BULLA. 203 
figures, however (of Seba, for instance), do not exhibit the cha- 
racteristic spiral strie. ‘ Mart. t. 22, f. 200, 201” has been 
added in the revised copy of the ‘Systema.’ The subcylindric 
variety mentioned in the ‘Museum Ulrice’ was probably the 
B. solida of Bruguiére, or some closely allied species. 
Bulla aperta. 
Although the description in the ‘ Systema’ is somewhat 
brief, it is sufficient to mark the modern genus (Bullea) in 
which the fragile shell should be located: the referred-to figures 
of Gualtier—one of which has the upper corner of the outer 
lip rounded, the other has it angulated—point likewise to the 
same group, being generally recognised for rude representa- 
tions of the Bullea aperta of our own shores. That species has 
consequently been almost universally accepted, until of late 
years, as the representative of the species: the African locality 
has, however, induced Philippi to consider that some allied but 
distinct shell was intended: he suggests the one which he has 
termed Schroteri; his drawing of it, however, only differs from 
the aspect of our adult native specimens in having the eleva- 
tion of the outer lip rather more angulated than usual, and 
there is no proof (nor assertion) that the delineated type was 
extra-European: moreover, Krauss, in his useful work on 
the South African Mollusca, remarks that the angle in his 
specimens from the Cape of Good Hope was not so acute as 
Philippi has represented it. In the recent monograph of the 
Bullade by Adams, his Schroteri looks exactly like our British 
examples, and, indeed, is declared to be the aperta of Montagu; 
yet it is said to come from the Philippines. I myself have re- 
ceived from the Cape an example that I cannot distinguish from 
the more corrugated British ones. Whether such an extensive 
range is possible may be doubtful; but the transference of the 
name from the traditional aperta, without more cogent reasons 
for the alteration, seems scarcely advisable. The only spe- 
cimen in the Linnean collection which at all approaches the de- 
scription in the ‘Systema’ looks exactly like Reeve’s figure 
(Conch. Syst. pl. 153, f. 3) of the British aperta, and the 
