GASTEROPODA. 9 



in the determination of the species. Since then I have obtained some better specimens, 

 and have here given an additional figure. 



This may possibly hereafter be referred to T.fuscata, Broc, which is said to be very 

 variable, but it differs considerably from the typical form of that species. The Crag shell 

 has a longer and more inflected canal, with a more obtuse apex, and the spiral band is 

 narrower and less distinctly marked, with the longitudinal lines less prominent. Speci- 

 mens oifascata from the Vienna and Bordeaux beds attain to the length of three inches 

 and upwards. The Crag shell seems somewhat to resemble a variety figured by Dr. Speyer, 

 ' Ober. Oligoc.,' &c, p. 13, tab. i, figs. 7, 8, a, b. M. Nyst considers it as a dextral 

 variety of T. inversa (Catal. in ' Bull, de l'Acad. Roy. des Sci., Lettr., et des Beaux Arts 

 de Belgique,' chap, xvii, p. 420). I have for the present retained my original name. 

 The shell referred to by Mr. Bell in ' Ann. and Mag. Nat. Hist.' for May, 1871, under 

 the name T. exilis, Bell, I have seen, and regard as a variety only of canalis. 



Columbella? Holbollii, Motter. Supplement, Tab. VI, fig. 21. 

 Fusus Holbollii, Moll. Ind. Moll. Groenl., p. 15 



" Testa fusiformi, elongata, alba, lavi, epidermide cornea, fusco-lutea, solidiore obtecta , 

 anfr. 9 sensim crescentibas, planulatis ; spira acuminata. Long. 2, 4"'/' — Moll. 



Locality. Upper Glacial, Bridlington. 



A specimen of this species is in the British Museum among the Bridlington fossils, and it 

 is enumerated by the late Dr. S. P. "Woodward in his list of Bridlington fossils in the 

 ' Geol. Mag./ vol. i, p. 53. This species is also found fossil in the Belfast deposit, where 

 I believe it is by no means uncommon. It is found living in the Spitzbergen and 

 Greenland seas. 



Columbella? sulcata, /. Soiverby. Crag Moll, vol. i, p. 23, Tab. II, fig. 2. 



Supplement, Tab. II, fig. 16. 



Localities. Cor. Crag, Sutton. Red Crag, Walton and Sutton. Fluvio-marine Crag, 

 Bramerton ? Middle Glacial, Hopton ? 



The figure in Supplement, Tab. II, represents a specimen found by G. Gibson, Esq., 

 of Saffron Walden, in the Red Crag at Walton-on-the-Naze. It is nearly double the size 

 of any specimen of this species previously obtained by myself. 



In the ' Crag Moll.,' vol. i, p. 23, the character given to this species is " apex acute." 

 This is an error, for although in some of the specimens the spire is much elevated and 

 elongately tapering, the apex is always more or less obtuse or mammillated. The species 

 of this genus from Turin and Astigiana are represented by Bellardi as being very acutely 

 pointed. This species has been obtained from the Coralline Crag by Mr. Bell, as well as 

 a fragment of it by myself. 

 2 



