200 HAWELL : GASTROPODA FROM THE UPPER LIAS OF YORKSHIRE. 
the suture tliey curve forwards so as to form an angle of about forty- 
five degrees with the carina at the shoulder ; this forward curving is 
continued until they reach the middle of the whorl when they bend 
backwards. The lines of growth are interrupted by the larger striw, 
but some of the stronger growth lines cross some of the secondary 
striations without interruption. Length four millimetres, width 
three millimetres. 
Four specimens were obtained, but none of them are in very 
satisfactory condition. The shells are pyritous. As they were 
discovered by Mrs. Kendall and communicated to me by Professor 
Kendall, who is doing so much for Yorkshire Geology, I propose 
for the species the name of Actasonina kendallii. 
Turbo saltviciensis, sp. no v. 
The other new Gastropod which I have to bring to your notice 
is a Turbo, of which the following is a description : — 
Shell a truncated cone with four evenly rounded whorls ; apex 
very obtuse, the primary whorl being almost discoidal ; suture 
moderately deep ; base slightly flattened ; umbilicus well pro- 
nounced, but shallow ; mouth nearly round, but rather pointed at 
the suture ; peristome not continuous ; outer lip very thin ; colum- 
ellar lip slightly reflected at the suture ; spiral strice very numerous, 
fine, and regular, crossed by the lines of growth, which are about 
equally close set, fine, and regular. Shell in its present condition 
very thin. Height one and a-half millimetres, width one millimetre. 
Some pieces of shale, obtained at Saltwick, are crowded with 
these little shells, of which I noticed at least one hundred and forty. 
They are pyritous, and exteriorly in excellent condition. The 
internal nacreous portion of the shell has, however, been dissolved, 
though it appears in some instances to give a whitish crystalline 
appearance to the internal cast when the shell is broken away, 
especially in the upper whorls. I propose for this species the name 
of Turbo saltviciensis, from Saltwick, the place where it was found. 
One specimen resembles the type, except that it has three ridges 
on the last whorl. This variety may be named tricarinata. 
