THE RADULA OF THE VOLUTID.^'. 

 By the Eev. Dr. A. H. Cooke. 



Read 11th November, 1921. 

 The radula in each of the following species of Volutidse is known, 

 either by description, or figure, or by both ; — 

 Cymhium papillatum, Schum. (= olla, auctt., nee L.). Loven (16), 



Troschel (27), Hogg (U), Schacko (21). 

 Melo diadema, L. Cooke (1). 

 „ indicus, Gmel. Fleure (9). 

 „ ncmticus, L. Troschel (27). 

 ,, sp. Macdonald (17). 

 Valuta ancilla, Sol. Woodward (29), Pace (18). 

 anomala, Marts. Thiele (25). 

 arahica, Mart. (= pacifica, Lam.). Hutton (15). 

 concinna, Brod. Schacko (21). 

 dohrni, Sowb. Dall (5). 

 duhia, Brod. Dall (2, 5). 

 gouldiana, Dall. Dall (2). 

 junonia, Hwas. Dall (5). 

 mamilla, Gray. Gatliff and Gabriel (10). 

 musica, L. Fischer (8), Pace (18). 

 philippiana, Dall. Dall (4, 5). 

 pyrrhostoma, Wats. Sowerby (24), Thiele (25). 

 roadknightcB, McCoy. Verco (28). 

 smpha, Gmel. Troschel (27), Dall (2). 

 sparta,Ddll. Dall (5). 

 stearnsii, Dall. Dall (2, 5). 

 vanhoeffeni, Thiele. Thiele (26). 

 vespertilio, L. Troschel (27), Pace (18). 

 Lyria delieiosa, Montr. Fischer (7). 



,, nucletis, Lam. Pace (18). 

 Amoria undxdata, Lam. (= turneri, Gray). Gray (13), Troschel (27), 



Pace (18). 

 Volutilithes ahyssicola, Ad. & Eeeve. Sowerby (23), Woodward (29), 



Dall (4), Thiele (24). 

 Neptuneopsis gilchristi, Sowb. Sowerby (22), Thiele (24), Wood- 

 ward (29), Pace (18). 

 Volutomitra groenlandica, Beck. Troscbel (27), Sars (20), Dall (2), 



Pace (18). 

 Halia priamus, Meusch. Fischer (6), Poirier (19), Dall (3). 



In all, thirty species, of which four, viz. dohrni, duhia, goiddiana, 

 and junonia have lost the radula altogether.^ 



^ An operculum is known to exist in V. africana, anomala, musica, stearnsii 

 (probably), Lyria deliciosa, Nept. gilchristi. Fischer (Manuel, p. 610) seems 

 to imply that all species of Lyria are operculate. 



