PLATE XVI. 



Fig. 



18. Rissoa obtusa. Brown. Cast, nearly thrice the natural size. Red Marls, Collyhurst, 



near Manchester. Mr. E. W. Binney's specimen. 



19, 20. Turbo Mancuniensis, Brown. Thrice the natural size ; testiferous. Tunstall Hill. 

 21, 22. Turbo helicinus, Srhlotheim. Thrice the natural size ; testiferous. Tunstall H. 

 23,24. Turbo Thomsonianus, JS^y. Thrice the natural size ; testiferous. Tunstall H. 

 25,26. Turbo Taylorianus, Xmy. Nearly twice the natural size; testiferous. Tunstall H. 

 27,28. Natica Leibnitziana, Z'my. Thrice the natural size ; testiferous. Tunstall H. 



29. Natica minima, Brown. Thrice the natural size ; cast. Red Marls, Collyhurst, 



near Manchester. Mr. E. W. Binney's specimen. 

 (This specimen served Captain Brown as the original of the 

 species.) 



30. Loxonema fasciata. King. Twice the natural size ; testiferous. Tunstall Hill. 



31. Loxonema Geinitziana, X2;?y. Twice the natural size ; testiferous. Humbleton Hill. 



32. 33. Macrocheilus symmetricus. King. A little more than twice the natural size ; 



testiferous. Tunstall Hill. 



