• 



cushman: byram calcareous marl 199 



because specimens were not abundant enough for specific 

 determination. These may be compared with the data given 

 by Cooke, ^ who mentions 136 species of mollusks and 6 of corals, 

 55 of which are pecuhar to the marl at Byram. Most of the 

 species indicate that they lived in warm water at no great depth. 



Distribution of a few of the species 



A few of the species found in the Byram marl are especially 

 interesting in showing relationships of this fossil fauna with those 

 now living. Of these Textularia folium Parker and Jones shows 

 this point very well. 



Textularia folium Parker and Jones is known only as a living 

 species with the following records: Mauritius, the Kerimba 

 Archipelago off southeastern Africa; shore-sands of Melbourne, 

 Australia; off East Moncoeur Island, Bass Strait, 38 fathoms; 

 off Raine Island, Torres Strait, 155 fathoms; off Kandavu, Fiji, 

 255 fathoms; off Levuka, Fiji; Nares Harbour, Admiralty Islands, 

 17 fathoms; and Honolulu coral reefs, 40 fathoms. Other 

 records are from the lagoon at Funafuti; off the coast of Victoria; 

 off Laysan, and numerous localities off the Hawaiian Islands. 

 Most of the records for this species are in 40 fathoms or less 

 although a few are at somewhat greater depths. It seems to be 

 most abundant on tropical coral reefs in the South Pacific, but 

 as these records show, it is well scattered over the Indo-Pacific 

 region. The finding of very typical specimens of this species 

 in the Byram marl has led to the examination of the distribution 

 of other species found with it. A few of these will be mentioned. 



Bolivifia amygdalaeformis H. B. Brady. This is known from 

 the South Pacific, Australian, East Indian and Philippine regions 

 at the present time. 



Bolivina niiida H. B. Brady. This is a very rare species de- 

 scribed by Brady from two Challenger stations off Australia, 

 and not known elsewhere. 



Polymorphina regina H. B. Brady, Parker and Jones. This 

 is known from the Miocene of the Coastal Plain, the Calvert 

 formation of Chesapeake Beach, Maryland, and from the Duplin 



^ This Journal 8: 197. 1918. 



