206 . Mr. E. A. Smith oz 
XVIUI.—Diagnoses of new Species of Pleurotomide in the 
British Museum. By Epaar A. SMITH. 
THE following descriptions have been written some time ; 
and it was hoped that when published they would be ac- 
companied by figures. This is very necessary considering 
the extent of the family, but not at present practicable. 
Nearly thirteen hundred recent species have been described ; 
but many of these have already proved identical with others, 
and a good many more will no doubt, on further investigation, 
fall into the same category of bad species. 
‘The object of having these diagnoses printed now is to 
prevent the distribution of manuscript names, which frequently 
occasions a great waste of time and labour. 
Pleurotoma (Clavus) alboangulata. 
Testa ovato-fusiformis, saturate fusca, strigis conspicuis albis 7 ab 
apice supra costas radiantibus ornata; anfract. 9, planiusculi, 
superne leviter constricti, costis obtusis albis 7 supra spiram con- 
tinuis instructi; anfr. ultimus costis ad peripheriam eyanidis di- 
midio infero omnino saturate fusco; apertura parva, longitudinis 
totius 2 equans, intus purpureo-fusca ; columella callo erassius- 
culo purpurascente ad suturam tuberculato induta; sinus medio- 
cris; canalis perbrevis, subangustus. 
Long. 20 mill., diam. 7. 
Hab. 
This species is very remarkably coloured. The seven 
white stripes radiating from the apex down the continuous 
ribs as far as the middle of the body-whorl contrast very 
markedly with the deep-brown ground-colour of the shell. 
Pleurotoma (Clavus) spinosa. 
Testa acuminato-ovata, saturate fusca, supra costarum medium albo 
tincta; anfract. 9, superne concavi, in medio acute angulati, 
costis medio aliquanto spinose acuminatis, superne versus sutu- 
ram obsoletis (in anfr. ult. 8 paululum ante basim evanidis) in- 
structi; anfr. ultimus aliquanto infra medium punctorum alborum 
seriebus duabus supra costas ornatus, circa caudam spiraliter 
striatus ; apertura purpureo-fusca, longitudinis teste 2 vix 
eequans ; columella superne valde tuberculata ; ; sinus latus ; "cana- 
lis brevissimus. 
Long. 15 mill., diam. 53. 
Hab. ——? 
The nearest ally of this species is P. deta, Hinds. The 
acute spine-like projections of the ribs are white ; and the rest 
