120 HALIOTIS. 



surface covered with spiral cords and threads, and having numerous 

 folds radiating from the suture. Perforations 5, oval, not raised. 



The shell is nearly circular, very convex, the spire decidedly ele- 

 vated, formed of about three rounded whorls ; the last whorl has a 

 blunt keel at the row of holes, and a narrower, more acute carina a 

 short distance below it, the space between being a little concave. 

 The entire surface has close spiral cords and threads which are 

 sometimes somewhat granose, and there are numerous folds radiat- 

 ing from the suture, but not long enough to reach the periphery. 



The coloration consists of broad radiating patches or oblique 

 stripes of chestnut-brown, green and flesh-color or whitish. Inside 

 it is silvery with red and green reflections ; muscle-impression not 

 distinct. Columellar plate flat, not truncate below, strongly slop- 

 ing inward. Perforations generally 5, oval, their edges only a trifle 

 raised. Length 68, width 56, convexity 26 mill. 



Australia. 



H. excavata Lamarck, An. s. Vert, vi, p. 215. — Reeve Conch. 

 Icon., f. 25. — Sow t erby, Thes. Conch, v, t. 3, f. 21 , 26. — Weinkauff, 

 Conchyl. Cab., p. 39, t. 16, f. 1, 2. 



The elevated spiral tendency is stronger in this species than in 

 other Haliotis. It is possibly more nearly allied to the little H. 

 pulcherrima than to other species. 



Section Padollus Montfort, 1810. 



Scarcely separable from the ncevosa group of Haliotis being con- 

 nected by numerous intermediate species. It is convenient, how- 

 ever, to recognize the small rounded species by this term. Australia 

 is the center of distribution ; but a species is found on the South 

 African coast, one off the Galapagos (singularly close in characters 

 to the S. African), and H. ovina is reported from as far north as 

 China. 



They fall into four groups ; see synopsis antea, page 78. 



Group of H. parva. 



Spirally striated ; no radiating lamella? between the spire and the 

 inner spiral rib, parva; pourtalesii. 



Spirally striated ; having raised lamella? between spire and the 

 inner spiral rib, emmce ; tricostalis. 



H. parva Linne. PI. 14, fig. 74. 



Shell rather small, oval, depressed, having a strong rounded rib 

 on the upper surface parallel with the row of holes; the surface all 



