SMITH : SOUTH AFRICAN MARINE SHELLS, WITH NEW SPECIES. 10/ 



7. Acmaea albonotata. (PI. I., figs. 14, 16). 



Testa pci?-va, irregulariter ob/ongo-ovaia, viediocriter coni'co-elafa, radia- 

 tiin ienuiter confertini liratula vel costulaia, costis lineis ijicrementi 

 coiispkne sculptis, extus soj'dide albida, indistinde griseo-radiata, 

 intus in medio rufo-fjisca, ad inarginem crenulaiu/n Jlavescens, maculis 

 alius et mfis notata ; cicat?ix pallida ; apex aci/tus, paulo antemedi- 

 aniis. Longit. 10 mm., diajii. 8, alt. 6. 

 Hab., Umkomaas, Natal (H. Burnup). 



A very small species, of a whitish tint, varied with indistinct greyish 

 rays, which are best seen by transmitted light towards the outer mar- 

 gin. The fine radiating liree vary in thickness, and are rendered some- 

 what scabrous by being crossed by the closely packed conspicuous 

 wavy lines of growth. The inner surface within the muscular impres- 

 sion is generally of a rich reddish brown colour, the scar itself being 

 frequently whitish and the border beyond yellowish spotted with white 

 and a few red dots, corresponding to the pale and darker rays which 

 ornament the shell. Most of the specimens examined when resting on 

 a flat surface touch only at the ends, arching slightly at the sides. 

 According to Professor Gwatkin, the radula is like that of Acvicza. 



8. Rissoia crawfordi. (PI. I., fig. 13). 



Testa piipceforjnis, solida, Levis, sordide grisea, supra purpiirascens ; 

 anfractiis 5, convexiusculi, sutura leviter obliqua sejuncti, ultimus 

 pone valde oblique descendens ; apertura obliqua, rottende ovata, 

 parva ; peristoma continuum, fortiter ijicrassatuin. Longit. 4^- ;/////., 

 diam., i^. Apertura cum perist. i longa. 

 Hab., Algoa Bay, 20 fath. (J. Crawford). 

 Remarkable for its pupoid form, solidity, smoothness, and the small 



aperture. 



9. Radius gracillimus. (PI. I., figs. 20, 21). 



Testa gracilis, utrinque attenuata, supra pallide carnea, infra jiava, 

 transversim tenuissime striata, lineisque incremefiti decussata ; ex- 

 tremitates callo coiispicuo stipra terminatce ; apertura undulata, 

 linearis, antice paulo latior ; labrum intus reflexum, flavum, extus 

 callo Into minute corrugato dilute car/ieo linea flava marginato in- 

 structum ; labium callo ffavo in medio crasso iiidutum. Longit. 

 31 7nm., diam. \\. 



Hab., from the stomach of a fish caught in 40 fathoms, ten miles 

 from Durban (Quekett). 



Remarkable for its very slender form, being even narrower than 

 R. philippinariim Sowb. or R. lanceolatus Sowb. It differs from the 

 latter in being more produced at both ends, and in being smoother. 

 The stride in lanceolatus are stronger and punctate, a feature not noticed 

 by the monographers. 



