158 
This being a rarity in Scotland , the same part from 
whence the Rev. J. Fleming sent me the former, I was 
glad to gain for the science the information such a specimen 
affords. Of its being a Productus I believe there can be 
no doubt, and its similarity to Conch. (Anom.) productus 
of Martin, Tab. 22. F. 1. upper part, which I wish to 
call Productus Martini, makes me almost suspect it to be a 
variety of it; the spines, however, being more prominent 
and the hinge shorter, may prove it distinct; we must 
avail ourselves of these characters until our knowledge is 
ripened by experience, and we may hereafter show more 
perfect specimens . 
PRODUCTUS Scoticus. 
TAB. LXIX. — Fig. 3. 
Spec. Char. Semicircular, with fine longitudinal 
striae and a few obsolete spines, gibbous towards 
the beak ; sides expanded into the line of the 
hinge; hinge nearly twice the length of the shell. 
.The shallow valve has diverging striae, similar to those in 
the other, but without spinous punctures; it is concave, 
deepest in the two spaces between the middle and sides; 
the sides wrinkled towards the hinge. The striae on the 
convex valve are a little interrupted by obsolete spines or 
punctums, and sliort intervening striae. The lines of growth 
are fine and partial, causing irregular undulations, especially 
towards the sides; the middle slightly depressed. Nearly 
two inches wide. 
1 know this species from Scotland only, it was sent me 
by the Rev. J. Fleming. It is in dark coloured foetid 
Limestone, like most of the Derbyshire species, and it has 
crystallized Carbonate of Lime of a lightish colour within it. 
