238 ME. E. T. NEWTON ON MESOZOIC EOSSILS [May I9OI, 



Lamellibranchiata. 



Area (?). See PI. IX, fig. 14. 

 Astarte sp. 



Avicula lanceolata, Sowerby. 

 ^Cardinia Listeri (Sowerby). 



* Cardita Heherti, Terq uetn. 



* Goniomya sp. (cf. rhomhifera, Goldfuss, and sinemuriensis, Oppel). 

 *Gri/phcea arcuata, Lamarck. 



Inoceramus (Crenatula) sp. 

 ^Liraa pectinoides ? (Sowerbj). 

 *Lima stuccincta (Schlotheim). 



Modiola sp. 

 *Myoconclia psilonoti (?J Quenstedt. 



^ucula sp. (two forms). 

 *Nuculana (Leda) Tatei, Newton (=X. Benevieri, Tate). 



„ „ (cf. L. Quenstedti, Tate). 



*Ostrea irregularis (1) Queustedt. 



Tecten {CMamys) subulatus (1) Goldfuss. 



Fholadomya (1). 



Protocardium tmncatwn ? ( Sowerby). . 



Tancredia 0) Peachi sp. nov. 



* Unicardium cardiaides (Phillips). 



Annelida. 



JDitnirpa glohiceps (Quenstedt). 

 Ditnipa sp. 

 *Serpula sp. 



Ckinoidea. 



P.entacrinus hasaltiformis (?) Miller. 



Plants. 

 Wood. 



3. Cretaceous.. 



In June 1900, Mr. Peach detected foraminifera, ini cherty lime- 

 stone in Ballymichael Glen (Arran), specimens of which were sent to 

 me for examination. A further piece of cherty limestone (No. 9227), 

 collected by Sir Archibald Geikie from Pigeon Cave (Arran), was 

 received by me in October. Thin slices of the latter, examined 

 microscopically, showed no definite organisms, yet the saccharoidal- 

 crystalline condition and the faint traces left by organisms were so 

 like certain sections of Antrim Chalk, with which they were com- 

 pared, that there seemed little doubt as to the specimen being of 

 like age. A collection of specimens of chert and limestone was 

 made from Ballymichael Glen by Mr. Macconochie, which was also 

 forwarded to me. Definite organisms could be seen in some of these 

 with a lens, and several of the most promising were selected and 

 sliced for microscopic examination. 



This dark, grey, hard limestone, with angular fragments of white 

 chert, is unlike what we commonly know as Chalk in the South of 

 England; but it is not so unlike some of the hard Chalk of the 

 ]^orth of Ireland. In some cases the siliceous portions are dark, and 

 cannot be distinguished from ordinary Chalk-flints. The limestone 



