171 



is not complete, it will, from older or other specimens, be found to 

 be properly classed. 



Named in compliment to Robert MacAndrew, Esq., so well known 

 from bis valuable dredging operations. 



Genus II. Wilkinson^a, Chitty. 



§ I- 

 Shell subdiscoidal ; last whorl extraordinarily produced. Sculpture, 

 a few strong and many fine carince. 



WlLKINSON^EA WlLKINSON^ANA, Chitty. 



Hub. Yallahs Hill, East face. 



The symmetrical form and beautiful sculpture induce me to rank 

 it first. Is was also the second Stoastotna found, though not de- 

 scribed till long after S. Gouldianum, the latter in Sept. 1849 and 

 the former in Oct. 1850 ; for Adams at that time was inclined to 

 treat it as a mere variety ! Stoastotna Wilkinsonceanum, Ad. Cont. 

 Conch, p. 148 ; Cat. Phan. p. 233. 



WlLKINSONJEA GoULDIANA, Chitty. 



Hab. The backwoods in Manchester's highest mountains, north- 

 ern region. Stoastoma Gouldiana, Ad. See Mon. Stoast. Adams, 

 1849, p. 5 ; Cat. Phan. p. 232. 



Var. a. Ad. 

 Same habitat. 



Labrum not so much produced above. Aperture more cupped 

 and expanded in proportion. (See, as above.) 



Var. b. Chitty. 



Hab. Trelawny, still further north. 



Is much smaller than var. a., and labrum and aperture are mini- 

 ature of S. Gouldianum proper. 



Height 0-035, greatest breadth 0-073, least breadth 0-058. 



Wjlkinsonyea Schomburghkiana, Chitty. 



Hab. Moreland, Manchester. 



Form, subdiscoidal. Colour, semitransparent very pale horn. Sculp- 

 ture, lines of growth very apparent ; counting from the suture, there 

 are five less prominent and then one very prominent rounded spiral ca- 

 rina?, three less and one very prominent, two less and one very pro- 

 minent, two less and one prominent, three less and one very promi- 

 nent, and eight less, gradually becoming finer round the umbilicus : 

 visible on the upper whorls, three less, one prominent and two less. 

 Spire, much depressed, with considerably convex outlines. Whorls, 

 3f rds, well rounded but flattened at the lower part ; suture very 

 lightly impressed. Aperture, constricted at more than the width of 



