280 HENHY B. BRADY. 



connecting link between the fully developed form and 

 Williamson's Spirillina maryaritifera} hence the description 

 furnished to my friend Mr. Siddall [Joe. cit.) needs a little 

 revision. In the specimens from our own shores the tuber- 

 cular exostoses are frequently confined to the central portion 

 of the test, which is otherwise a flat or slightly concave disc, 

 bearing no indication of the spiral internal structure. 



Well-marked individuals of this species are found in tv/o 

 of the dredgings off Kerguelen Islands, namely, in Royal 

 Sound, 20 to 60 fathoms, and oif Christmas Harbour, ISO 

 fathoms. 



Ge«e^5— CHILOSTOMELLA, Beuss. 



Chilostomella ovoidea, Reuss. PI. VIII, figs. 11, 12. 



Chilostomella ovoidea, Eeuss, 1S49. ' Denkschr. d. math.-nat. CI. k. Akad. 



d. Wiss.,' vol. i, p. 380, pi. 48, fig. 12. 

 — Czjzeki, id. ibid., pi. 48, fig. 13. 



The genus Chilostomella has until quite recently remained 

 almost unknown to English Rhizopodists. It has never been 

 found amongst the fossils of our microzoic deposits, and 

 before its discovery by the Rev. A. M. Norman," in sands 

 dredged off Valentia (112 fathoms), and amongst material 

 brought by the scientific staff of the " Valorous " from the 

 far north, its range of distribution Avas supposed to be limited 

 to certain Tertiary marls of Central Europe. It is never- 

 theless to be regarded as a locally or partially distributed 

 rather than as a very rare recent type, for it occurs in con- 

 siderable abundance in many areas far apart, and the wonder 

 is that it remained so long unobserved. 



The structural features of Chilostomella and its near ally 

 Allo7nor2}hina, are so remarkable that Reuss very properly 

 placed the two genera in a family by themselves, which he 

 characterised as follows {loc. cit.) : 



" Enallostegia cryptostegia. — Testa libera, irregularis, 

 insequilatera, conflata e loculis perfecte amplectentibus, 

 alternantibus, ad axes vel duos oppositos vel tres in triangulo 

 positos. Contextura testae vitrca, pellucida, nitens." 



Seguenza's interesting genus Ellipsoiditia is, I am con- 

 vinced, very nearly related to the types included by Reuss in 

 this family ; and the descriptive characters above quoted 

 would need but little modification to admit a form which 

 differs chiefly from Chilostomella in the segments springing 



' 'Rec. Forani. Gt. Br.,' p. 93, pi. 7, fig. 204. 

 - 'Proc. Roy. Soc.,' vol. xxv, p. 214. 



