32 EXOTIC CONCHOLOGY. 



APPENDIX. 



Containing Mr. Swainson's Descriptions of the unfigured Shells of the First Edition, 

 together with those described by him in Bligh's Catalogue. 



PTEROCERA NODOSA. PURPLE-MOUTHED SCORPION. 



P. Testae labio exteriore processibus 6 tuberculatis compressis armato ; margiae dentato ; 



apertura intus purpurea, costis albis striata, ad marginem aurantiaca. 

 Outer lip with six tuberculated compressed processes ; the margin toothed ; aperture 



within, purple striated with white ribs, and margined with orange. 

 Strombus Scorpius, Gmelin, 3508. 4. Seba, tab. 82. 11. 15. 

 P. Nodosa, Brug. Ency. Meth. pi 410. 2. Rumph. tab. 36. k. 



The name of Bruguiere is so very characteristic of this species, that I think it will justify its 

 adoption in preference to the original but unmeaning one given by Linnaeus. It is the most 

 beautiful of the genus. The throat is of the darkest purple, vivid at its edges, and crossed by 

 white elevated strias ; the ground colour of the inner lip being brownish. The tubercles are 

 always opposite each other. When young, the inside border of the inner lip is flesh colour. It 

 is not common, and fine specimens come from the Isle of France. 



PTEROCERA ROBUSTA. THICK-CLAWED SCORPION. 



P. Testse labio exteriore processibus 6 vel 7 crassis, subcylindraceis, tantilm non rectis 

 armato ; apertura fusca, costis albis densis insequahbus ; canali subrecta. 



Outer lip with six or seven thick, rounded, nearly straight processes ; aperture brown, 

 with thick, unequal, white ribs, channel nearly straight. 



Very distinct, but nearest allied to P. Nodosa ; the claws, instead of being as in that 

 slender, compressed, and knobbed, are thick, round, and smooth ; it is a stout heavy shell. The 

 throat dark brown, with thick irregular ribs. It is very rare, and neither figured nor described. 



PTEROCERA ELONGATA. SHORT-CLAWED SCORPION. 



P. Testae labio exteriore processibus 8 brevibus, latis, compressis armato ; spira producta ; 



apertura striata. 

 Outer lip with eight short, broad, and compressed processes ; aperture striated ; spire 



lengthened. 

 Lister, 868. 23. Martini, 10. tab. 155. f. 1479 & 1480. 

 P. Millepeda, Brug Ency. Meth. 410. fig. \. a.b. 



