112 AMERICAN JOURNAL 



Waldlieimia lenticularis^ Desh,, Mag. Zool. 1841, pi. xli. 

 Hah. Strait of Fauveau, New Zealand. 



Walclheimia picta, Chemn., Sby. Thes. Conch, vii, p. 351, pi. 

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



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

 29. Hah. Norway ; Japan. 



Wahilheimia Jioridana,- Voui't., Bull. Mus. Comp. Zool. No. 7, 

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



Subgenus Meganteris, Sucss. 



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

 xviii, 1856, p. 51, pi. i, figs. 1, 2, 8, 5, 16 and pi. iii, 

 figs. 3 a, 3 b, (il/. Arcliiaci). 



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 Waldheiinia, 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 haemal valve. 



Type Meganteris archiaci, Suess. Plate viii, fig. 12, 12a. 

 Fossil in the Devonian of the Eisel. 



? Section STRINGOCEPHALIN^, Dav. 



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

 attached to the crura by their neural edges V 



Genus STRINGOCEPHALUS. 



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

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

 fig. 1, la, 1827. 



Fig. 10. 



Fig. 10. Young shell, i nat. size. /;, binge area; b, deltiilium ; p, pseudo- 

 deltidium. 



Animal unknown, pedunculated. Foramen large, triangular 



