126° W.D. Lang—Cretuceous Polyzoa of the Family Idmoniide.. 
B. Ridges long (six or more times as long as broad) and often wavy. 
a. Four to six zocecia in the breadth of a ridge. ; 
Lopholepis Hagenowt, Sharpe, 1854: Quart. Journ. Geol. Soc., 
pl. v, fig. 7. 
Idmonea Hagenowi, Gregory, 1899: Brit. Mus. Cat. Cret. Bry., 
pl. viii, figs. la, 6. , 
b. Five to seven zocecia in the breadth of a ridge. 
Reptoclausa meandrina, de Loriol, 1868, Val. Arz.: Pal. Suisse, 
Sere 1V, pt-,2, pl. vi, ig. 1. 
SEMICLAUSA. 
J, Zoarium a flattened tube ; ; zocecium-bearing ridges arranged pinnately. 
ail Semiclausa alternata, W Orbigny, 1858: Bry. Cret., pl. 764% 
figs. 6-10. 
B.. Zoarium a tube, triangular i in cross-section ; zocecium-bearing ridges arranged in 
longitudinal rows. 
‘Semiclausa angulosa, d’Orbigny, 1853: Bry. Crét., pl. 764, | 
figs. 11-13. ; 
BricrisiIna. 
A. Depressions between the apertures circular; apertures about twelve to fifteen i in 
a.series ; reverse face occupies about half the zoarium. 
Bierisina Gaudryi, Pergens, 1890: Revision, pl. xiii, fig. 2 
B. Depressions between the apertures tear- “shaped ; apertures about eight i in a series ; 
' reverse face not so extensive as in B. Gaudryi. 
Reticulipora cultrata, d’Orbigny,: 1851, Bry, Crét., pl. ely 
figs. 6-10; 1853, Bry. Crét., pl. 768, figs. 11-15. 
SULCOCAYVA. 
_A. Apertures circular. 
J. Zoarium stronely fluted. 
a. Distance between apertures of the same series about one diameter of an 
aperture. Reverse face almost obliterated. 
Sulcocava sulcata, W@ Orbigny, 1853:. Bry. Crét., pl. 789, figs. 1-3. 
b. Distance between apertures of the same series less than one diameter of 
an aperture. Reverse face fairly developed. 
Suleocara costulata, Marsson, 1887, Bry. Rug.: Pal. Abh., 
vol. iv, pt. 1, pl. ii, fig. 1. 
II. Zoarium with slot- shaped depr essions between the apertures. 
Sulcocava cristata, Gregory, 1899: B.M. Cat. Cret. Bry., vol. i, 
p. 212, fig. 21. 
Sulcocava gracilis, Gregory, 1899: B.M. Cat. Cret. Bry., vol. i, 
p. 214, fig. 23. 
III. Zoarium with faint longitudinal depressions between the apertures. 
Laterocava “gracilis, d’Orbigny, 1853: Bry. Crét., pl. 789, 
figs. 17-20. 
B. sper tear-shaped. 
I. Apertures about eight in a series. 
Suleocava or istata, W Orbigny, 1853: Bry. Crét., pl. 789, figs. 4-8. 
Suleocava lacryma, ’ Orbigny, 1853; Bry. Crét. , pl. 789, ‘fies. 9-12. 
II. Apertures about twelve in a series. 
Laterocava rustica, d’Orbigny, 1853: Bry. Crét., pl. 789, 
figs. 13-16. d 
RETICRISINA. 
_A. Branches of zoarium form a regular, dense network, the meshes of which are 
hexagons or squares. 
Reticulipora ligeriensis, @’Orbigny, 1851: Bry. Crét., pl. 609, 
figs. 1-6. 
Reticntipora girondina, a’ Dee 1851: Bry. Crét., pl. 609, 
figs. 7-12. ; + 
