437 



6. Plicatula imbricata (pi. xc. f. 6. pi. xci. f. 15 to 18.), 

 Menke, Moll. Nov. HoUandise, p. 35. 



P. testa subfoUacea; plicis aiigulatis^ magnis, altematim divisis, 

 ad angulos foliis extantibus fornicatis, imbricatis ; colore fulvo, 

 lineis rubris. Yariat fuscoj et albo, Uneis nullis. 



The folds are angular, with foliaceous vaulted imbrications, the 

 average form and number of which are shown in fig. 18. Fig. 6 is 

 extreme specimen with which we are favoured by Mr. Hanley. 

 Pig. 15, 16 represent the Chinese variety. Pig. 17 is of a specimen 

 collected at the Bay of Manila, Island of Corregidor, by Mr. 

 Cuming. The var. fig. 18 was collected by Mr. David Dyson at 

 Hondurus Bay. 



7. Plicatula dubia (pi. xc. f. 12? pi. xci. f. 19. Hanley, 

 Recent Shells. 



P. testa tenui, foHacea, depressa subrotundata ; phcis brevibus, 

 interruptis, irregularibus, foliis extantibus fornicatis truncatis non- 

 nuUis; colore fusco rubescente, fusco maculato, prope umbones 

 punctato. 



Similar to P. awstralis, but with the interrupted plicae more 

 irregular, and fewer ia number, with occasional upturned vaulted 

 ends. 



Collected by Mr. Cuming at the Island of Samar, and at the 

 Island of Cana, "West Columbia. 



LIST OP FIGURES IN PLATES XC. AND XCI. 



Fig. 



1 to 4. P. ramosa, sp. 1. {P.gibbosa, Genera of Shells.) 



5. — PhUippinarum, var. sp. 5. 



6. — imbricata, 6. 



7. — depressa, 3. 



8. — cristata, 2. 



9 to 11. — Philippinaruui, 5. 

 13. — dubia, var. (?) sp. 7. 

 13, 14. — Philippinarum, 5. 

 15 to 18. — imbricata, 6. 



19. — dubia, 7. 

 20 to 22. — australis, 4. 



23. — Philippinarum, var. (?) sp. 5. 



