PLIOCENE ECHINODERMATA. 221 



Related forms. — The nearest related American form is Cassidulus bassleri, from which it is 

 readily distinguished by its more depressed form, its angular margin, and the anteriorly excentric 

 position of its peristome. 



Locality. — Neills Eddy Landing, Cape Fear River, N. C. 



Geologic horizon. — Waccamaw marl, Pliocene. 



Collections. — II. S. National Museum; Johns Hopkins University (T 1). 



Suborder STEBNATA. 

 Family SPATANGIDJE. 



Genus SCHIZASTER Agassiz. 



Schizastee (?) stalderi Weaver. 



Plate CIII, figure 2. 



Schizaster (?) stalderi Weaver, 1908, California Univ. Dept. Geology Bull., vol. 5, No. 17, p. 274, PI. XXI, fig. 3. 

 Schizaster stalderi Stefanini, 1911, Soc. geol. italiana Boll., vol. 30, p. 705. 



Description. — Weaver says : 



Test distinctly cordate in form, with, all of the petals deeply sunken. The depression of the anterior petal deeply 

 notches the anterior margin. The petals of the bivium are very short. The mouth opening is situated very far for- 

 ward. The anal opening is not shown. As all of the known specimens are casts, the nature of the plates of the test is 

 only imperfectly shown. 



Dimensions. — Maximum length 30.5 millimeters; maximum width 2S millimeters. 



Locality. — Humboldt County, Cal. 



Geologic horizon. — Wildcat series of Lawson, Pliocene. 



Collection. — University of California. 



