6 W. D. Lang — Oil Herpeiopora, a New Genus 



lateral buds, so that the normal mode of brandling is 'bilateral'; 

 no avicularia, but lieteromorpliic individuals may occur ; normal 

 zooecia consisting of a distal 'capitular' and a proximal 'caudal' 

 portion, though in young zoarial stages, as evidenced by recapitulation 

 at the branches, the caudal portion is very short or absent; front 

 wall divided by a plain, more or less oval rim, the ' termen ', into 

 an inner and outer portion — the intra-terminal and extra-terminal 

 front walls ; the former consists of a narrow, calcareous terminal 

 bevel, hardly wider proximally than distally, and (presumably) of 

 a chitinous portion not preserved in the fossil state ; extra-terminal 

 front wall entirely calcareous, plain, with no median proximal ridge 

 or groove. Sealed and renewed zooecia ytry common. 



J}^ofe. — Hippothoa, in which the two following species have hitherto 

 been placed, has a completely calcareous front wall. 



Genotype. — Serpetopora anglica, n.sp. 



Herpetopora anglica, n.sp. PL II, Figs. 1-3. 



Diagnosis. — Herpetopora with zooecia that taper somewhat distallj' 

 as well as proximally ; witli regularly elliptical termens and (in 

 ephebastic zocecia) with very long, straight caudal portions. Hetero- 

 morphic individuals of unknown function, but not avicularia, 

 occasionally occur. 



Note. — The distal tapering distinguishes H. anglica from pear- 

 shaped forms such as II. clavigera, n.sp., Hippothoa cruciata, E-euss,' 

 and H. gracilis, d'Orbigny,^ and the regularly elliptical termens and 

 straight caudal portions from H. lahiata, I^ovak,^ and II. desiderata, 

 Kovak.* Cellepora dispersa, von Hagenow,^ to which this form is 

 usually referred, is not even a Herpetopora. It has a beaded termen 

 and definite avicularia on the caudal portions of the zooecia ; it is 

 found iu the mucronata zone at Riigen. 



Type-specimen. — British Museum specimen D. 11359 ; Senonian, top 

 of zone of Micraster cortestudinarium or base of zone of II. coranguinum ; 

 Cliatham, Kent ; "W. Gamble Collection. 



Distribution. — Turonian, zone of Tereiratulina, to Senonian, zone 

 of Marsupites. Common in zone of Micrasfer cortestudinarium and 

 in lower part of zone of M. coranguinum. 



Herpetopora clavigera, n.sp. PL II, Figs. 4-5. 

 Diagnosis. — Herpetopora with zooeoia hardly tapering distally and 

 consequently more or less pear-shaped, luxving their outlines bounded 

 by steeply curved sides, more so than iu Hippothoa cruciata, Reuss,^ 



1 Reuss, Denk. d. KaiserL Akad. d. Wissensch. Wien, Bd. vii, p. 134, 

 pi. xxviii, fig. 1, 1854. 



'' D'Orbigny, PaUontologie Francaise; Terrains GrAtacis, vol. v, p. 386, 

 pi. 711, tigs. 9-11, 1852-3. It is very doubtful whether this form should be 

 placed here. 



^ Novak, Denk. d. KaiserL Akad. d. Wissensch. Wien, Bd. xxxvii, pt. ii, 

 p. 86, pi. iii, figs. 1-5, 1877. 



■* Novak, op. cit., p. 86, pi. ii, figs. 1, 2, 1877. 



^ Von Hagenow, 1839, Neues Jahrbuch f. Mm., etc., p. 280. For figure 

 see Marsson, Pal. Abhandl., Bd. iv, Hft. i, p. 91, pL ix, fig. 9, 1887. 



^ Reuss, loc. cit. 



