102 DESCRIPTION OF SHELLS FOUND 



" This variety of Turbo neritoides, Lin., having a spire a little more 

 pointed than that of our coasts, is common in all the seas of the North, 

 in Sweden, Norway, and Denmark, and I believe it is also found 

 fossil." — Desliayes. Mr Lyell informs me that it is a common recent 

 shell in the St Lawrence. — S. 



Found at Dalmuir, by Mr Smith. 



5. RISSOA FALLAX. N. S. — Smith. 

 Plate I. Fig. 7, 8. 



Shell with six gradually tapering volutions, flat on their sides, se- 

 parated by a slight suture, and terminating in a somewhat obtuse 

 apex ; the whole shell ornamented with fine spiral stria?, which is 

 not observable without the aid of a strong lens ; body somewhat de- 

 pressed beneath, where the stria? are considerably stronger than 

 above ; aperture obliquely subovate ; outer lip plain ; pillar-lip 

 but slightly reflected on the columella, becoming wider and smooth 

 as it descends towards the base ; length somewhat more than an 

 eighth of an inch ; breadth two-thirds its length. — B. 



Found at Port Rush, county of Antrim, by Mr Smith. 



0. TROCHUS INFLATUS. N. S. — Smith. 

 Plate I. Fig. 10, 11. 



Shell subconic, with five tumid, considerably inflated volutions, 

 deeply defined by the suture ; base provided with a pretty large and 

 deep umbilicus ; aperture a little quadrangular, pearly within ; the 

 whole shell covered with long, spiral stria?, with intermediate smaller 

 ones, crossed by extremely minute, nearly obsolete intermediate 

 stria? ; on the top of each volution adjoining the suture are placed a 

 series of indistinct tubercles ; length nearly three-eighths of an inch ; 

 breadth the same. 



This species may easily be mistaken for Trochus tumidus, but the 

 volutions are rounded, whereas in the tumidus, the sides are some- 

 what compressed, and the body provided with a subcarination at the 

 base. — B. 



Discovered at Dalmuir by Mr Smith. 



7. VELUTINA UNDATA. N. S. — Smith. 



Plate I. Fig. 15. 



Shell with three volutions ; spiral exceedingly small, placed late- 

 rally, and sunk behind the expansion of the outer lip ; apex de- 

 pressed ; the whole shell covered with strong longitudinal undulated 



