118 



Pecten asperrimus 



senatorius 



aurantius 



florens 



varius 



sanguineus 



sinuosus 



ornatus 



Pecten pellucid us 



Tranquebaricus 



gibbus 



miniaceus 



pusio 



hybridus 



• sulphureus 



lividus 



Pecten hexactes. 

 [And twenty-seven fossil species.] 



PL1CATULA. 



SPONDYLUS PLICATUS. LinUCBUS. 



Sowerbys Genera, No. S, pi. 4. 

 The G. Plicatula has been separated from the G. Spon- 

 dylus of Linnaeus, which it somewhat resembles in ge- 

 neral appearance, but on examination proves to be quite 

 distinct in its structure. The ligament is altogether 

 internal, as in the Pecten ; it has the primary teeth of the 

 Spondylus, but without the ears or the prolonged beak, 

 which are very conspicuous in that genus. The Plica- 

 tulae also possess the faculty of affixing themselves to 

 one another, or various marine bodies, grouped together 



