398 Mr. E. A. Smith on Bossia Owenii. 



character and of a pale green tint, at times edged with white. 

 The base of the body-whorl exhibits indications of three or 

 four concentric narrow bands of a green colour, more or less 

 interrupted, and just beneath the suture there are some small, 

 subequidistant, dark spots also noticeable upon the preceding 

 volution. The upper whorls are strongly sulcated and ridged ; 

 but the sulci gradually disappear upon the lower half of the 

 penultimate whorl, being replaced by faint spiral striaa. 



The form of this species is very similar to that of T. mag- 

 nificus of Jonas, figured in Philippi's ' Abbildungen,' vol. ii. 

 pi. vi. (Trochus), and in his monograph of the genus Turbo, 

 in the second edition of the ' Conchylien-Cabinet,' pi. xiv. 

 figs. 1,2. 



T. cepoides is distinguished from that species by the pre- 

 sence of a deep perforation, difference of coloration, the pecu- 

 liarity of the lines of growth, its less conspicuous spiral stria?, 

 and the few narrow sulci revolving round the upper part of 

 the whor-ls. The lower columellar portion of the peristome 

 in T. magnificus is very much thickened by a stout callosity, 

 resting upon the base of the whorl and thinly spreading over 

 the surface to the upper extremity of the outer lip. 



In the present species the portion of the peritreme first 

 referred to stands out thin, not being reflexed upon the base, 

 the edge of it extending upwards into the narrow umbilicus, 

 and there is scarcely any callosity above the umbilicus. The 

 upper end of the outer lip in S. magnificus is peculiarly pro- 

 minent just beneath the suture, owing to the considerable 

 arcuation of the lines of increment ; and this is particularly 

 observable when the shell is viewed laterally. On the con- 

 trary, in T. cepoides this prominence is absent, the lines of 

 growth being scarcely curved at that particular part. 



Both species have an opaque limbus to the aperture, and 

 also a transverse callosity or ridge at the upper part of the 

 columella, extending within the shell subparallel with the 

 suture. 



Rossia Owenii, Ball. 



This appears to be a comparatively rare species ; hence a 

 record of its capture may be of interest. A mutilated speci- 

 men was picked up on the beach at Llandudno, North Wales, 

 after a storm, by Mr. Thomas Williams, a resident of that 

 town, Avho kindly sent it to the British Museum. This 

 species, which, according to Steenstrup [teste Gvvyn Jeffreys), 

 is the male of the Mediterranean R. macrosoma, Delle Chiaje, 

 was first discovered in Dublin Bay, but has since been 

 recorded from the English Channel and the North Sea. 



