CONCHOLOGY. 153 



C. pyrum. C. semigranosa. 



C. Ceylanica. C. vibex. 



C. erinaceus. 



C. tuherosa. The tuberous Cassis. PI. 28, fig. 5. 

 Species in which the aperture is long, the external edge 

 almost straight, and the spire with thickened bands. 



C.jiammea. The flaming Cassis. 



Species in which the aperture is sub-oval, and the exter- 

 nal edge excavated ; spire short, base triangular ; columella 

 rugose ; outer lip thickened. 



C areola. The draught-board Cassis. 



Smooth, shiny, white, with square orange tesselated spots ; 

 spire short and conical, with decussated striae ; lower part 

 of columella rugose. 



3. Ricinula. Nine species. 



Shell oval or sub-globular, thick, armed with points or 

 tubercles, with a depressed spire ; aperture narrow, elon- 

 gated, notched, sometimes canaliculated anteriorly, and digi- 

 tated externally ; the left edge more or less callous, some- 

 times denticulated ; operculum horny, oval, transverse, with 

 elements slightly imbricated. 



Ricinula horrida. Ricinula digitata. 



R. clathrata. R. pisolina. 



R. arachnoidea. R. aspera. 



R. miticula. R. morus. 



R. mutica. 



R. horrida. The horrid Ricinula. PI. 26, fig. 2. 



Species without a canal ; exterior covered with strong, 

 obtuse black tubercles, with the interstices white, striated 

 transversely ; interior rich purple colour ; outer lip with five 

 triangular grooved radii, between which at their base the 

 margin is crenulated. 



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