MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 329 



Two specimens found by Miss Anne Macgillivray, in Decem- 

 ber, 1842, in sand from Stonehaven, procured by Mr. Alex. 

 Mitchell. 



Turbo trifasciatns. Adams, Linn. Tr. ii. PI. 1. f. 12 Turbo 

 cingillus. Mont. Test. Brit. 328. PI. 12. f. 7. Turbo graphicus. 

 Brown, Wern. Mem. ii. 521. PI. 24. f. 6. Cingula cingilla. Flem. 

 Brit. Anim. 309. 



17. Rissoa vitrea. Glassy Rissoa. 



Shell oval-oblong, subcylindrical, of four rounded, 

 thin, smooth, glossy, white turns ; the suture distinct ; 

 the aperture oval, narrowed behind. Vitreus, glassy. 



Shell oval-oblong, subcylindrical, of four thin, semitran spa- 

 rent, smooth, glossy turns, faintly marked with growth-lines, 

 convex ; with the suture deep, the apex rather obtuse ; the 

 last turn very oblique ; the aperture large, oval, narrowed be- 

 hind, with the outer lip rather thin, the inner reflexed, form- 

 ing a small cavity behind ; the colour white. Length a twelfth 

 and a-half of an inch, breadth a third of the length. 



Somewhat similar in form, as well as in the aperture, to Ris- 

 soa striata ; but less elongated, and destitute of spiral striae. 



Found by me among shell sand, from Ugie-mouth and 

 Cruden Bay, sent by Mr. Alexander Murray, in December, 

 1842. 



Turbo Titreus. Mont. Test. Brit. 321. PI. 12. f. 3. Cingula 

 vitrea. Flem. Brit. Anim. 309. 



FAMILY IV. TORNATELLINA. P. 58. 



GENUS 2. ODOSTOMIA. P. 58, 153. 



Odost6mia inscldpta. Engraved Odostomia. 



Shell oblongo-turrite, with five moderately convex, 

 pellucid, spirally striated turns ; the apex obtuse ; the 

 aperture oval, with a small plait on the columella. In- 

 sculptus, engraved. 



Shell oblong, tapering to an obtuse apex, with five or six 

 moderately convex, thin, pellucid, spirally striated turns ; the 

 suture distinct ; the aperture ovate, acute behind, nearly half 

 the entire length, the inner lip a little reflexed, and ending in 

 a small plait ; the colour white. Length nearly a twelfth of 

 an inch, breadth nearly half the length. 



