168 REPORT— 1883. 
epochs distinct. At the present time, and under present circumstances, I 
think the latter would he the wiser course to adopt, and then, when our 
British Polyzoa are better known, a closer alliance of types can be made. 
Hagenow describes only one species of Diastopora, D. disciformis, Hag. 
? Diasropora Sowrrsi, Lonsdale. Dixon’s ‘ Sussex.’ 
Tam rather doubtful about this species. I have the generally recog- 
nised form in my cabinet, and for the present I allow the name to appear 
in this Report. 
Biserial Drastopora, Milne-Ed. 
=Mesenteripora, Blainy. ; Bidiastopora, D’Orb.: 3rd ‘ Brit. Assoc. Report.’ 
Mihi. 1882. 
DIASTOPORA RETICULATA (new sp. ?) 
Zoarium reticulate formed by narrow leaf-like bands, having a width 
of about 5% of an inch, and a breadth varying in thickness from about {5 
to 3\; of an inch; the leaf-like bands anastomose at irregular distances. 
Zoecia tubular, delicate, and arranged in pretty regular, transverse lines 
across the width of the band, both on the exterior and interior surfaces 
of the zoarium ; about twenty cells occupy one of these transverse lines ; 
the orifices of the rows of cells are turned slightly upwards, and the 
proximal parts are depressed, so as to form a kind of ridge-and-valley 
surface. Ocecia? 
Locality — Beachy Head, Hastings (Miss Jelly) ; and also in my own 
cabinet. 
T am unable, from the various works at my disposal, to identify 
this peculiar Cretaceous Polyzoon. The habit of the species is unlike 
any other biserial Diastopora known to me, both in the disposition of 
the zowcia and in the ribbon-like appearance of the zoarium. My own 
Specimen is rather large, measuring one inch in length, and about a 
half-inch in breadth, but the section of the bands, when examined in a 
line, with the narrow back-to-back arrangement of the cells, shows the 
same biserial character as in some of the leaf-like but free (not reticulate) 
bands of the Oolitic epoch. There is a very striking likeness in this 
species to Idmonea fenestrata, Busk (‘ Crag Polyzoa,’ p. 105, Pl. xv. fig. 6), 
but the branches of that species are said to be sub-trigonal, and often 
angular behind. In Miss Jelly’s collection it is named D. vamosa? 
Michelin. I cannot identify it as such. 
Family III. Horneripa, Smitt. 
= Crisinide (part), D’Orb.; Idmoneide, Busk, Crag. Polyzoa; ‘ Brit. 
Mus. Catalogue.’ (See Hincks.) 
‘Zocecia opening on one side only of a ramose zoarium, never adnate 
and repent.’—‘ Brit. Mar. Polyzoa,’ vol. i. p. 467. 
Family IV. Horneripa, Hincks. 
Genus Hornera, Lamouroux. 
Zoarium erect, ramose, sometimes reticulate. Zowcia tubular, opening 
on one side only of the branches, disposed in longitudinal series, the 
celluliferous surface often traversed by wavy anastomosing ridges. 
Oewcium a distinct chamber (not a mere irregular inflation of the surface 
of the zoariwm), placed dorsally or in front. (‘Brit. Mar. Polyzoa,’ p. 467.) 
a 
