1016 PATELLA. 



Calyptraea equestris. Lamarck Syst. des Anim. p. 70. 

 La Cloche, on Sonnelte. Favanne, i. p. 556. t. 4. f. B4. 

 Lister Conch, t. 546. f. 38. Rumphius, t.40. f. P and Q. 

 Petiver Amb. 1. 16. f. 28. Gualter, t.9. f. Z. Argen- 

 tine, t. 2. f. K. Knorr, vi. t. 35. f. 5. 



Inhabits the coasts of Barbadoes. Lister. Amboyna. Rum- 

 phius. St. Domingo and the East Indies. Favanne. 



Shell about half or three-quarters of an inch in diameter, trans- 

 parent and white, or of a brownish white colour ; it is vari- 

 ously wrinkled, and delicately striated longitudinally, but the 

 striae are sometimes so minute as to be hardly discernible ; 

 the margin is irregularly sinuated. 



NEPTUNi. 2. Shell sub-orbicular, with longitudinal 

 strong elevated toothed striae, and the sum- 

 mit rather lateral. 



Le Bonnet de Neptune. Favanne, i. p. 555. t. 4. f. B 3. 

 D'Avila, t.2. f.B. Martini, i. p. 150. 1. 13. f, 117 and 

 118. 



Inhabits the coasts of St. Domingo. D'Avila. Falkland Isl- 

 ands. Favanne. 



This shell has been confounded with P. equestris, but it ap- 

 pears to me to be perfectly distinct, and I have followed 

 Martini in placing it as a separate species ; it is twice as 

 large and much less wrinkled, and may be at once distin- 

 guished by its longitudinal strongly toothed or spinous ribs, 



TECTUM. 3. Shell pyramidal, transversely foliace- 

 ous, and the summit central and erect. 



Patella Tectum Sinense. Chemnitz, x. p. 337. t. l68. 



f. 1630 and 1631. 

 Patella equestris, Var. /3. Gmelin, p. 3692. 

 Patella, No. 6. Schreibers Conch, i. p. 337. 

 Le Toit Chinois, ou la Molette. Favanne, i. p. 553. t. 4. 



f.B I. 

 Argenville, t.2. f. S. Knorr, v'l. t.35. f.4. Martini, u 



1. 13. f. 125 and 126. Humphreys Conch, t. 6. f. 9. 

 Inhabits the coasts of Batavia. Martini. China. Chemnitz. 

 Linnaeus, in his History of the Queen of Sweden's Museum, 

 and Favanne, as well as Gmelin, considered this to be a 

 Variety of P. equestris ; but, on the other hand, we have the 

 authorities of Martini, Chemnitz, and Schreibers, for regard- 

 ing it as a separate species. The size is generally consider- 

 ably smaller than that of P. equestris, and its traosverse 



