NO. 5 RHYNCHONELLOID BRACHIOPODS — COOPER 8l 



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 brachial valve, X 4, showing curved socket ridges, modestly developed 

 outer hinge plates, incipient inner hinge plates, and falcifer crura. 

 Recent, Sealark Expedition, 1905, Station CI, 123 to 158 fathoms, 

 south of the Saya de Malha Banks, Indian Ocean. 

 B. Basiliola beecheri ( Dall) 25 



Figs. 12-16. 12-14, Respectively side, anterior, and dorsal views of a 

 complete specimen showing the smooth exterior fold, X h hypotype 

 U.S.N.M. 334678. 15, Dorsal view of the same specimen, X 2. 16, 

 Posterior of the preceding specimen showing conjunct, auriculate 

 deltidial plates, X 3- 



Recent, U. S. Bureau of Fisheries Station 4130, 283 to 309 fathoms, 

 46.1° F., near Kauai Island, Hawaiian group. 



Figs. 17-23. 17, 18, Respectively tilted and full views of the pedicle 

 interior of another specimen showing deeply impressed muscle scars 

 and pallial sinuses, X 2, hypotype U.S.N.M. 334679. 19, Posterior of 

 the preceding pedicle valve, X 4, showing corrugated teeth, conjunct 

 and auriculate deltidial plates. 20, 21, Respectively full and anterior 

 views of the brachial valve of the preceding pedicle valve showing the 

 cardinalia and pallial marks, X 2. 22, Posterior view of the cardinalia 

 of the preceding specimen showing socket ridges, corrugated sockets, 

 broad outer hinge plates, and falcifer crural plates, X 4- 23, Side 

 view of the preceding specimen showing the broad, distally serrate, 

 falcifer crura and the corrugated sockets, X 4- 

 Recent, 147 to 198 fathoms, 49° F., off west coast of Hawaii. 



Plate 12 



Basiliola 



Basiliola pompholyx Dall 27 



Figs. 1-6. 1-5, Respectively dorsal, posterior, anterior, ventral, and side 

 views of the lectotype, X 1, showing robust form, smooth exterior 

 and strong dorsal fold, U.S.N.M. 229301b. 6, Beak of the preceding 

 specimen, X 3. showing small round foramen and auriculate deltidial 

 plates. 



Recent, U. S. Bureau of Fisheries Station 5592, 305 fathoms, 

 43-3° F., gravel and mud bottom, Sibuko Bay, south of Silungan 

 Island, Borneo. 

 Figs. 7-15. 7, Posterior of the pedicle valve of another specimen, X 4> 

 showing corrugated teeth, and conjunct and auriculate deltidial plates, 

 hypotype U.S.N.M. 274135. 8, 9, Respectively full and tilted views of 

 the preceding pedicle valve, X 2, showing dental plates, muscle area 

 and pallial sinuses. 10, Interior of the apex of the preceding pedicle 

 valve, X 4, showing pedicle collar, auriculation of deltidial plates, 

 corrugated teeth, and small genital areas, n, 12, Tilted and full 

 views of the interior of the brachial valve of the preceding specimen 

 showing cardinalia, pallial sinuses, and muscle scars, X 2. 13, 14, Two 

 views of the apex of the preceding brachial valve tilted to show the 

 cardinalia in partial side and partial anterior position, the strongly 

 corrugated sockets, and the broad outer hinge plates, X 4- 15, Poste- 



