MALAC0Z0A. GASTEROPODA. PECTINIBRANCHIATA. 329 



Two specimens found by Miss Anne Macgillivray, in Decem- 

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

 Mitchell. 



Turbo trifasciatus. 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. Fitreus, glassy. 



Shell oval-oblong, subcylindrical, of four thin, semitranspa- 

 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 vitreus. Mont. Test. Brit. 321. PI. 12. f. 3.— Cingula 

 vitrea. Flem. Brit. Anim. 309. 



Family IV. — Torxatellina. P. 58. 



Gexus 2. Odostomia. P. 58, 153. 



Odostdmia inscidpta. 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. 



9 v 9 



/V ill IV 



