225 



MEKIf^TELLA HASKIX^I. Hall. ( FJg. l^U. ) (I'jli. \. V., 



Vol. rV., p. 30(), PL XLIX.) 



Distinguishing CluucU-ters.— l^voaiWy ovate outline, with 

 j;reatest width anterior to the middle; length and width 

 about equal; slight sinuation in front ; anehylosed deltidial 

 plates; fine, thread-like, concentric surface strife, and occa- 

 sionally faint radiating striae. 



Foundinthe Encrinal limestone, at Secti(jn .^(riithei- rare). 



Mekistklla kostkata. Hall. (Fig. 

 135.) 



(Pal. X.Y., Vol. IV.. ]). 307, Pis. L., 

 LXin.) 



Distinguishing ( 'linntcters. — Small 

 size; greater length thnn width, 

 rounded belo^Y and often subattenu- 

 nte above; shallow, rounded sinus in 

 l)edicle valve; fine concentric sti-iie, 

 and, in exfoliated specimens, slender, 

 distant, radiating strije. 



Found in the Encrinal limestone, at ^^^^ ^35 ^i^rtsteua rostrata. 



t.^^^+-i^v,^ " i-„r>-,,.^\ Profile, dorsal, ventral, and front 



neCtlOn .) (laie). views of a specimen ( from Hall). 



Fig. 135A. Meristella barrisi. Dorsal, lateral, and cardinal views of an elongated 

 individual ; dorsal views of two other individuals (from Hall). 



