240 Dr. G. C. Wallich on the Extent and Causes of 



In accordance with the views advanced, the whole of the 

 Testaceous Proteina may be accordingly arranged as follows : — 



Species 2. 

 E. alveolata (Duj.). 

 Subspecies, E, Enchelys=D. Enchelys (Ehr.) 

 . ^ a^'^ ■=Trinema acinus {Y)\i].). 

 ^"•S rh ■&! ■^- ^(trgaritacea = Cyphoderia margaritacea 

 I (Schlumb.). 

 [ var.? E. baltica=Lagynis baltica (Schultze). 



<5j 



H 



Pi ^ S 



^|3 



«2 Ki <^' S 'P. r Species 1 



L 





S ;^ ::s ■< Cadium caudatum (Wall.). 

 § (2 cq L var. C. marinum (Bailey). 



Species 1. 

 D. proteiformis (Ehr.). 

 Subspecies 1. D. mitriformis (Wall.), 

 var. X. D. acuminata (Ehr.). 

 „ /3. D. spiralis (Leclerc). 

 „ y. D. pyriformis {Ferty). 

 „ S. D. lageniformis (Wall.). 

 Subspecies 2. D. globularis (Duj.). 



var. «. D. tuberculata (Wall.). 

 „ i3. D. aculeata (Ehr.). 

 „ y. D. corona (Wall.). 

 Subspecies 3. D. Arcella (Ehr.). 

 Subspecies 4. D. marsupiformis (Wall.), 

 var. a,. D. cassis (Wall.). 



Genus Difflugia (Leclerc). 

 Characters. Animal a testaceous Amoeban. Pseudopodia 

 cylindrical or digitate. Test chitinoid, or chitinoid with addi- 

 tion of mineral matter. 



Species 1. D. proteiformis. 

 Characters of test. Form of embryonic test subspherical, 

 from ^th to ^th of the diameter in one direction being trun- 

 cated and constituting the aperture. Form of mature test ex- 

 tremely variable. 



Subspecies 1. D. mitriformis (Wall.). 



Characters. Test mitre-shaped, more or less inflated at posterior 

 extremity, and without any fixed ratio between its length and breadth. 



Var. ». D. acuminata. Apex of test acuminate. 



Var. li. D. spiralis. Anterior third of test bent back upon its body, so 

 as to present a retort-shape*. 



Var. y. D. pyriformis. Shape varying from the pear- to the balloon- 

 shape. 



Var. 8. D. lageniformis. The same as the last, but with a lip everted 

 in varying degrees. The most highly developed variety of this 

 form, and one that might pass for the archetype of the Roman 

 amphora. 



* It is somewhat of a misnomer to call this form spiral ; 

 stated, the turn does not extend further than that of a retort. 



already 



