58 MICROSCOPICAL OBJECTS FOUND 



also contains numerous spines and other portions 

 of Echinodermata, many beautiful Cytherse, and 

 some fragments of shell textures, amongst which 

 Dr. Carpenter pointed out to me a fragment 

 of one of the perforated Terebratulse. Here 

 we have the elements of a mixed stratum, 

 where all the atoms of calcareous matter were 

 once living organisms, and those chiefly mi- 

 nute Foraminifcra, but where the siliceous 

 portion is entirely inorganic, unmixed, to any 

 material extent, with either siliceous Infusoria 



expressive generic term — Endosolenia. After the examination 

 of a vast number of specimens, I find that Lagena marginata 

 and L. squamosa belong to the same genus, exhibiting a similar 

 internal sheath, whilst L. Isevis and probably L. retorta belong 

 to the same group as L. striata — Ehrenberg's Miliola Ficus — 

 having a long external neck or tube. It is to the internal 

 sheath of Endosolenia that allusion was made hi page 35, as 

 constituting an apparent exception to the general rule in the 

 structure of the Foraminifera. Lagena squamosa (Vermiculum 

 squamosum Mont.*) is, I have no doubt, identical with the L. 

 reticulata of Mr. McGillivray ;f when viewed under the mi- 

 croscope, a little out of focus, the reticulations exhibit all the 

 squamous appearance represented in Montagu's figure — an 

 effect that would be sure to be produced by the imperfect 

 instruments of that age. 



* Montagu's Testacea Britannica. Table 14, fig. 

 t Shells of Aberdeen. 



