290 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 10, APRIL, I9OO. 



length by three-quarters in width. The best figure is that given in 

 " British Mollusca." 



The animal is far from sluggish, as stated by Clark. Mr. Stanley 

 Cox has found them crawling freely on the bare wet rocks in Babba- 

 combe Bay, far out of reach of sea-weeds. He also found that in 

 these specimens the animal was of a golden yellow colour, presenting 

 a beautiful object under the microscope, and differing from Clark's 

 description, in Avhich it is described as pale azure. These Babbacombe 

 specimens may probably be exceptional in their habits and food to 

 account for the disparity in colour. All the living specimens I have 

 taken have been from the small sea-weeds of rock-pools. 



There can be no reasonable doubt as to Walker's shell being this 

 species, which was said to have been found by him in shellsand 

 from Sandwich ; hence Montagu's name sandvicensis, and it is in my 

 opinion entitled to priority. Walker's use of the word " reticulatis," 

 and Clark's " quasi-reticulated," are slight errors which any one may 

 fall into on seeing certain specimens which give that impression, owing 

 to the striae being occasionally wavy or irregular, and these being 

 crossed by the lines of growth. Moreover, no other shell will repre- 

 sent Montagu's Turbo sandvicensis. 



O. decussata Mont. — Sandy and shelly ground, 10 to 45 fathoms. 

 Scilly Islands (Smart and others) ; Isle of Man, a single specimen 

 (Archer); Sound of Sleat 40 f., and Loch Boisdale 30 f. (Somerville 

 and J. T. M.) ; Jersey, Guernsey, and Herm ; Connemara, Mayo, 

 Sligo, and Groomsport ; Lismore 12 f. ; lona 16 f. ; Dornoch Frith ; 

 Thurso; the Minch 15 — 40 f. ; W. Orkneys 45 f. ; E. Shetlands 

 10 — 30 f. 



A local species, but rather plentiful in the Scillies and Shetlands. 

 The largest come from Guernsey, and are a line and three-quarters in 

 length, with four sculptured and two smooth whorls, besides the 

 nucleus. Usually there are only three sculptured whorls, but in fine 

 adult specimens there is a fourth. The apex is occasionally raised 

 obliquely, and the umbilicus or chink is unusually variable. A curious 

 incident of this species is that they are nearly all dredged dead, and 

 the majority of them pierced, especially those from the Shetland seas. 

 Jeffreys' figure has the last whorl disproportionate to the length of the 

 spire, which makes it look like an immature shell. 



O. clathrata Jeffr. — Birterbuy Bay 12 f. (Dodd) ! St. Andrew's 

 (M'Intosh). 



This very rare species has the nearest affinity to O. decussata, from 

 which it differs in being more slender throughout, with a longer spire, 

 a deeper suture, and coarser sculpture, which is usually continued to 

 the topmost whorls in British specimens. Though described as 



