112 AMERICAN JOURNAL 



Waldheimia lenticulans, Desli,, Mag. Zool. 1841, pi. xli. 

 Hah. Strait of Fauveau, New Zealand, 



Waldheimia 'pid a ^ Cliemn., Sby. Thes. Conch, vii, p. 351, pi. 

 70, fig. 43, 44. Hah. Java, Japan. 



Waldheimia septigera, Loven, Index Moll. Scandin, 1846, p. 

 29. Hah. Norway ; Japan. 



Waldheimia floridan a ^ Pourt., Bull. Mus, Comp. Zool. No. 7, 

 p. 127. Hah. AVest Indies ; Florida coast. 



Subgenus INIeganteris, Suess. 



3Ieganteris, Suess., (not Hall) Sitz. Ak. Wiss. Klas. Math. 

 xviii, 1856, p. 51, pi. i, figs. 1, 2, 3, 5, 16 and pi. iii, 

 figs. 3 a, 3 b, (J/. Arcldaci). 



Shell orbiculate, somewhat compressed, nearly equivalve. 

 Area of neural valve small, apex inconspicuous, minutely fora- 

 minated, punctate. Deltidia small, wide, united. Cardinal 

 process prominent, with a V-shaped process near the apex for 

 the insertion of the cardinal muscles, sulcated on each side, with 

 the base excavated. Cardinal border broad, wide, rugose. 

 Loop essentially as in Waldheimia, but with very long crura, 

 the main stems of the apophyses being given off at a sharp angle 

 with the crura, reflected abruptly and the posterior part of the 

 reflected loop behind and below the crura. There is a faint 

 mesial septum in the hoemal valve. 



Type 3Ieganteris arehiaci, Suess. Plate viii, fig. 12, 12a. 

 Fossil in the Devonian of the Eisel. 



? Section STRINGOCEPHALINiE, Dav. 



Stringocephalidtv, Dav., 1851, Int. Brit. Brach. p. 73. Loop 

 attached to the crura by their neural edges ? 



Genus STRINGOCEPHALUS. 



iStringocephahis, Dav., (emend) Int. Brit. Brach. p. 73, 1851. 

 Strigocephalus, Defr. Diet. Hist. Nat. Vol. li, p. 102, pi. 75, 

 fig. 1, la, 1827. 



Fig. 10. 



size. A, 

 Animal unknown, pedunculated. Foramen large, triangular 



Fig. 10. Young shell, -I nat. size. A, hiuge area; 6, deltidium ; p, pseudo- 

 deltidium. 



