334 MALACOZOA. GASTEROPODA. TECTIBRANCHIATA, 



pected it might prove something else, as I had formerly mis- 

 taken the half of a vertebra of a cartilaginous fish for a new 

 Fissurella. There is nothing else, however, I believe, that 

 closely resembles it, excepting the basal cup of " Balanus 



rngiosus," from which the presence of the animal, although 

 ivelled, distinguishes it. The species grows to a much 

 larger size, and varies in the form of the apex. 



Patella antiquata. Linn. Syst. Nat, i. 1259. Patella antiquata. 

 Mont. Test. Brit. 485. Capulus antiquatus. Flem, Brit. Anim. 

 364. 



ORDER VII. 

 GASTEROPODA TECTIBRANCHIATA. P. 67. 



FAMILY I. BULL^INA. P. 67. 



GENUS 2. BULLA. P. 68, 188. 



3. Bulla minuta. Minute Bulla. 



Shell ovato-cylindrical, truncato-mammillate, very 

 thin, transparent, glossy, with the aperture oblong, mo- 

 derately narrowed behind, the outer lip forming a 

 rounded projection there. Minutus, very small. 



Shell ovato-cylindrical, of two very thin, transparent, hya- 

 line-white, glossy turns, very faintly marked with growth- 

 lines ; the upper extremity broadly truncate, with a wide su- 

 ture-groove, and a central rounded mammilliform prominence, 

 which protrudes a little ; the aperture oblong, anteriorly wide 

 and rounded, moderately narrowed behind, extending the 

 whole length of the shell ; the outer lip projecting considerably 

 behind in the form of a small lobe ; the inner with a thin 

 lamina folded back so as sometimes to form a false umbilicus ; 

 the colour hyaline-white. The animal can withdraw itself 

 entirely within the shell. Length one-twelfth of an inch, 

 breadth a third less. 



Found by me alive, on Corallina officinalis, at the Cove, 

 four miles South of Aberdeen, on the 26th December, 1842 ; 

 also among shell sand from Ugie-mouth, and Cruden Bay, 

 collected by Mr. Alexander Murray. 



Diaphana minuta. Brown, Illustr. PI. 38. f. 7, 8. 



GENUS 4. BULLINA. P. 69, 190. 

 4. Bullina pellucida. Pellucid Bullina. 

 Shell subcylindrieal, thin, transparent, glossy, faintly 



