64 EXPLANATION OF PLATE 44. 



Fig. 3. Lituite in the Transition lime-stone of Oeland. 



a. Siphuncle of Lituite. (Original.) 



' Fig. 4. Section of an Orthoceratite in the Transition 

 limestone of Oeland, in the collection of C. Stokes, 

 Esq. (Original.) 



a. Siphuncle of the same. 



Fig, 5. Baculite, from Chalk of the Cotentin ; terminating 

 at its large end in the chamber a. (Original.) 



Fig. 5. b. Front view of the transverse plate of a Bacu- 

 lite, showing the margin to be disposed in lobes and 

 saddles, and the place of the Siphuncle to be on the 

 back of the shell at c. (Original.) 



Fig. 6. Transverse section of a Nummulite. (Parkinson, 

 V. 3. PL X. Fig. 16.) 



Fig. 7. Longitudinal section of another Nummulite.* 

 (Parkinson.) 



one specimen the Eye is preserved, and is very large in proportion to 

 the body. These Mollusks form the prey of the Physali, and were 

 caught entangled in their Tentacula. 



L'Echo du Monde Savant, 1 Mai, 1836. 



* Among the microscopic fossil shells placed by D'Orbiguy in the 

 same Order as Nummulites (Foraminiferes), Count Munster enu- 

 merates 40 species from the Cretaceous free stone of Maestricht. Mr. 

 Lonsdale also has discovered 16 species of microscropic foraminifers 

 in the English Chalk. (See V. I. p. 337, Note.) Microscopic shells 

 of this Order occur in countless myriads throughout the Tertiary strata. 

 (See V. I. p. 290.) 



The Sand of the Shores of the Adriatic, and many Islands in the 

 Archipelago, is crowded with recent microscopic shells of the same 

 kind. 



It is mentioned in our Note, V. I. p. 288. that doubts have arisen 

 as to the supposed origin of many of these minute multilocular shells 

 from Cephalopods. Some recent observations of M. Dujardin have 

 induced him to refer the Animals which construct the Miliola and 

 some other microscopic foraminiferous shells, to a new Class of 

 animals of a lower degree than the Radiata, and possessing a loco- 

 motive power by means of minute tentacular filaments. He proposes 

 to give them the name of Rhizopodes. Ann. des Sci. Nat. Mai, 1835. 

 p. 312. 



