96 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Description. — Test ovate, only slightly longer than broad, rapidly 

 tapering from the subacute initial end to the greatest breadth at 

 the last-formed chamber, compressed; chambers few, increasing rap- 

 id}}' in size as added, inflated, the periphery with numerous fine 

 longitudinal costae; remainder of chamber smooth and polished; 

 sutures very distinct, depressed; wall thick; aperture with an elon- 

 gate depression, formed by two lip-like projections from the end 

 of the test. 



Length up to 2.50 mm. 



Distribution. — The first record for this as a recent form is that 

 of Brady in the Challenger report who speaks of it as follows: " The 

 larger Lingulinae, not uncommon in certain areas of the North 

 Atlantic, are seldom really carinate, but the lateral edges of the 

 test are slightly rounded, and each margin is ornam?nted with a few 

 delicate longitudinal ribs. With this exception the lateral faces 

 are smooth." He gives 6 Challenger stations in the North Atlantic 

 for this form, ranging from 390-862 fathoms (713-1,577 meters). 

 Two of these are definitely given: Station 24, off Culebra Island, 

 West Indies, 390 fathoms (713 meters) , and station 75, off the Azores, 

 450 fathoms (823 meters), from which stations he obtained the finest 

 specimens. He also gives two stations in the South Atlantic, 350 and 

 675 fathoms (640 and 1,234 meters), off Pernambuco, Brazil, and 

 records it in the Mediterranean in 1,200 fathoms (2,195 meters). 

 Flint recorded this form from the Gulf of Mexico, 169 and 170 

 fathoms (309 and 311 meters). Chapman has recorded it as very 

 rare in 200 fathoms (366 meters), outside the Funafuti Reef in the 

 Pacific. Heron- Allen and EarlancP^ record and figure some small 

 specimens with two chambers which they refer to this form, but after 

 seeing a large series of the typical form from the western Atlantic, 

 I do not think that their form from off the British coast is the same. 

 The Albatross specimens, as the table shows, range from the coast 

 of Brazil northward into the Caribbean and Gulf of Mexico, with 

 one station off the coast of Georgia and one farther north, along the 

 eastern coast of the United States. 



Some of the specimens have the costae of the periphery practically 

 wanting, but usually traces may be seen near the base and the 

 periphery even in such cases is rounded and not carinate. 



s» Trana Linn. Soc. London, ser. 2, vol. 11, 1916, p. 2o9, pi. 42, figs. 6, 7. 



