128 CONCHOLOGY. 



H. canaliculata. The channelled Haliotis, 

 Species with disk elevated by a large parallel rib, hollowed 

 interiorly, and with the anterior margin more or less irregular. 



H. tuherculata. The tuberculated Haliotis, 

 Aperture open the whole length of the shell ; outer lip ir- 

 regular, exterior reddish brown, striated longitudinally and 

 wrinkled transversely, with a few raised tubercles ; interior 

 pearly, reflecting the most beautiful shades of pink, blue,- 

 green, and yellow. 



FAMILY XIII. 



Plicacea. Two genera. 

 1. Tornatella. Six species. 



Shell thick, oval, convolute, the spire very short ; the last 

 whorl much larger than all the others united ; the external 

 thin, sharp, dentated interiorly ; one or two large plaits on the 

 columella, of which one serves to separate the two parts of 

 the foot. 



Tornatella fiammea. Tornatella auricula. 



T. solidula. T. nitidula. 



T. fasciata. T. pedipes. 



T. fasciata. The banded Tornatella. 



Spire produced, apex acute, aperture straightened, with one 

 plait on the columella ; finely striated transversely, with two 

 white transverse bands ; colour purphsh red. 



T. coniformis. The cone-shaped Tornatella. PI, 22, 

 fig. 3. 



Species like a cone ; the spire entirely fiat. 



2. Pyramidella. Five species. 

 Shell smooth, not covered with epidermis, conical, elon- 

 gated or sub-turriculated ; aperture semi-oval, entire ; the 

 outer lip sharp, dentated interiorly, plaited, enlarged over the 

 umbilicus, which it leaves more or less exposed. 



