GASTROPODA— FUSOIDEA. 



779 



565. L. subtenuis (Heilprin). (Fig. 1137.) Eocenic. 



Whorls rounded but with a flattening above the last spiral, and 

 below the strong subsutural spiral, which sometimes produces a 

 channeling of the suture; spirals strong and simple. Ribs well 

 defined on young whorls, but fainter or obsolete on the adult. 



Fig. 1 136. Pseudolathyrus torlilis. 

 (After Harris.) 



Fig. 1 137. Lirofusus subtenuis, en- 

 larged. (Md. Survey. ) 



Pamunkey of Maryland and Virginia; Chickasaw an (Lignitic) 

 of Alabama. 



CLXIX. Fulguroficus Sacco. 



Shell small, fulguroid, with low spire, and patulous, wide canal, 

 and several peripheral angulations. Surface with ribs which 

 become sharply nodose on the angulations. Eocenic. 

 566. F. argutus Clark. (Fig. 11 38, a, b.) Eocenic. 



C Md 



Fig. 1 138. a, b, Fulguroficus argutus ; c, d, Fusoficula juvenis. (Md. Survey.) 



Body whorl with three strong angulations rather far apart, and 

 nodose where they cross the thin, rather sharp and distinct ribs; 

 early whorls more or less rounded. 



