156 
SEMICLArSA. 
dimidiata, von Hagenow, 1851. Op. cit. p. 25. 
duplicata ,, 
polytreta ,, 
teres ,, 
tetragona ,, 
j j 
1851. 
Hid. p. 25. 
1850. 
Op. cit. p. 238. 
1851. 
„ p. 25. 
1850. 
„ p. 238. 
1851. 
„ p. 25. 
1850. 
„ p. 238. 
1851. 
„ p. 25. 
? SEMICLAUSA, d’Orbigny, 1853. 
Diagnosis. 
Idmoniidae vrith a compound tubular zoarium, with the series of 
apertures on longitudinal or pinnate ridges. Zooecial characters as 
in Idmonea. 
Type Species. 
Semiclausa alternata, d’Orbigny, 1853. 
U:yilEPRESEXTED SPECIES. 
1. alternata, d’Orbigny, 1853. 
Syx. Semiclausa alternata, d’Orbigny, 1853-4. Bry. Cret. p. 886, pi. 764, 
figs. 6-10. 
,, ,, Pergens, 1890. Revision, p. 341. 
Char. — Ridges pinnate and alternate ; each ridge is wedge-shaped, with the 
apertures in alternate series up to five or six in number. 
Distrib. — Neocomian: Sainte Croix, Switzerland. 
2. angulosa, d’Orbigny, 1853. 
Syn. Semiclausa angulosa, d’Orbigny, 1853-4. Bry. Cret. p. 886, pi. 764, 
figs. 11-13. 
,, ,, Pergens, 1890. Revision, p. 341. 
Char. — Zoarium a trigonal tube, with the zoarial ridges at the angles. 
Apertures in rows of five to six. 
Distrib. — Senonian or Turonian : Vendome, Loir-et-Cher. 
PHALANGELLA, Gray, 1848. 
Synonyms. 
Phalangella, Gray (1848), noti Hamm (1887). 
Tubulipora, pars, Lamarck (1816), non Lamouroux (1821), Busk (1875), 
Hincks (1879), etc. 
Per enicea, pars, Novak (1877). 
