for the Microscope. 91 



in Kentish chalk. Shell thin; divisions of the chambers 

 straight. (PL IX., fig. 12.) 



712. SMOOTH ROTALIA (Rotalia Micheliniana). With 

 a Nautilus form, obliquely divided into chambers. Found 

 in chalk. 



713. LOBED ROTALINA (Rotalitia Lorneriana). Three 

 kinds of Rotalina are found in Gravesend chalk, of which 

 this is one. It is a beautiful and very characteristic 

 form, having the chambers spirally arranged and lobulate. 

 (PL IX., fig. 10.) 



714. CLEMENT'S ROTALINA (Rotalina Clementiand). 

 An elegant form, with teat-like projections at the inner 

 angle of each chamber. 



Other forms of Foraminifera are found in British chalk, 

 which we cannot figure and describe within the limits of 

 the present work. 



Recent forms of Foraminifera are also plentiful in salt 

 water, not only around our own coasts, but all the world 

 over. 



715. FLASK SHELLS (Lagena vulgaris). Shaped like a 

 flask with a long neck, and a rim around the mouth ; 

 smooth and transparent, acquiring a bluish-white tint with 

 age. It has been collected at Whitehaven, Swansea, 

 Scarborough, &c. (PL IX., fig. 14.) 



716. GLOBOSE SHELL (Entosolenia globosd). Nearly of 

 an egg shape and smooth, slightly projecting at one ex- 

 tremity, at which is the opening. Found at Exmouth, 

 Southport, Swansea, Scarborough, and other localities. 

 (PL IX., fig. 15.) 



717. MARGINED ENTOSOLENIA (Entosolenia marginatd). 

 The commonest of British species. Nearly spherical, 

 with a marginal ridge ; opaque, and of a dirty-white 

 colour ; transparent when young. Found at Portsmouth 

 and other localities. 



718. TOOTH SHELLS (Dentalina sularcuata and Denta* 

 Una legumeii). These two species are not uncommon, 

 and are very variable in form, especially the former. 

 They occur on the south coast of England, and around 

 the Scotch islands. 



