PEOBOSCI^'A. 
49 
Zooecia short and cro’^ded. The peristomes are slightly 
raised. The apertures are quincuncial or linear ii;i arrange- 
ment, and usually in regular transverse rows. 
DlilEXSIOXS. 
Distance of apertures 
Diameter of zooecia 
Diameter of apertures 
B.M., D. 2300. 
•4 mm. 
•2 „ 
•13 „ 
DlSTErBUTION. 
England ; 
Upper Chalk : Gravesend. 
Middle Chalk : Chatham. 
Foreign : 
Senonian — Maastrichtian : Maastricht ; Meudon, near Paris ; Fecamp, 
Seine-Inferieure. 
Santonian: Djehel Sidi-hou-Ghanem, Tunis ; St. Paterne, 
Loir-et-Cher ; Saintes, Perignac, Pons, etc., Charente- 
Inferieure. 
Coniacian: Tours, Indre-et-Loire. 
Turonian : Angouleme and Merpins, Charente; Ste. Maure, Indre- 
et-Loire ; Les Roches, Lavardin, etc., Loir-et-Cher ; 
Nefgrahen, Gosau. 
Arrialoor Series: Poodoopolliam, S. India. 
Cenomanian : SchiUinge, Bohemia ; Saxony, in Lower Planer. 
Fiqtjee. 
PI. III. Fig. 5. Part of a zoarium, X 15 dia. Upper Chalk: 
? Gravesend. Presented by F. Harford, Esq. D. 2300. 
Afpinities. 
This ‘ species ’ is most nearly allied to Prohoscina fasciculata, var. 
toucasiy P. sarthacensisy and P. cornucopice. It agrees with them 
in the size and general characters of the zoarium ; hut it differs 
from them all by the regular quincuncial arrangement of the 
apertures. In this respect it approaches Idmonea, to which 
(under its synonym of Reptotuhig era) this species is referred by 
Pergens. But it seems to me more natural to regard this species 
as only a Prohoscina with linear peristomes than as an Idmonea : 
the zooecia are not in alternate series as in that genus : the general 
E 
