inhabiting the seas of Gi-eat Britain and Ireland. 347 



Chemnitzia similis, Wood, Cr. Moll, part 1. p. 84. tab. 9. fig. 11 

 «-c? 



Portmarnock near Dublin, Miss M. Ball (Thomps.). Northum- 

 berland coast (Alder). Oxwich Bay near Swansea in fifteen fathoms 

 water; Fishguard in eight fathoms ; Dublin Bay; Dealvoe, Zetland. 

 Loch Fyne ; Oban; Birtabuy Bay, co. Galway (Mr. Barlee). 



Var. a. minor, angustior; costse plus numerosse et obliqui- 

 ores. 



Zetland, five miles east of Lerwick, in forty fathoms water. Ban- 

 try Bay (Mr. J. D. Humphreys). Oban ; Loch Fyne (Mr. Barlee). 



Var. b. multo minor et gracilior. 

 South of Devon (Mrs. Richard Smith). 



A local species. 



Most probably the Turbo simillimus of Montagu; but that 

 author did not notice in his description the transverse striae. Nor 

 has Philippi described the rufous band which encircles each whorl 

 at its base, although in every other respect the species agrees 

 with his description of rufa. The Odostomia simillima of Wood, 

 who refers it to the Turbo simillimus of Montagu, is a very dif- 

 ferent shell. 



Under a powerful magnifier some indistinct longitudinal strise 

 are observable in the interstices of the ribs. 



27. Odostomia formosa. 



Testa elongata, gracilissima, solidula, alba, 20 longitudina- 

 libus subrectis angustis et prominulis costis instructa, cujusque 

 anfractus sutura interruptis, et transversim interstitiis striata ; 

 costae subtus profunde punctatse, striae interstitiales curvse sub 

 lente lineas confertas efFormantes, diameter cujusque costse et 

 spatii interstitialis fere sequalis ; basis transversim striatus ; an- 

 fractus 14, convexiusculi, superne turriculati ; sutura subobliqua, 

 profundissima et distincta ; apex acutissimus ; apertura ovato- 

 quadrata et in superiore parte columellse plica indistincta et ob- 

 liqua instructa ; labium columellare rectum. Long, y'^, lat. J^ 

 unc. 



Oxwich Bay near Swansea. Shellness, Kent (Mr. G. B. Sowerby). 

 Bantry Bay (Mr. MacAndrew). 



Very rare. 



This most elegant species is easily distinguishable from either 

 of the slender varieties of rufa by the colour, much more slender 

 and tapering form, the whorls being turricuiate and suture rather 

 oblique, the peculiar character of the interstitial transverse striae, 

 and by the more elongated and subquadrate form of the aperture. 



24* 



