FOEAMINIFERA FROM RIVER MERSEY. 57 



provided with a prolongation ; the chambers being placed 

 in a winding series on five opposing faces. The first, 

 circular and compressed, forms a complete whorl ; the 

 others occupy a portion of the whorl, rolling themselves 

 round with age, so that it appears that there are five cham- 

 bers with a simple cavity. Mouth armed with teeth, as 

 in other Agathisteques, and in adults alternately at one or 

 the other extremity of the longitudinal axis." 



Oplitlialmklium incoiistans, Br. Here again it would seem 

 as if the ground was adapted for the growth of this species, 

 many having been found here. 



Haplophragmium canariense, d'Orb. Found in abundance 

 in this mud. 



Ainmodiscus gordiaUs, J. and P. Of this only one speci- 

 men was found. In appearance it is flattened, and like 

 an unwound Trochammina squamata, without septation. 

 On the suggestion of Mr. J. D. Siddall I have placed it 

 under the above heading. 



Trochammina, P. and J. Of this four forms were found, 

 and though marked rather rare, compared with many 

 gatherings, the rather rare might be called frequent in the 

 amount of material to be examined ; several of the variety 

 macrescens consisted of but very few chambers. 



Textidai'ia, Defrance. The few specimens found here 

 named T. aggluthians are very small, and might, in some 

 gatherings, but for the earlier chambers, have been mis- 

 taken for T. Jiliformis. 



BuUmina, d'Orb. Of the five species of the above that 

 were found, B. elegant'issima was the most frequent, except 

 the ever present B. pupoides. 



Lagena, Walker and Boys. Seventeen species or 

 varieties of this genus would seem to show that this 



