436 



2. Plicatula ceistata (pi. xc. f. 8.), Lam. Anim. s. vert, 

 vol. vi. p. 185. P. reiiiformis, Lam., inclusa, I/Orb. 



P. testa solida ; plicis paucis, magnis, angulatis, ad angulos 

 fuscis, ad latera rubro-lineatis. Variat testa alba. 



Having the plicae larger, more angular, and less numerous 

 than P. ramosa, and not generally divided, as in that species. 

 Mr. Dyson has brought a white variety from Honduras Bay ; Mr. 

 Adams has collected the ordinary variety at Jamaica. 



3. Plicatula depressa (pi. xc. f. 7.), Lam. Anim. s. vert, 

 vol. vi. p. 185. 



P. testa solida, plicis numerosis, raro divisis ; colore per lineas 

 et punctas disposito. 



The folds are much more numerous than in the other species, 

 and very few of them divided. The flatness from which the spe- 

 cies is named, is merely an accident in the specimen. 



4. Plicatula australis (pi. xci. f. 20 to 22.), Lam. Anim. 

 s. vert. vol. vi. p. 185. 



P. testa tenui, subrotundata, depressa, nigro punctata; plicis 

 parvis, irregulariter ramosis, imbricatis, interruptis. 



The slightly raised ribs are irregularly branched, and occasion- 

 ally interrupted by turned up points. The shell is generally 

 spotted with black, but it occurs smooth, and without spots. The 

 form is not so angular as in other species. 



Prom Australia, Lamarck. Philippines, Cuming. 



5. Plicatula Philippinarum (pi. xc. f. 5? 9, 10, 11, 13, 

 14. p. xci. f. 23?) Hanley, Recent Shells. 



P. testa sohda, rubro vel nigro lineata, plicis magnis, continuis, 

 angulatis, raro divisis, angulis subimbricatis. 



This species has large, angular plicae, more numerous than in 

 P. cristata, and generally imbricated at the angles. The lines of 

 colour are longer. In the shells represented by figures 9, 1 and 

 11, no part of the surface is plicated, because no part has grown 

 freely. In fig. 23, the ribs and even the lines of growth in the 

 area to which the lower valve is attached, is -shown distinctly on 

 the outside of the upper valve. 



Collected by Mr. Cuming in the Philippine Islands. 



