Val. [is probably = Netastoma Darwinii, Sby. jun. ]. 
. Ungulina luticola,Val. [may be an extremely bad Petricola ielea 
- Corbula luticola, Val. [1s probably = Sphenia fragilis}. 
- Bornia luticola, Val. Laperoussit |. 
- Saxicava clava, Val. |=. legumen, Desh.,= 8. pholadis, var.]. 
The identification of these species is attended with great uncertainty, as 
the types have not been seen, and the artist appears to have studied effect 
rather than accuracy. 
42. Voyage of Sulphwr.—The types of these species appear to have been 
scattered. Only a part are now to be found in the very valuable collection 
of Admiral Sir E. Belcher, in which most of the shells are, unfortunately, 
destitute both of names and of locality-marks. 
Murex Belcheri [belongs to Purpuride, and may be considered the type of 
the genus Chorus]. 
Ranella Californica. (After comparing a series with the Cumingian speci- 
mens of 2. ventricosa, it appears that the diagnostic characters are not con- 
stant. 
Me pine sapotilla. [The type in Mus. Cuming is much smaller than 
the ordinary condition of M. prunum=cerulescens, Lam., to which species 
the common Panama shells were referred by Mr. Cuming. In his collection, 
however, they stand thus :—Ordinary Panamic type “ sapotilla, Hds.: 5-13 
fms., sandy mud, Panama, H.C.” Another tablet of the true Panama shells 
“ Marginella, n. sp., Panama,”—‘ San Domingo” having been crossed out. 
The small West Indian form, analogous to the typical sapotilla, is given as 
“glans, Mke.” The large West Indian shells, with violet tinge behind the 
labrum, are “ cerulescens, Lam., Panama,” without authority. Another series 
of the W. Indian type is given as “ cerulescens, var., Lam., 10 fms., sandy 
mud, Panama,” without authority. Either habitat-errors have crept into the 
Cumingian labels, or else Mr. Redpath’s observation will not hold, viz. that 
the Atlantic shells have a posterior pinch on the labrum, which is not seen 
in the Pacific. All the authentic series examined from the two coasts bear 
out his view. There will be two opinions as to whether this be more than 
a mere local distinction. ] 
Solarium quadriceps. {On comparing suites of S. granulosum from the 
Texan coast with series from the Gulf of California, it appeared that on each 
side of the Peninsula the shells went through similar changes in strength of 
sculpture, size of umbilicus, number of spiral granules, &e.; nor could any 
elue be obtained by which the coasts could be separated in a mixed collection. 
Hinds’s shell stands at the furthest extreme of removal from S. granulatum. | 
43. U.S. Exploring Expedition.—The shells of this collection were depo- 
sited in the Patent Office in Washington, D.C., where, notwithstanding the 
great care of Mr. Varden, the curator, they were not a little tampered-with. 
Dr. Gould laboured under great difficulties in his work of description; he 
had access only to that part of the collection which happened to be unpacked 
and exposed to view during the brief period that his professional engagements 
allowed of his visiting the capital; and his request to be allowed to take 
doubtful shells to Europe for identification was refused. The materials also 
were of an unsatisfactory kind, a large proportion of the specimens being 
much weathered, and many of the locality-marks being manifestly erroneous. 
If occasional errors have been detected in his great work, they may fairly be 
set down to causes over which the author had no control. Many of these 
1863. 2M 
CONIC? Or CO 
