KIRKBYIDAE 



47 



acute, posterior greater; hinge line very 

 slightly channelled ; second false keel up- 

 turned or flaring, somewhat separated from 

 first, flare making ends of valves strongly 

 concave near the keel; upper-middle area 

 strongly convex; reticulations polygonal, of 

 average size; pit ovate, located well below 

 center of shell. 



Length, 1.17 mm; height, 0.58 mm; 

 thickness, 0.67 mm. 



Kinkaid formation, locality 3, common. 



K. humerosa may be distinguished from 

 K. symmetrica Croneis and Thurman by 

 the more prominent shoulder, asymmetrical 

 outline, and by the more closely spaced false 

 keels. 



KiRKBY cf. REFLEXA Girty 



Plate 10, figures 27-28 



Kirkhya reflexa (not Ainphissites reflexus) Girty, 

 1910, Ann. New York Acad. Sci., vol. 20, 

 p. 235, Fayetteville shale. 



Length, 1.13 mm; height, 0.53 mm; 

 thickness, 0.46 mm. 



Golconda formation, locality 17, rare. 



Genus KiRKBYELLA Coryell and Booth 



KiRKBYELLA SULCATA Coopcr, n. Sp. 

 Plate 10, figures 13-14 



Carapace ovate, ends rounded ; dorsum 

 slightly curved, venter slightly concave ; 

 greatest height anterior; greatest thickness 

 midway between dorsum and venter, back 

 of median sulcus which is deepest ventrally ; 

 ventral ridge terminated abruptly by verti- 

 cal furrow crossing posterior end of shell 

 near margin ; surface reticulae in sublongi- 

 tudinal rows. 



Length, 0.43 mm; height, 0.25 mm; 

 thickness, 0.20 mm. 



Paint Creek formation, locality 2, rare. 



Resembles K. truncata n. sp. in the pos- 

 terior vertical furrow, but differs in the 

 narrowing of the posterior end and the con- 

 cave venter. 



KiRKBYELLA TRUNCATA Cooper, n. sp. 

 Plate 10, figures 8-9 



Carapace ovate in lateral view, anterior 

 end rounded, posterior straight, vertical ; 

 dorsum and venter slightly convex ; greatest 

 thickness near venter; vertical sulcus-like 

 trough crosses posterior end near margin re- 

 sulting in pinched-in appearance in dorsal 



view; median sulcus shallow; surface reti- 

 culae in subhorizontal rows, producing ir- 

 regularly striated appearance. 



Length, 0.48 mm; height, 0.30 mm; 

 thickness, 0.21 mm. 



Menard formation, locality 30, rare. 



This species differs from most Kirkbyella 

 by the vertical trough near the posterior 

 end, and from J^. sulcata n. sp. by its more 

 quadrate outline. 



Genus Savagella Geis 



Savagella? acuminata Cooper, n. sp. 



Plate 11, figures 7-9 



Carapace subrhomboidal in lateral view, 

 ends rounded ; dorsum straight, venter 

 slightly curved ; forward swing moderate ; 

 dorsal outline strongly acuminate; hinge 

 straight, slight narrow channel in posterior 

 half, small notch at posterior end; pit small, 

 shallow, circular, located just above and in 

 front of center ; overlap right over left ; 

 very indistinct around free margins ; surface 

 marked by coarse reticulations, quite vari- 

 able in size and shape ; greatest thickness in 

 postero-ventral quarter; greatest height 

 anterior. 



Length, 0.91 mm; height, 0.51 mm; 

 thickness, 0.51 mm. 



Renault formation, locality 12, rare; 

 Golconda formation, locality 18, rare; 

 Vienna formation, locality 10, rare; Men- 

 ard formation, locality 20, rare. 



The overlap of this species, although quite 

 indistinct, is opposite to that given by Geis 

 (1932, p. 168) for the Salem species. S. 

 acuminata also resembles Kirkbyella Coryell 

 and Booth in the position of greatest tumid- 

 ity, but lacks the sulcus and the lobe border- 

 ing the venter. The general lateral outline, 

 surface markings and the pit favor the class- 

 ification with Savagella. 



Subfamily Amphissitinae 

 Cooper, n. subfam. 



The original description of Amphissites 

 was emended and enlarged by Knight 

 (1928) and by Roth (1929). The latter 

 considers Amphissites a subgenus of Kirkhya 

 while Knight, and Bassler and Kellett 

 (1934) have followed the original author 

 by giving it generic rank. Recent work on 

 Carboniferous ostracode faunas, especially 



