KUNGL. SV. VET. AK AD EMIENS HANDLING AB. BAND 41. N:0 4. 



S9 



Spinalis Eydoux & Souleyet 1840. 



1. Whorls 9—10, spirally striated, the last = V 5 of the length of the shell. Body 

 purplish, shell hyaline of about 5 mm. in length 



S. balea (Möller 1841) = Gouldi Stimpson 1851. 



2. Whorls 6—7, spiral sculpture indistinct; spire less elevated than in the preceding 

 species; the last whorl = V:, of the length of the shell. Colour as in the preced- 

 ing species. L. of the shell about 3 mm. 



S. retroversus (Fleming 1823) = Flemingii Forbes 1848. 



Fam. Cavoliniidae. 



1. Shell calcareous, rhomboidal, with lateral keels, broadest at the aperture; lateral 

 slits absent Clio Browne. 



2. Shell mostly corneous, with a lateral slit on each side, through which the mantle is deflected over the shell 



Cavolinia Abilduaarp 



Clio Browne 1756. 

 Cleodora Peron & Lesuettr 1810. 



Shell triangular, convex above, slightly concave below; on the upper side with 

 5 ridges, on the under side with one. Colour of the shell glassy white; the mantle of 

 the animal has a metallic lustre. L. 15 mm. C. pyramidata Browne 1756. 



Cavolinia Abildgaard 1791. 

 Diacria Gray 1842. 



Shell sub-triangular with one posterior and two lateral spines, without stria' hut with 5 keels on the 

 upper surface. Mantle without produced appendages. L. 10 mm. C. trispinosa (Lesueuk 1821). 



Fam. Clionidae. 



Clioiie Pallas 1780. 



Wings ovate-triangular, nearly as long as the breadth of the body. Colour 

 rosy towards back, in other parts bluish hyaline. Radula 8.1.8 (G. O. Sars 1878) 

 or 12.1.12 (Loven 1847). L. about 35 mm. 



C. limacina (Phipps 1774) = Clio borealis Bruguiere 1792. 



