80 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 39 



Plate 10 

 Hispanirhynchia 



Page 



Hispanirhynchia cornea (Fischer) 59 



Figs. 1-21. 1-3, Respectively dorsal, anterior, and side views of a com- 

 plete specimen, X i» hypotype U.S.N.M. 130327a. 9, Pedicle valve in- 

 terior of same tilted to show small dental plates, X 2 - 4> Exterior of 

 preceding hypotype showing fine costellae, X 2. 5, Anterior of pedicle 

 valve of another specimen, X 3, showing fine, subdued costellae, 

 U.S.N.M. 130327b. 6, 8, Two views of the interior of the preceding 

 pedicle valve, X 2, showing teeth, dental plates, small muscle field, 

 and pallial marks. 7, Interior view of another pedicle valve showing 

 teeth and pallial marks, X 2 > hypotype U.S.N.M. 130327c. 10, Beak 

 of preceding, X 4, showing teeth, foramen, and remnantal deltidial 

 plates. 11, Interior of the brachial valve of a young specimen 

 showing strong development of inner hinge plates, X 2 > hypotype 

 U.S.N.M. I30327d. 13, Same, X 6, showing inner hinge plates in 

 great detail. 12, Same specimen as preceding, X 4> tilted to the side 

 to show the spinulifer laterally flattened crus with serrated distal 

 extremity, the inner hinge plates, and corrugated socket. 14, Same as 

 preceding tilted to show junction of septum and inner hinge plates, 

 X 4- 15, Posterior of an old specimen showing deeply impressed ad- 

 ductor field, X 3, hypotype U.S.N.M. 130327c. 16, Same, ca. X 6, 

 tilted to show inner hinge plates and median ridge. 17, Interior of 

 another brachial valve showing pallial sinuses, small genital areas, 

 and cardinalia, X 2, hypotype U.S.N.M. 130327a. 19, Same tilted to 

 show direct view of cardinalia and septum, X 2 - x 8, 20, Same speci- 

 men, respectively side view showing bladelike spinulifer crura and 

 view showing strong socket ridges and inner hinge plates, ca. X 6. 

 21, Interior of another brachial valve tilted to show socket ridges, 

 inner hinge plates and rostral chamber, X 3, hypotype U.S.N.M. 

 130327c 

 Recent, 240 fathoms off the coast of Mogador, Morocco. 



Plate ii 

 Rhytirhynchia and Basiliola 



A. Rhytirhynchia sladeni (Dall) 35 



Figs. 1 -11. 1-3, Respectively anterior, side, and dorsal views of a com- 

 plete specimen showing anterior costation, X l > lectotype U.S.N.M 

 1 1 1086. 4, 5, Respectively full and tilted views of the interior of the 

 pedicle valve showing pallial sinuses, small conjunct deltidial plates, 

 deeply incised muscle scars, and pedicle collar, X 2 - 6, Posterior of the 

 pedicle valve of the lectotype, X 3, showing small foramen, conjunct 

 deltidial plates, and corrugated teeth. 7-9, Respectively anterior, full, 

 and partial side views of the interior of the brachial valve showing 

 cardinalia, deeply impressed adductor field, and pallial sinuses, X 2 « 

 10, Partial side view of the falcifer crura showing serrate distal ex- 

 tremity and corrugated socket, X 4« Hi Posterior view of the same 



