234 
Differs from G. striatus, Brod. (which must not be confounded 
with Dispotea striata, Say), in its much more delicate, irregular, 
finely spinous strize ; and in the form of the internal lamine, which 
in this species is reflected back over two-thirds, in G. striata over the 
whole, forming a much larger umbilical region. The vertex of this 
shell is rather prominent, and is formed like a tumid Planorbis, with 
a sunken apex. 
19. FissuRELLA NIGROCINCTA. 
F. t. ovali, lata, conica ; alba, lineis nigris radiantibus eleganter 
picta ; striis radiantibus tenue celata ; apertura subcentrali, ob- 
scure trilobata; intus alba, margine tenue crenulato, denticulis 
nigris ; callositate alba, linea nigra cincta. 
Long. °75, lat. *52, alt. *3, poll. 
Differs from the young of F’. alba in its greater breadth, less com- 
pressed growth, finer strize and crenulations; from F’. nigropunctata, 
in the black line round the callosity ; and from both in the form of 
the hole, which is trilobed, not contracted in the middle. 
20. Cattoroma (TurRBO) ?FLUCTUATUM, var. DEPRESSUM. 
C. t. valde depressa, anfractibus v., quarum ultimus tumidus, sutura 
impressa ; liris spiralibus circiter xxx., quarum plerumque v. 
majores sunt, subrugosis ; viridi, punctis albis transversim in liris 
subirregulariter dispositis ; apertura ad basin posteriusque pro- 
ducta; columella paulum excavata, non umbilicata. 
Long. 2°02, lat. 2°04, long. spir. *78, poll. ; div. 110°. 
Hab. California. Mus. Cuming. 
Syn. Turbo fluctuatus, var., Rve. Conch. Ic. pl. viii. f. 34. 
Among many hundred specimens examined of the true C. fluctuatum 
from the Mazatlan Collection, there was not one approaching this 
shell. Nevertheless, as there is in the British Museum a somewhat 
intermediate form, it may possibly be a variety of that species. The 
operculum is unfortunately wanting in Mr. C.’s specimens : until that 
has been examined, the point must remain in abeyance. 
21. Liriora DIvIsA. 
L. t. parva, anfractibus ix., quarum vi. primi subturriti, liris trans- 
versis striisque spiralibus decussati, ultimique tres subleves sunt, 
tumidiores, striulis plus minusve appressis, spiralibus, maxime ad 
basin, tenuissime ornata; nonnunquam linea suturam impressam 
subeunte ; subdiaphana, fusca ; labro acuto ; labio vie monstrante; 
columella truncata, infra maxime undata. 
Long. °13, lat. -06, long. spir. *07, poll. ; div. 30°. 
Hab. Cape San Francisco: legit clar. Hinds. Mus. Cuming. 
This is the only species hitherto recorded from the west coast of 
N. America; the ?Z. saxicola of C. B. Ad. not belonging to the 
genus. Exactly the same species was taken in abundance “‘ among 
small drifted canes, Straits of Sunda,’’ Mus. Archer. It is remark- 
able for the different character of the first six and the last three 
