Tenants of a Fossil Echinus. 



255 



amorphous silica which covered it. Unfortunately, through 

 neglecting to have the slide containing the specimen just 

 referred to, flat instead of resting on its edge, the slide was 

 spoilt, and the specimen lost. Then there is another obscure 

 specimen that I am inclined to think may prove to be a 

 PoUjcystina, Soon after I had noticed this example in slide 

 No. 21, my attention was called by the Editor to a note in 

 Ann. & Mag. Nat. Hist, for July, 1883, from the pen of Dr. 

 Wallich, who had discovered three, if not four, genera of 

 PoUjcystina in a flint from Surrey. Anyhow, I regard it as a 

 Polycystina until it be successfully disputed. Single valves of 

 two species of Entomostraca were among the finds in this prolific 

 Echinus. Then again, coccospheres and coccoliths were in great 

 abundance, but they are so very minute as to render them 

 unpopular for general inspection. 



The coccospheres are small round sarcodic bodies, and cocco- 

 liths are minute oval discs that are sometimes seen attached to 

 coccospheres, but they are much more commonly seen separately. 

 Messrs. Sorby, Huxley, Wallich, and others have studied them, 

 but they have not yet agreed in defining them, and so we must 

 wait until more is known about them. 



List of Tenants in the Fossil Echinus. 



Foraminifera. 



Textularia agglutinans, D'Orb. 

 ,, baudoidavay D'Orb. 

 ,, globosa, Ehr. 

 ,, sayittula, Defr. 

 ,, trochus, D'Orb. 

 ,, turris, D'Orb. 

 5 spp. 

 Bigenerina capreolus, D'Orb. 

 Spiroplecta biformis, P. & J. 



,, rosula, Ehr. 

 VeiJicidlina triquetra, Munst. 

 Bulimina presli, Rss. 

 Bolivina, several spp. 

 Lagena apiculata, Ess. 

 ,, globosa, Mont. 

 ,, sulcata, W. & J. 

 Dentalina, several fragments 



only. 

 Frondiculana cordai. Ess. 

 „ sp. ? 



Vaginulina legumen, Linn. 

 Cristellaria crepidula, F. & M. 



,, cultrata, Montf. 



,, rotulata, Lam. 



„ variabilis, Ess. 



2 spp. 

 Polymorphina, 2 spp. 

 Globigerina cretacea, D'Orb. 



,, bulloides, D'Orb. 



„ linneana, D'Orb. 



,, marginalis. Ess. 



Sphceroidina bulloides, D'Orb. 

 Discorbina, sp. ? 

 Truncatulina lobatula, W. & J. 

 ,, muellerstorji ? 



Schw. 

 Anomalina ammonoides, Rss. 

 Eamidina aculeata, D'Orb. 

 Rotalia, sp. ? 

 Nonionina, sp. ? 



