350 EMENDATIONS, 



Rissoa reticuldta, p. 50. For "shell ovato-turrite," read 

 " broadly ovato-conical. ' ' 



Itissoa tristridta. P. 58. 151. 



I am aware that this species is considered hy Dr. Johnston 

 and Mr. Thompson as identical with Rissoa semistriata, hut 

 the numerous specimens of the latter in my possession agree 

 in the characters assigned, and differ from those which seem 

 to me to represent the other species, in heing much more 

 broadly ovate, as well as in their colour-markings and strise. 

 They may however be all of one species. 



Odost6mia mterstincta. P. 155. 



By some accident, this species has been inaccurately de- 

 scribed. The following are its true characters : 



Shell oblongo-turrite, of five rather thick, transparent, 

 glossy, flattened, finely plicato-striate turns, the aper- 

 ture roundish-oval, nearly a third of the whole length, 

 with a very small plait. 



Shell oblongo-turrite, obtuse, rather thick, of five glossy 

 turns, which are distinctly separated, rather flat, finely plicato- 

 striate ; the aperture ovato-rotundate, nearly a third of the 

 whole length, with the incomplete peristome rather thick, the 

 pillar-lip not reflexed, but ending in a very small tooth-like 

 plait, and leaving exposed a narrow umbilical groove ; the 

 colour white. Length a twelfth of an inch, breadth a third 

 of the length. 



Found by me, in August, 1 842, in shell sand, between the 

 mouths of the Dee and the Don ; also in sand from Cruden 

 Bay, sent by Mr. Murray. 



Turbo interstinctus. Mont. Odostomia interstincta. Flem. 



For internally, read externally ; fourth line of generic cha- 

 racter of Em arginula. P. 177. 



For Cytheraa, read Cytherfa. Pp.211, 212, 262. 

 For denticulatusj read denticulata. P. 214. 



For Rimula Fleming'u, read Rimula Noachina. Pp. 65, 1 78. 

 So named, in allusion to the Deluge. Add Fisurella Noachina. 

 Lyell, Lamk. Syst. vii. 604. " Patella Noachina. Linn. Mant. 

 551." 



