13 



absence of ornamentation from its inferior surface, and the cruci- 

 form aspect which the final whorl of chambers assumes. Lower 

 Bed, moderately common. 



Genus — Planorbulina, iVOrhiyny. 



142. *P. mediterranensis, d'Orb. Lower Bed, rare. 



143. *P. acervalis, Br. Lower Bed, a single example, but char- 

 acteristic. 



144. *7*. Jar rata, P. and J. A very symmetrical discoid test, 

 often developing on superior surface tubercular growth of shell 

 substance. In the recent condition it is an exclusively tropical 

 species. The specimens from Muddy Creek are rarely tubercu- 

 lated, but exhibit a smooth flat test with regularly imbricated 

 margin. Lower Bed, moderately common. 



Genus — Truncatulixa, cVOrhiyny. 



145. *7'. lobatuJa, W. and J. Lower Bed, rather scarce, 



146. *T. variabilis, d'Orb. Several irregular-growing examples 

 liave been referred to this species. Lower Bed, rare. 



147. T. reticulata, Czjzek, Lower Bed, moderately common. 

 Upper Bed, rare. 



148. ^T. ecliinata, Br. A globose shell with large circular 

 aperture, the surface of test more or less studded with short blunt 

 spines irregularly distributed. In the recent condition it is mostly 

 a coral-reef species. Lower Bed, rather scarce. 



149. T. echinafa, var. la^viyata, var. nov. PL i., tig. 8. 

 Closely resembles the typical form in general features, but is 



devoid of all spinous appendages, the exterior surface of test 

 being perfectly smooth. The aperture is also less conspicuous 

 than in T. echiiiata, and has no bordered rim as in that form. It 

 is more common than the type in the Muddy Creek material, and 

 as such seems to require at least a varietal distinction. Lower 

 Bed, moderately common. UiDper Bed, rare. 



150. 2\ Unyeriana, d'Orb. Lower Bed, common. Upper Bed, 

 rather scarce. 



151. T. Haidinyerii, cVOvh. Lower Bed, rather scarce. Upper 

 Bed, rare. 



Genu.s — Axomalina, d'Orhiyny. 



152. *^1. rotnla, d'Orbigny. Lower Bed, rare. 



153. A. aminonoides, Rss. Lower Bed, moderately common. 

 Upper Bed, rare. 



154. *^1. 2>oly)norpha, Costa. Three examples, two of which 

 are spinous. Lower Bed. 



Genus — Carpenteria, Gray. 



155. '^C.j^'t'oteiformis, Goes. Yery fine examples up to two-fifths 



