182 



Fk; :u L nijula leano 

 Ventral valve, Datura 

 sizi- i from Mali >. 



Lingula (Glossina) leana. Hall. (Fig. 79.) (Pal. 

 \. Y.. Vol. IN'., p. ( .». PI. II. i 

 Distinguishing Characters.— Size: robust cha meter; 

 pointed posterior (beak) end, with sides 

 gradually sloping outward for two-thirds 

 the length; rounded anterior end; Rome- 

 what greater convexity near the beak 

 than near the front; fine concentric 

 growth lines and occasionally faint radiat- 

 ing lines. 



This species was found at Section 7. 

 between eight and fourteen feet, and at twenty feet, below 

 the Encrinal limestone. 



Measurements. — 12 by 9 mm., also 13 mm. bv 10 mm. in 

 greatesl length and width. 

 Lingula delia. Hall. ( Fig. 80.) ( Pal. X. V.. Vol. IV.. 

 ].. 12, PI. II.) 



Distinguishing Characters. — Length 



about twice the width; abruptly sloping 



cardinal margins; gently curving sides: 



rounded front; fine lines of growth, and 



^-"- '■■-''' occasionally coarser concentric lines: a 



Pra.w. unmdafciia. median longitudinal depression appears in 



Natural size From Hall). to i I ' 



one valve, marking the position of a septum. 

 Found in the Demissa bed. at Section 5 : ten feet below 

 the Encrinal limestone, at Section 7: and twenty-five feet 

 below the Encrinal limestone, in Idlewood Ravine. 



Lingula spatul ata. Vanuxem. (Fig. 81.) (Pal. N. Y., 

 Vol. IV.. p. 13, PI. I.) 



Distinguishing Characters. — Small size, spatu- 

 late Form; general form and proportions similar 

 to preceding, but very much smaller; outline 

 somewhat variable: occasionally acutely pointed ; 

 fine concentric growth-lines; occasional faint 

 radiat ing stria 1 . 



Found in the Upper Naples (Gardeau) shales 

 on Hie Lake Shore: in the Lower Naples 



I ig 81 Lm- 

 ipih, i„it ni, ,/,, . 

 Enlarged, x i. 

 Genesee shale. 

 '< iriginal. i 



