72 DE. T. DAVIDSON ON EECENT BEACHIOPODA. 



Plate IX. 



Figs. 1, 1 a. Waldheimia venosa, var. dilatata, Lamarck. Type of Lamarck's Terebratula dilatata, from 

 a drawing made in Paris from the type in the Museum d'Histoire Naturelle, Paris. 



J'igs. 2-'13. Waldheimia lenticuluris, Deshayes, sp. A series of specimens of different forms and ages from 

 the Straits of Fouveau, New Zealand, in 15 fathoms water (Davidson Collection^ Geol. Dept., 

 British Museum). 2-3 b. Large specimens. 10. Interior of dorsal valve, showing loop in the 

 adult condition. 11-13 a. Modifications assumed by the loop previous to its attaining the 

 adult state. 



Plate X. 



Figs. 1-4. Waldheimia Grayi, Davidson. 1, 1 a, 2. Typical form. 3. Interior of dorsal valve, to show the 



loop. 4j 4 a, 4 b. Variety transversa. All dredged from Japanese waters except the specimen 



shown in fig. 2, which was dredged by Sir E. Belcher in the Straits of Corea. (Davidson 



Collection, Geol. Dept., British Museum. ) 

 Figs. 5, 6. Waldheimia Wyvillii, Davidson. 5, 5 a. Exterior of shell. 6. Interior of dorsal valve, 



enlarged, showing the loop. Dredged by 'Challenger' Expedition, lat. 33° 31' S., long. 



74° 43' W., depth 21G0 fathoms. (Zool. Dept., British Museum.) 

 Figs. 7-17. Waldheimia kerffuelenensis, DnYidson. 7-15. A series of forms of different ages. 16. Interior 



of dorsal valve, showing the loop. 17. Interior of dorsal valve, showing the labial appendages. 



All dredged by the ' Challenger ' Expedition south of Kerguelen Islands, also off Marion Islands. 



Found in depths varying from 100 to 150 fathoms. AU the specimens figured are in the Zool. 



Dept., British Museum. 



Plate XI. 



Figs. 1-10. Waldheimia septigera, Loveii,sT^. 1-1 c. From Faeroe Sound, 570 fathoms (Davidson Collec- 

 tion, Geol. Dept., British Museum) . 2-2 b. A very large broad specimen, after Sars. 3. A young 

 example, from the British sea, between Shetland and Faeroe (' Porcupine ' Expedition), depth 345 

 fathoms. 4. Interior of dorsal valve with its fully developed loop. 5. Profile view of the same 

 (after Sars). 6. View of the loop seen from the front, much enlarged. 7-10. Different stages in 

 the development of the loop, after H . Friele, figures magnified ; all from Norwegian waters. 



Figs. 11-13. Waldheimia Kaphaelis, Dall. 11-11 e. A very perfect example from off the coast near 

 Jeddo, Japan (Davidson Collection, Geol. Dept., British Museum). 12, 12a. A large typical 

 example from Sagami Bay, coll. Dr. Doderlcin. 13. Interior of dorsal valve, showing its fully 

 developed loop. 12-13. In the Museum of the Smithsonian Institution, Washington, U.S.A. 



Plate XII. 



Figs. 1-5. Waldheimia floridana, Pourtales, at different ages, dredged by Agassiz and de Pourtales off 

 Florida reefs, between 100 and 200 fathoms (Davidson Collection, Geol. Dept., British 

 Museum). 5. Interior of dorsal valve, to show the loop. 



Figs. 6-10. Waldheimia {or Macandrevia) /t'Me?-«, Jefireys, sp. 6-6 b. Specimen of the natural size. 7. In- 

 terior of ventral valve, enlarged. 8. Interior of dorsal valve, to show the loop. 9. Posterior portion 

 of the interior of the dorsal valve very much enlarged, to show the hinge-plate and septa. 10. A 

 very young example in which a small pillar-shaped ventral septum is seen in the interior of the 

 dorsal valve. These figures, drawn by Davidson, were published by Jeffreys in the Proc. Zool. 

 Soc. for 1878. Dredged by Dr. Gwyn Jeffreys, lat. 56° 11' N., long. 37° 41' W., 'Valorous' 

 Exjjedition, at a dejjth of 1450 fath. (Jeffreys Collection, Smithsonian Institution, Washington, 

 U.S.A.) 



