MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 151 



among corallines from rather deep water off Aberdeen ; 

 afterwards by Mr. Alexander Murray at Fraserburgh. 



Turbo reticulatus. Mont Test. Brit. 322. Suppl. PI. 21. f. 1. 

 Cingula reticulata. Flem. Brit. Anim. 306. Turbo subumbili- 

 catus quatuoranfractibus reticulatus apertura subrotunda. Walker, 

 Test Min. Rar. PI. 2. f. 32. 



9. Rissoa Pullus. Oval Banded Rissoa. 



Shell ovato-turrite, of five thin, semitransparent, glossy, 

 slightly convex turns ; the last about as long as the spire ; the 

 suture deep ; the aperture ovato-rotundate, rather acute be- 

 hind ; the outer lip scarcely thickened, the peristome complete, 

 a little reflexed on the left side, without umbilicus, but with a 

 small groove ; the colour yellowish-white, the last turn with a 

 band of oblique elongated red spots toward the upper margin, 

 and two bands of the same toward the end. " Operculum re- 

 markably strong, thick, testaceous, very convex, white and 

 smooth externally, the inner part a little concave, with a small 

 and singular spiral groove near one end." Mont. Length a 

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



It varies greatly in its markings, being pale red with dark 

 red lines, or deep red spotted with white. 



Among shell sand from Stonehaven, Aberdeen, and Cruden. 



Turbo pullus. Linn. Syst. Nat. 1233. Turbo pullus. Mont 

 Test. Brit, 319. Cingula pullus. Flem. Brit, Anim. 308. 



10. Rissoa tristridta. Tristriated Rissoa. 



Shell broadly ovato-conical, of five thin, glossy, semitrans- 

 parent, moderately convex turns, the last ventricose, and longer 

 than the spire, of which the outline is convex, and the tip ra- 

 ther obtuse ; the suture moderately impressed, but rendered 

 conspicuous by a narrow rim bordering the turns behind, and 

 accompanied by two smaller raised lines, and three striae ; the 

 colour hyaline-whitish, with three series of square or rhombic 

 red spots on the last turn ; the aperture large, roundish-ovate, 

 nearly half the entire length ; the peristome thin, incomplete 

 behind. Length a twelfth of an inch, or more. 



This beautiful species scarcely belongs to the genus Rissoa, 

 it not having the peristome complete. 



Several specimens found by me in shell sand, from the Bay 

 of Cruden, sent by Mr. Alexander Murray, in November, 

 1842. 



Rissoa tristriata. Thompson, Ann. of Nat. Hist. v. PI. 2. f. 10. 



