200 SPECIES OF THE SYSTEMA. 
a synonymy. “ Mart. Sys. t. 22, f. 205, 206” has been added, 
and rightly so, in the manuscript of Linneus, and “711, f. 65” 
(the modern numbering) been substituted for the original more 
circuitous mode of reference to Lister’s ‘ Historie.’ 
Bulla bolba. 
The Ovulum volva of Sowerby’s ‘ Thesaurus’ (vol. u. pl. 99, 
f.6, 7) is present in the Linnean cabinet, and alone agrees with 
the description and appended synonymy. ‘ Knorr, Conch. 5, 
t. 1, f. 2,3; 6, t. 82, f. 1” is added in the copy that belonged to 
the younger Linné. The locality is erroneous ; the shell beimg 
a native of China. j 
Bulla bivestris. 
Two long-beaked Ovule were known to Linneeus, one (volva) 
characterised by the striation of its beaks, the other (the shell 
under consideration) by their smoothness. Now since the ex- 
tremities in the Ovula birostris of authors (Sow. Thes. Conch. 
pl. 100, t. 66) are plainly striated, and the beaks, moreover, are 
not, as asserted of the type, as long as the central portion of 
the shell, “ rostra sequalia levia, fere ventris teste longitudine,” 
it is manifest that the received identification is erroneous. The 
required features may be found in the O. longirostrata of Sow- 
erby (Thes. Conch. pl. 100, f. 59, 60), which answers perfectly 
to the rest of the description. Both these shells (the former a 
white specimen, the latter pink and sadly broken) are placed 
together in the same box in the Linnean collection, and are the 
only species in the cabinet whose characters at all agree with 
those ascribed to Bulla birostris. In the revised copy of the 
‘Systema’ there is added “ Variat albo, rostris ventre breviori- 
bus,” which induces the supposition that the former was held a 
variety, the latter the typical form. The circumstance that the 
presence of an obsolete denticle has been recorded in the suc- 
ceeding species, whilst none has been attributed to the present, 
corroborates the idea; since precisely the same distinction 
