GASTEROPODA. 29 



the length of the shell being hardly twice its breadth j while in mediglacialis it is very 

 nearly three times. It also differs from all the specimens of mediglacialis 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 ceispus, Borson (fide Mich.). Oritt. Piemont., p. 317, No. 17. 

 — — Michelotti. Desc. des Foss. Mioc. de l'ltal., September, p. 272, t. ix, 



figs. 17, 18. 



Spec. Char. "F. Testa elongato-fusoidea, solida ; anfractibus convexis, longitudinaliter 

 costatis ; costis crassis, rotundatis, transversim plicatis, plicis super costas lamellosis, in 

 inter stitiis jiliformibus, apertura subovata, canali elongatiusculo, aperto. cylindraceo ; labro 

 intusprofunde sulcato ; columella laevigata." — 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 abrasus, tS. Wood. Supplement, Tab. II, 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. rugosus 

 orF. cos tiferus, 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 (T. imperspicuum). Crag Moll., vol. i, p. 50, Tab. VI, fig. 12. 



The late Dr. S. P. Woodward {in Lit.) suggested this might be F. latericeus. I 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. 



