KLOEDENELLIDAE 



57 



JONESINA SPINIGERA Coopcr, n. sp. 

 Plate 12, figures 16-17 



Carapace somewhat elongate, ends 

 rounded ; venter broadly curved, dorsum 

 straight ; antero-ventral truncation marked, 

 producing distinct retral swing; greatest 

 thickness and height back of center; great- 

 est length central; sulcus fairly shallow, 

 sides parallel for most of length, flaring near 

 cardinal area ; overlap prominent only along 

 venter ; hinge straight ; node or spine short, 

 located in dorsal angles of each valve, that 

 in posterior angle of left valve quite in- 

 distinct. 



Length, 0.64 mm; height, 0.39 mm; 

 thickness, 0.30 mm. 



Paint Creek formation, locality 24, com- 

 mon; Golconda formation, locality 38, 

 rare; Menard formation?, locality 32, rare. 



Length, 0.50 mm; height, 0.30 mm; 

 thickness, 0.15 mm. 



Glen Dean formation, locality 1, rare. 



Genus Lochriella Scott 



The genus Lochriella Scott (1941) is in- 

 termediate between Sansabella and Neokloe- 

 denella, closely resembling the latter except 

 for a different overlap. Sansabella and 

 Lochriella have a prominent overlap along 

 the free margins. Lochriella and Neokloe- 

 denella have a channeled dorsum of variable 

 width and depth along the posterior end 

 of the hinge, although the Sansabella chan- 

 nel is uniformly straight, narrow, and ex- 

 tends along the entire hinge from notch to 

 notch. Lochriella apparently may or may 

 not possess the overlap at the anterior end 

 of the hinge characteristic of all known 

 species of Neokloedenella. 



JoNESiNA TENUisiNUOSA Cooper, n. sp. 

 Plate 12, figures 6-7 



Carapace elongate, ends rounded; venter 

 slightly convex ; hinge straight ; unex- 

 cavated, about four-fifths of total length ; 

 sinus wide, shallow, almost at midlength ; 

 node low, indistinct and located just in front 

 of sinus ; anterior cardinal angle obtuse, 

 posterior one almost 90° ; slight forward 

 swing; overlap along free margins quite in- 

 distinct ; surface smooth. 



Length, 0.73 mm; height, 0.42 mm; 

 thickness, 0.33 mm. 



Golconda formation, locality 19, rare. 



Genus Kloedenella Ulrich and Bassler 



Kloedenella macer Cooper, n. sp. 

 Plate 12, figures 10-11 



Carapace elongate, thin, bisulcate; over- 

 lap around free margins and at antero- and 

 postero-dorsal corners, the latter resulting in 

 sinuous hinge line in dorsal view; dorsum 

 distinctly bowed in central region ; anterior 

 end only slightly curved with pronounced 

 backward swing, forming sharply rounded 

 antero-dorsal angle ; median sulcus the 

 larger and almost central, separated from 

 smaller sulcus by low fold ; a broad, some- 

 what swollen area borders median sinus on 

 anterior side, locating greatest thickness 

 anteriorly; widest (highest) portion of shell 

 and small sulcus posterior. 



Lochriella fenriri 



(Coryell and Johnson) 



Plate 12, figures 28-29 



Sansabella fenriri Coryell and Johnson, 1939, 

 Jour. Paleontology, vol. 13, p. 220, pi. 25, 

 figs. 3a, b, Clore fornmatlon. 



Length, 1.10 mm; height, 0.67 mm; 

 thickness, 0.63 mm. 



Clore formation, locality 27, common. 



Lochriella reversa (Morey) 



Plate 12, figures 18-19 



Sansabella re'versa Morey, 1935, Jour. Paleontol- 

 ogy, vol. 9, p. 476, pi. 54, fig. 6, Amsden for- 

 mation. 



Sansabella gunnari Coryell and Johnson, 1939, 

 Jour. Paleontology, vol. 13, p. 220, pi. 26, 

 figs. 11a, b, Clore formation. 



Re'uersabella reversa. Coryell and Johnson, idem., 

 p. 221, p. 26, figs. 12a, b, Clore formation. 



Length, 1.0 mm; height, 0.67 mm; 

 thickness, 0.50 mm. 



Clore formation, locality 27, common. 



Genus Neokloedenella 

 Croneis and Funkhouser 



Neokloedenella? magna Cooper, n. sp. 

 Plate 12, figures 42-43 



Carapace ovate, wide ; dorsal and ventral 

 margins parallel, latter slightly convex, ends 

 rounded ; hinge line straight in posterior 

 two-thirds of its length, then curves to left 

 due to overlap of right valve, straight por- 

 tion excavated in canoe-shaped channel ; 



