TURBO. 337 
engraving in Gualtier. The synonym of Lister (transferred in 
our author’s manuscript to the preceding species), though, in all 
probability, not designed for it, bears likewise a general resem- 
blance to the Linnean distortus. 
Gurbo crenellus. 
Neither Schréter nor Dillwyn have added any particulars to 
the original description of this hitherto unrecognised species, 
and Gmelin furnishes us merely with a slight transposition and 
abridgment of it. In this they acted wisely, for any attempt at 
identifying an object so very imperfectly defined (an inadequate 
description and no auxiliary synonym) must have been guess- 
work. Consequently, however interesting it may be to ascertain 
what our author intended, the name crenellus cannot be pre- 
served, since it was utterly impossible for any one to recognise 
the species by his publications. By a process of analysis, there 
being luckily but one shell in the entire collection of Linneus 
which coincides exactly with the diagnosis, the Solarium 
Chemnitzti of Kiener (Coq. Viv. Sol. pl. 4, f. 8) was found to 
have been the primitive type of the species. It is not sur- 
prising that no figure of it has been cited by Linneus, since 
the only one extant at that period was a not particularly 
excellent one by Lister, whose work, from the imperfection of 
his own copy, he was oftentimes compelled (as he has informed 
us) to quote from its observation by others. It must be re- 
~ marked, that in the description of T’urbo crenellus (as in that of 
T. argyrostomus and many other spirally-coiled univalves) the 
word longitudinal has not its modern signification of running 
from top to bottom or parallel to the axis, but running in 
whichever direction (length or breadth) the space between 
which is the greater. The meaning of the word consequently 
varies with the shape of the shell. 
Gurbo thermalis. 
As is usually the case with the smaller shells mentioned by 
Linneus, his immediate followers have been unable to identify 
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