PLICATULA. 



Species 8. (Fig. a, b, Mas. Brit.) 



Plicatula Essingtonensis. Pli. testd magnA, suli- 

 (Bquilaterali ; pUcis numerosis, cinnamoneo minute 

 lineatim notatis, divaricatis, raro divisis, angitlatis. 



The Port Essington Plicatula. Shell large, nearly 

 equilateral; plaits numerous, rather obtuse, 

 minutely linearly marked with cinnamon, diver- 

 gent, rarely divided, angiUar. 



SowEniiY. 



Hah. Port Essington, Australia. 



The ribs are more niuncrous, less divergent, and less 



deep than PUcalida Fhilippinarum. 



Species 9. (Fig. a, h, Mus. Brit.) 



Plicatula muricata. Pli. testd parvd, trigond, cinna- 

 moned, vcl albd, maculis trigonis, subradiatis pictd ; 

 plicis creberrimis, angulatis muricatif, aciiti siib- 

 aadeatis. 



The mukicated Plicatula. Shell small, trigonal, 

 cinnamon coloured, or white, painted with tri- 

 gonal partly radiating spots ; plaits very numerous, 

 angular, muricated, acutely subaculeated. 



A. Adams. Proc. Zool. Soc. 



Hal. ? 



A very pretty, characteristic little species. 



Species 10. (Fig. a, r, d, Mus. Brit.) 



Plicatula Australis. Pli. tct^td snhrotundd, de- 

 pn't^sd, tcmiiksculd, niyro punclatd ; j)licis parvis, 

 numerosis, obtusis, divaricatis, rumosis, imbricatis, 

 prope marginem aeuleatis. 



The Australian Plicatula. Shell roundish, depressed, 

 rather thin, black spotted ; plaits small, numerous, 

 obtuse, divergent, branclied, imbricated, aculeated 

 near the margin. 



Lamarck. Anim. s. Vert., vol. vi. 85. 



Huh. Australia, Lamarck. Philippines, Cuming. 



The linguiform specimen is only an instance of 

 irregular growth. 



Species 11. (Fig. 10, b, Mus. Brit.) 



Plicatula acdleata. Pli. testd albd, ovatd, tenvi, 



aculeis fornicatis divaricatis armatd. 

 The aculeated Plicatula. Shell white, ovate, thin, 



armed with vaulted prickles. 

 Sowerby. 



Plicatula duhia, var. Sowerby, Thes. Conch. 

 Hah. ? 



October, 1873. 



