PLATE XVIII. 



PAGE 



Fig. 31. Typhis antiquus. Magnified. 82 



Fig. 32. Fusus Martinez. Natural size. 82 



Fig, 33. F. Mathewsonii. Natural size. 83 



Fig. 31. F. Averillii. Magnified. 83 



Fig. 35. F. Diaboli. Magnified. 84 



Fig. 3(>_ F. (Heinifusus) Remondii. Natural size. 87 

 Magnified view of surface. 



Fig. 37. Neptunea curvirostris. Magnified. 88 



Fig. 38. N. ponderosa. Natural size. 88 



Fig. 39. N. perforata. Magnified. 81 



Fig. 40. N. supraplicata. Magnified. 89 



Fig, 41. N. Hofemannii. Natural size. 90 



Fig. 42. N. gracilis^ Magnified. 90 



Fig. 43. Perissolax urevirostris. Natural size. 90 



Fig. 44. Tritonium Diegoensis. Magnified. 95 



Fig. 4(i. Turris Claytonen.sis. Magnified. 92 



Fig. 47. T. (Drillia) varicostata. Magnified. 93 



Fig. 48. Pugnellus hamulus. Young. Natural size. 124 



Fig. 49. Nassa cretacea. Magnified. 97 



Fig. 50. N. ANTiyuATA. Magnified. 97 



Fig. 51. Haybenia impressa. Natural size. 98 



a. Toj) view. 



Fig. 52. Pseodoliva uneata. Natural size. 99 



Fig. 53. Olivella Mathewsonii. Magnified. 100 



Fig. 54. Ancillaria elongata. Magnified. 100 



Fig. 55. V Fasciolaria l;eviuscula. Natural size. 100 



