The Hon. E. Chitty on the Stoastomiclae. 73 



and rounded off, smooth, plain, not scolloped. Labium, straight, 

 edge produced angularly in its centre, and much rounded and re- 

 flected towards the umbilicus. Lahral lamella (see ante), rises 

 somewhat abruptly from the labrum, forming a cavity longer in its 

 interior than the aperture, and joins the last whorl below, beyond 

 the umbilicus, by rather a sharp inflection upwards ; so that from 

 its junction to outside the labium is not wider than the lesser dia- 

 meter of the aperture ; exteriorly very convex, with a deep suture 

 between it and the last whorl beneath. Umbilicus, concealed. Oper- 

 culum, ? 



Height 0-0.57, greatest breadth 0*083, least breadth 0*07. 



Named in compliment to S. P. Woodward, Esq., British Museum, 

 author of * Manual of Recent and Fossil Shells,' &c. 



Lewisia MacAndrewiana, Chitty (unique). 



Hab. Near the Botanic Garden, St. Andrew's. The smallest 

 Stoastoma ! 



Form^ subdiscoidal. Colour, pearl white, semitransparent, most 

 hkely therefore a young shell. Sculpture, 25 equidistant fine spiral 

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

 3^, well rounded, with rather a deep suture ; last whorl well rounded. 

 Aperture, well rounded, more than a semicircle, very slightly ex- 

 panded below ; a little detached from penult whorl and very slightly 

 depressed. Labrum, slightly double, thin, reflected very shortly, 

 white, shining, smooth, planular. Labium, well detached from 

 penult whorl, rather lower than plane of labrum, very shghtly curved 

 to the right below. Umbilicus, N.B. ! apparently very shallow, but 

 covered by an externally convex white callosity, which proceeds from 

 behind the upper end of the labium and covers the umbilicus, and 

 is attached to the body-w^horl all but at its extreme left ; whereunto 

 it may, in older specimens, be entirely soldered. This, though in- 

 complete at the aperture, bears the characters of a complete shell. 

 The labral lamella is very slightly produced, rounded at its edge, 

 quite separate from the above callosity on the right, but apparently 

 joining the exterior of it on the left, round the umbilical region. 



Height 0-024, greatest breadth 0*046, least breadth 0-03(j. 



I have some doubts as to placing this unique specimen in this 

 subgenus, but think that, from the callosity over the umbilicus and 

 its seeming immaturity, and the appearance that the labral lamella 

 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 his valuable dredging operations. 



Genus II. Wilkinson^a, Chitty. 



§ I. Shellsubdiscoidal;last whorl extraordinarily produced. Sculp- 

 ture, a few strong and many fine carince. 



WlLKINSON^A WlLKINSON^ANA, Chitty. 



Hab. Yallahs Hill, East face. 



The symmetrical form and beautiful sculpture induce me to rank 



