24 ROCHESTER ACADEMY OF SCIENCE. [NoV. 23, 



Family OLIVIDi^. 



61. Oliva episcopalis, I^am. The specimens before me show a 

 great range of variation. 



62. Oliva irisans, T.am., var. erythrostoma. Lam., {=pondcr- 

 osa, Due.) 



63. Oliva irisans, Larii., var. tremulina, Lam. I have before me 

 two distinct varieties of this species ; one light, with the zigzag mark- 

 ings very distinct, and the other very dark, ahtiost black, so that the 

 markings are scarcely visible. 



64. Oliva sp. A distinct little shell, but one that I am unable 

 to determine by any of the monographs. It is about an inch in length, 

 of a cream color, with purple, zigzag, longitudinal lines. The 

 interior of the aperture is salmon-colored. The shell looks as though 

 it might be a young irisans var. erythrostoma. 



65. Ancilla (Anolacia) mauritiana, Sowb., (= torosa, 

 Meuschen.) A very common Mauritian species. 



Family HARPIDiE. 



66. Harpa minor, Lam. Quite abundant. 



Family MITRID^E. 



67. Mitra variegata. Reeve. 



68. " eximia, A Ad. 



69. " (Swainsonia) filum, Wood. 



70. " " fissurata. Lam. 



71. " (Cancilla) flammea, Quoy. 



72. " " interlirata, Reeve. 



I should hardly include this in the synonomy of flammea as 

 Tryon has done. The two shells seem, to me, to be quite distinct. 



73. Mitra (Cancilla) filaris, Linn. Very common and large. 

 There have been numerous varietal names attached to the various 

 forms of this species, but I cannot see any differential characters. 

 The species is indiscriminately long, short, thin or thick and I can 

 see no good lines of demarcation. 



74. Mitra (Chrysame) ferruginea, Lam. Quite abundant. 



