896 PROCEEDINGS OF THE NATIONAL MUSEUM. voi-.xxi. 



H. and A. Adams, 1858, TelUmya elevata ^ Ball, 1889, and Kelliopsis 

 elevata of Verrill and Bush, 1898. 



FOSSIL LEPTONACEA. 



C. 1 — 73. The descriptions and figures of the fossil species will appear 

 in the Transactions of the Wagner Free Institute of Science, Philadel- 

 phia.^ The full elucidation of the generic synonymy is also reserved 

 for that work. The types of the fossil and recent new species are in 

 the collection of the U. S. National Museum. Most of the fossils were 

 collected by the parties of the U. S. Geological Survey. 



EXPLANATION OF PLATES. 



Wlien not otherwise stated, the figures are from magnified camera Incida drawings, 

 by Mr. W. H. Dall, from the types in the U. S. National Museum. The extreme 

 length in millimeters of the specimen fignred follows each name, together with the 

 number of the specimen in the Museum Register. 



Plate LXXXVII. 



Fig. 1. Erycina(P8eudopythina) compressa Dall] 18.0 mm. No. 107855, U.S.N. M. Ber- 

 ing Sea. 



2. Borniaretif era Dall; 12.0 mm. No. 107856, U.S.N. M. The microscopic reticu- 



lation is too fine to be represented on the scale of the figure. 



3. Myaella iarhadensis Dall; 4.0 mm. No. 95703, U.S.N. M. Barbados. 



4. GeMa pugetensis Dana, with Erycina (Pseudopythina) rugifera Carpenter, at- 



tached by its byssus to the abdomen of the crab behind the limbs. Nat- 

 ural size. Drawn from nature by Dr. J. C. McConnell. No. 15789, 

 U.S.N.M. Puget Sound. 



5. Montacuta limpida Dall; adult type; 3.0 mm. No. 97155, U.S.N.M. Florida. 



6. Mysella aleufica Dall; 4.3 mm. No. 108233, U.S.N.M. Kiska Harbor, Aleu- 



tian Islands. 



7. Mysella tumidaCaT^enteT ; type specimen ; 3.8 mm. No. 5242, U.S.N.M. Cal- 



ifornia. 



8. Hinge of Erycina (Pseudopythina) compressa Dall; right valve, consideral.ly 



enlarged; c, cardinal tooth; j), prodissoconch ; rl, resilium covered by the 

 large calcareous lithodesma; I, raised edge of the valve carrying the 

 linear external ligament. 



9. Sportella stearnsii Dall; enlarged view of hinge, right A^alve, c, c', cardinals; 



I, nymph for the ligament ; j>, prodissoconch ; r, excavation and ridge 

 which carry the resilium. 



10. Montacuta fioridana Dall; interior of right valve; 16.0 mm. No. 64456, 



U.S.N.M. West Florida. 



11. Montacuta limpida Dall; young shell; 1.6 mm. No. 107867, U.S.N.M. Florida. 



12. Sportella stearnsii Dall; 13.5 mm. No. 73071, U.S.N.M. Gulf of California. 



Plate LXXXVIII. 



Fig. 1. Erycina emmonsi Dall; 7.0 mm. No. 92638, U.S.N.M. North Carolina. 



2. Anisodonta(Fulc7-ella) corbuloidea Dull; 6.5 mm. No. 92303, U.S.N.M. North 

 Carolina. 



1 Bull. No. 37, U. S. Nat. Mus., 1889, p. 50. 

 a Volume III, Pt. 5. 



