38 MARSHALL: ALTERATIONS IN ‘BRITISH CONCHOLOGY,” 
The Siphobranchiata should therefore properly com- 
mence with and include Z7zforis, instead of beginning, as 
hitherto, with the Cevthiopside. 
Cerithiopsis pulchella Jeff. Dr. Watson, in a paper on the 
‘Cerithiopsidee from the Eastern Side of the North 
Atlantic’ (Linn. Soc. Journ., Aug., 1885) stated that 
pulchella was pre-occupied by C. B. Adams for another 
species, and adopted the specific name effreysz ; but Conti, 
in his ‘ Fossiles di Monte Mario,’ had previously called it 
concatenata, which name should stand. 
Cassidaria echinophora L. (See J. of C. for April, 1894). 
Trophon truncatus Strom. Admittedly a variety of 7: cla- 
thratus Linné, which does not occur in our seas except as a 
glacial fossil. The name, however, should remain as it is, 
for the reasons given under Léssoa abyssicola, R. costulata, 
etc: 
Nassa nitida Jeff. This is so obviously a variety of WV. vede- 
culata, that it has been tacitly ignored as a species as 
published in ‘ British Conchology.’ Moreover, only some 
specimens from the Thames and Orwell answer to Jeffreys’ 
description, while others partake more or less of the 
characters of the type. These are—turreted whorls, 
fewer and broader ribs, and absence of tubercles on the 
inner lip. The turreted whorls are certainly peculiar, 
but the number of ribs in the type are exceedingly variable, 
being nearly twice as many in some specimens as in others, 
there being, in fact, no two specimens alike in this respect, 
while the absence of tuberculation on the inner lip is owing 
to the want of carbonate of lime, those on the outer lip 
being much fainter than the type, and the shell generally 
thinner. As to the number of ribs, I have typical speci- 
mens which are quite as sparsely ribbed, and which are also 
without the usual reticulations. 
Columbella haliaéti Jeff. Dr. Jeffreys, reporting on the results 
of the ‘Triton’ cruise, stated that this species should be 
J.C., yiii., Apr. 1895. 
