GASTEROPODA. 29 
the length of the shell bemg hardly twice its breadth; while in mediglacialis it is very 
nearly three times. It also differs from all the specimens of mediglacialts in the spiral 
striation, which is equally distributed over the whorls. I have never seen any but full- 
grown forms or nearly so of Purpura tetragona, and it is not impossible that the shell in 
question may be the young of that species. In this uncertainty I have provisionally 
given it the above name. 
Fusus crispus ? Borson. Supplement, Tab. 11, fig. 10. 
Fusus crispus, Borson (fide Mich.). Oritt. Piemont., p. 317, No. 17. 
— —  Michelotti. Desc. des Foss. Mioc. de l’Ital., September, p. 272, t. ix, 
figs. 17, 18. 
Spee. Char. “F. Testa elongato-fusordea, solida ; anfractibus convexis, longitudinaliter 
costatis ; costis crassis, rotundatis, transversim plicatis, plicis super costas lamellosis, in 
interstitis filiformibus, apertura subovata, canali elongatiusculo, aperto, cylindraceo ; labro 
intus profunde sulcato ; columella levigata.” —Mich. 
Locality. Red Crag, Sutton. 
The specimen figured was obtained by Mr. Whincopp from the workmen at the 
nodule excavations in the Red Crag, and he has kindly permitted me to figure it, and 
though much worn it retains some of the outer coating with its ornaments. I have also 
obtained from the Red Crag at Sutton a specimen which appears to belong to the same 
species, but in a more worn condition. ‘This is probably a derived species. 
Fusus asrasus, 8S. Wood. Supplement, Tab. LI, fig. 8. 
Locality. Red Crag, near Woodbridge. 
This represents another specimen from the collection of Mr. Whincopp. It appears 
to be a fossil extraneous to the Red Crag, and it has been much altered, and the outer 
coating apparently removed. It has somewhat the form and ornaments of F. ragosus 
or F. cosfiferus, but the ribs incline too much to the right, and it is too elongated. It is a 
very much abraded shell, and as I am unable to refer it to any species known to myself, 
I have given to it provisionally the above name. 
Fusus imperspicuus (Z" imperspicuum). Crag Moll., vol. i, p. 50, Tab. VI, fig. 12. 
The late Dr. S. P. Woodward (iz Lit.) suggested this might be F latericeus. 1 have 
carefully again compared my shell with that species, and I think they are specifically 
different. I have given another view of the Crag shell, showing the opening, Supplement, 
Tab. II, fig. 4. 
