CYPHODEEIA" AMPULLA. 75 



Kilda {Brown), Outer Hebrides ! (West) ; Inverness- 

 shire (West, Broion) ; Elginshire, Aberdeenshire, Perth- 

 shire, and Argyllshire [Brown) ; Forth area [Bvans) ; 

 Kirkcudbrightshire and Wigtownshire {Brown). 



Ireland. — Mayo and the islands off Clew Bay ; 

 Lough Corrib, Galway {West) ; King's County 

 ( Wright) ; "Wicklow ! {Soph.) ; Kerry. 



The presence of pheosomes and small crystalline 

 bodies in the plasma of this and other species of the 



a i 



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 gmo ooooo 



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Fia. 142. — Portions of tests of Cyphoderia ampulla, x 2000. 

 a b 



Pia. 143. — Portions of tests of tlie same, x 2000. 



genus has already been noted. The test of G. ampulla 

 has either a simple hemispherical fundus or the apex 

 may be mamillated; the two forms are frequently 

 found in association. The small discs of which the 

 test is composed range from 1'5 to 2'5 )u, (rarely 3 /a) 

 in diameter and from 1'5 to 2ju, in thickness; they 

 are arranged in various ways which may be grouped 

 as follows : — 



(1) The discs may be circular or oval touching one 

 another, the angular interstices being of a lighter or 

 darker colour ; the discs are arranged in either parallel 

 or alternating rows (figs. 140 a and b, 141 c) . 



(2) The discs have an hexagonal appearance and 



