EETECATA. 
205' 
LIST OF SPECTMEXS. 
D. 4497. A zoarium showing transverse sections of distal ends of the branches. 
Maastrichter Ivreide. iSlaastricht. Van Breda Coll. Fig. No. 18^ 
p. 204. 
D. 3232. Two Avell- preserved zoaria, one of Avhich is umbrella -shaped, the 
radial branches being raised on a cyliudidcal stem 2-5 mm. in 
height. Maastrichter Kreide. Maastricht. Yan Breda Coll. 
D. 3286. Seven zoaria (in tube). Maastrichter Kreide. Maastricht. Van 
Breda Coll. 
D. 3285. Six zoaria (in tube). Maastrichter Kreide. Maastricht. Yan Breda 
Coll. 
D. 3519. The central portion of a zoarium (on slide). Maastrichter Kreide. 
Maastricht. Yan Breda Coll. 
D. 3551. Two zoaria (in tube). Maastrichter Kreide. Maastricht. Yan 
Breda Coll. 
D. 3577. A zoarium (in tube). Maastrichter Kreide. Maastricht. Yan 
Breda Coll. 
D. 6430. Eight fragments (on slide). Maastrichter Kreide. Maastricht.. 
Busk Coll. 
TJXEEPRE8EXTED AXD DOUBTFUL SPECIES. 
1. abbotti (Gabb & Horn), 1860. 
Sy.\. Heterocrmna abhotti, Gabb & Horn, 1860. Joiiru. Acad. Nat. Sci. PhiL 
ser. 2, vol. iv. p. 404, pi. Ixix. figs. 45-7. 
Bicrisina ,, Gabb & Horn, 1862. Foss. Polyz. N. Amer. : ibid. 
ser. 2, vol. v. p. 174, pi. xxi. fig. 65. 
Ch.xr. — Z oarium of subquadrate branches, with the apertures in lateral transverse 
rows of four in each. Eeverse side large and convex. Innermost apertures 
much larger than the rest. 
Afe. — X early allied to Retecava cretacea (Eclw.), but distinguished 
by the greater difference in size between the innermost and 
remaining apertures. 
2. areolata, Marsson, 1887. 
Syn. Eetecava areolata, Marsson, 1887. Bry. Biig. : Pal. Abb. vol. iv. p. 36,. 
pi. iii. fig. 9. 
Char. — Zoarium of thick branches with a strong median lamella, and the- 
lateral series of apertures at right angles to the median series, and not passing* 
off in oblique, curved series. The series are somewhat irregular. The lateral 
series include from four to six apertures. 
Distrib. — Senonian : Eiigen. 
