SYKES : ON THE GENUS ACAVUS. 115 



3. Acavtts fastosus (Albers). Also closely allied to A. heemastomus, 

 but smaller, with the bands far more numerous. 



4. Acavtjs phcenix (Pfeiffer). Here, again, the colour of the lip 

 varies greatly, the most common colour being black, but forms with 

 white and rose-pink lips are found. As a rule, the darker the shell 

 the blacker the lip, and vice versa. 



5. Acavus superbus (Pfeiffer). As usual, the three colour variations 

 of the lip occur : white, edged with orange brown (typical) ; black 

 (If. Grevillei, Pfr.) ; rich deep rose (var. roseolabiata, Nevill). The 

 last is a remarkable variety, and indeed may prove to be distinct. 



6. Acavus (Oligospira) Waltoni (lleeve). Specimens show con- 

 siderable variation in size, those in my collection (adult) measuring 

 from 46 to 56 mm. The lip varies from brown to black. I think that 

 A. Poleii, Collett, is only a white-lipped variety. 



7. Acavus (Oligospira) Skinneri (lleeve). Quite distinct. 



