344 APPENDIX. 



now known \s 11 ; about 40 peculiar. Three of the operculates 

 are found also in Cuba. 



Jamaica, Stoastoma, has two extra-limited species, one in 

 Hayti, and one in Porto Rico. 



Hayti. Gonave has 21 species, of which 8 are operculates. 

 Thei'e are two peculiar species of C^'lindrella, and curiously, a 

 form of Helix sagemon, of Cuba. 



The gradual diminution of genera easterly is curious : Mega- 

 lomastoma disappears ; there is a fossil impression of Strophia 

 in Sombrero, and a fossil species in St. Croix. Strophia, Macro- 

 ceramus, Megalomastoma, Tudora, Cistula, are absent in the 

 Lesser Antilles ; there is one Macroceramus on the Anguilla 

 Bank. C.yclophorus is represented in the West Indies only in 

 the Lesser Antilles. 



Table of Sedimentary Deposits [p. 224]. 

 Strike out from Pliocene the Sumter Period, and insert in 

 Miocene (Eastern U. S.) : 



Carolinian (Sumter), so as to stand opposite Sarmatian 

 [p. 225]. 

 [P. 225.] Instead of Yorktown Period, put 

 i Virginian, 

 ^ (Yorktown,) 



(Marylandian, so as to stand opposite Mediterranean 

 Stages, etc. 

 [P. 226.] (R. h. column, at bottom), instead of " Panfield," 

 read " Punfield." 



[P. 221.] Jurassic (r. h. column\ after " Great Oolite " insert 

 " Dogger." 



[P. 229.] (R. h. column, at top), instead of" Ludovian," read 

 " Ludlovian." 



Classification [p. 252]. 

 Macdonald (Jour. Linn. Soc, xv, 161, 255) discusses the value 

 of some of the characters employed in the classification of the 

 Mollusca, pointing out the existence of several analogous genera, 

 and analogous subdivisions of the Heteropoda and Pulmonata. 

 He proposes the following system for the gastropods : — 

 Division I. Monoecia. 

 Subdivision I. Lingual dentition typically pavimental. 

 Order 1. Pneumonophora. 

 Suborder 1. Pulmonata. 



A. Terrestrial; B. Aquatic; C. Estuary or Marine. 

 Order 2. Apneumonophora. 

 Suborder 1. Nudibranchiata. 



A. Cryptobranchiata (Phylliroe, Elysia, Limapontia, 



etc.). 



B. Phanerobranchiata (Eolis, Doris, Tritonia, Phyllidia, 

 etc.). 



