xlii. CONCHYLIA— D/Ti^y/?^. 



4. subrufus, radiis subviginti Imvibus. 



with about 20 smooth rays. 



5. sinuosus, varid distortus, striis numerosis echinatis. 



variously distorted, with numerous prickly rays. 



6. glaber, striis transversim minutissimis. 



with very minute transverse striae. 



7. tumidus, glaberrimus, latere altero producto. 



quite smooth, jjroduced at one of the sides. 



** auriculis incequalibus. 

 with the auricles unequal. 



8. laevis, planatus, pellucidus, glaberrimus. 



flattish, transparent, and quite smooth. 



9. obsoletus, striis minutissimis longitudinalibus subundatis. 



with very minute longitudinal undulate striae. 



10. varius, radiis 28 echinatis. 



with about 28 prickly rays. 



11. Pusio, radiis 40, alternis minoribus. 



with about 40 rays which are alternately smaller. 



12. Lslandicus, radiis numerosis bifidis. 



with numerous doubled rays. 



47. Lima. 



1. bullata, convexu, striis subundatis intermediis minoribus. 

 convex, with somewhat undulate striae and 

 smaller ones between them. 



