11 
Untonella Carxei, S[). nov. 
ri. .1, Fig. 20; ri. ir, Figs. r)-7. 
Sp. Char. — kSholi (luadran^ulai’-oblong, lonii^or tlian thick, ]>ro- 
(liiccd ])ostci‘iorly. Cardinal mai’gin Ion", erect, and straight, Init not as long* 
as the shell ; ligament small, short. Ventral margin straight. Anterior end 
small, the margin rounded; ])osterior end produced, somewhat ohliqnely 
truncated, and slightly produced ventrally. Umhonal region and hody of the 
sliell towards the ])osterior hroad and gil)hons ; nmhoncs depressed and rather 
in curved, iisnally very much eroded, placed at about one-fonrth from the 
anterior end ; diagonal ridge very prominent and strongly marked. Sharp 
towards the nmbones ; posterior slope Avide and flattened, or inclined to the 
concave, Ijecoming straight-Avalled under the (O’ect cardinal margin. Anterior 
adductor im})rcssion elongately triangular, strongly marked ; posterior 
impression on the diagonal ridge ; \imhonal scars similar to those of tlie last 
species, and very strongly marked. Ornament consisting of A'cry fine regular 
lines, Avith distant laminm of groAvth, but the former sharj)ly sinuous, or 
deflected in the region of the anterior adductor. 
Ohs. — Tlie quadrangular outline, erect and straight hinge line, and 
very marked diagonal ridge are characters not met Avith in the preceding 
species. 
A peculiar inflection of the fine ornamenting lines of the surface is 
ohservable in JJ. Cornel. In front of the pronounced anterior cardinal 
nmscnlar scars, the strong ridge separating the latter from the body of the 
shell is re})rosented outwardly by a slight de2)ression of the surface or sinus. 
In ])assing over this, the fine linear ornament is Avaved or inflected, and 
becomes a^ veiy important feature of this s})ecies. Sometimes it is very 
marked, at others faint, but invariably jn-csent in one form or the other. 
I liaA'c much pleasure in associating Avith this the name of Mr. Jose])h 
Ik Came, Curator of the Geological and Mining Museum of this department. 
Loco-llli). — llaiiAAuy Cutting, near Gibraltar Tunnel, lioAAral, Co. 
Camden. 
Ilorkou. — Ironstone l)ands in the IVianamatta Slialc. 
Collector. — Mr. B. Dunstan. 
