Foraminifera of the River Dee. 



41 



in the "test," especially in the representatives of the Milioline 

 genera, its place being supplied by the " chitinous " or reddish- 

 brown horny-looking substance which seems to form the base 

 of the shell in all the MilioUnoe. 



It is interesting to compare the Rhizopodal fauna of these 

 two western estuaries, the Clyde and the Dee. Of the total 

 number of forms met with, sixty-nine are common to both 

 rivers ; seventeen species are found in tlie Clyde which have 

 not been found in the Dee, and, on the other hand, thirty-two 

 have been found in the last-mentioned river which do not 

 appear in Mr. Robertson's catalogue, as follows : — 



Foraminifera found in the Firth of 

 Clyde 7wt occurriny in the estuary 

 of the Dee. 



Coruuspira foliacea. 

 Triloculina Bronjyniartii. 



Spiroloculina excavata. 

 Litnola nautiloidea. 

 Valvulina austriaca. 

 Lagena distonia. 



lagenoides. 



hexagona. 



Jeffreysii. 



striato-piinctata. 



Nodosaria pjTula. 

 Uentalina pauperata. 

 Vatrinuliiia legumen. 



Polymorphina tubulosa. 



Bulimina aculeata. 



Tinoporu8 lucidus. 

 Polystomella arctica. 



Fm-aminifera found in the estuary 

 of the Dee not occurring in the 

 Firth of Clyde. 



Cornuspira involvens. 



Quinqueloculina Candeina. 

 pulchella. 



Lituola fusiformis. 



Lagena striata, var. gracilis. 



ornata. 



lucida. 



aspera. 



Nodosaria radicula. 

 Dentalina guttifera. 



Marginulina raphanus. 



glabra. 



Polymorphina oblonga. 



Thouini. 



fusiformis. 



concava. 



gibba, var. sequalis. 



Uvigerina angulosa. 



pygmaea. 



Textularia pygmaea. 



difformis. 



agglutinans. 



Vemeuilina spinulosa. 

 Bulimina elegantissima. 

 Bigenerina digitata. 

 Spirillina margaritifera. 



vivipara. 



Cassidulina laevigata. 



Truncatulina refulgens. 

 Pulvinulina auricula. 

 rcpanda. 



Nonioninn umbilical ula. 



