APPENDIX TO SECTION IV. 



Since the above species were described, a few additional ones 

 have been received, which are described below, together with one 

 or two which had been overlooked before. 



FICUS, Rousseau. 



F. MAMILLATUS, n. S. 

 « PI. 32, Fig. 276. 



Shell moderate in size, thin, rounded; spire low; whorls five, 

 rapidly increasing in size, the first one smooth and rather promi- 

 nent, presenting a mamillated appearance ; suture distinct. Sur- 

 face marked by numerous small, sharp, revolving ribs, crossed 

 by finer longitudinal lines. Columellar lip sinuous, cmarginate 

 above, convex below ; outer lip simple. 



.Figure, drawn from a smaller specimen to the scale of the largest fragment. 



Locality: Near Fort Tej on ; Dr. Horn. 



This beautiful species resembles, in its sculpture, Fusus (Hcmifusus) Rimondii, 

 found at the same locality ; but the shell can be at once distinguished by its more 

 convex whorls and shorter spire. There is a difference also in the sculpture ; the 

 revolving ribs in this species are larger than the longitudinal ones ; while in the 

 other species both sets are nearly of the same size. 



(211) 



