PETALOPOKA. 
373 
not caTities in the walls of single zooecia (cf. Heteropora conifera^ 
figcl. Cat. Jni\ Biy. p. 205, fig. 19<?). 
That the pores in Petalopora end off abruptly within the walls is 
shown in a figiu’e by Pocta, reproduced as Fig. 46. A longitudinal 
section of Sparsicavea carantina (Fig. 49) shows similar mural 
maculae. Sparsicavea is accordingly also included in the Petalo- 
poiidae. 
Fig. 46. — TeUdopora contata (Orb.). Section through Wall with maculoe. 
(After Pocta.) 
The familj’ includes a small part of d’Orbigny’s Caveidae, a name 
unsuitable, owing, among other reasons, to its similarity to Cavidae. 
Genus PETALOPORA, Lonsdale, 1850. 
[Dixon, Geol. Sussex, p. 285.] 
Stnonyjjs. 
Chrysaora, pars, Romer, 1840. 
Zonopora, pars, d’Orhigny, 1850. 
Heteropora, pars, von Hagenow, 1851 ; Pergens, 1896, etc. 
Cavea, d’Orbigny, 1854. 
Clavicavea, d’Orbigny, 1854. 
Entalophora, pars, d’Orbigny, 1850. 
Canaiipora, pars, von Hagenow, 1851. 
Diagnosis. 
Petaloporidae with cylindrical or slightly compressed branches. 
The branches are usually ornamented by longitudinal, parallel 
