334 MALACOZO^ GASTEROPODA. TECTIBRANCHIATA. 



pected it mk t prove something else, as 1 had formerly mis- 

 taken t]ie 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 

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

 shrivelled, distingui&hes it. The species grows to a much 

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



Patella antiquata, Linn. Syst. Nat. i. 12o9. — Patella antiquata. 

 Mont. Test. Brit, 485. — Capnlus antiquata s. Flem. Brit. Anim. 

 364. 



ORDER VII. 

 GASTEROPODA TECTIBRANCHIATA. P. 67. 



Family I. — Bulljeina. P. 67. 



Genus 2. Bulla. P. 68, 188. 



3. Bfdla 7ninuta. Minute Bulla. 



Shell ovato-cylindrical, truncato-mamniillate, very 

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

 derately narrowed behind, the outer hp forming a 

 rounded projection there. Mimitus, 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 thu'd less. 



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

 four miles South of Aberdeen, on the 2Gth December, 1842 ; 

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

 collected by Mr. Alexander Murray. 



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



Genus 4. Bullina. P. G9, 190. 

 4. Bullina pellucida. Pellucid Bullina. 

 Shell subcylin^rieal, thin, transparent, glossy, faintly 



