OSCULIPOEA. 
59 
OsciiUpora truncata, d’Orbigny, 1853. Bry. Cret. p. 679. 
,, ,, Yon Eeuss, 1872-3. Bry. unt. Quad.: Paloeontogr. vol. xx. 
pt. i. p. 122, pi. XXX. figs. 2, 3. 
55 55 von Eeuss, 1874. Bry. ob. Plan. : vol. xx. pt. ii. p. 136. 
5 5 5 5 Ubaghs, 1879. Descr. Geol. Pal. Limb. p. 222. 
, 5 5 5 Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 33. 
5 5 5 5 pars, Marsson, 1887. Bry. Eiig. : Pal. Abb. vol. iv. p. 37. 
5, 5 5 Hennig, 1894. Bry. Sver. Krit. ii., Cycl. : Lunds 
Univ. Arsskrift, vol. xxx., Acta Physiogr. No. viii. p. 30. 
Truncatula ,, von Hagenow, 1851. Bry. maastr. Kr. p. 35, pi. iii. fig. 2. 
5 5 5 5 Kade, 1852. Los. Verst. Schanzenb. p. 31. 
5 5 5 5 pars, Winkler, 1864. Musee Teyl., Cat. Pal. livr. ii. p. 207. 
, 5 5 5 pars, Brauns, 1875. Sen. Salzbergs : Zeit. Ges. Naturw. 
vol. xlvi. p. 401. 
, 5 5 5 Vine, 1885. 5th Eeport : Eep. Brit. Assoc. 1884, p. 141. 
, 5 5 5 Pergens & Meunier, 1887. Bry. gar. Faxe : Ann. Soc. 
malac. Belg. vol. xxi., Hem. p. 222. 
Idmonea pinnata, Giebel, 1848. Polyp. PJauerm. : Zeit. Zool. Zoot. vol. i. p. 11. 
,, tetrasticha, von Hagenow, 1851. Bry. maastr. Kr. p. 34, pi. iii. fig. 3. 
Coslophyma Icevis, pars, von Hagenow, 1851. Ihid. p. 105, pi. ii. fig. 15. 
? ,, constrictum, von Hagenow, 1851. Ibid. p. 106, pi. ii. fig. 16. 
Truncatula semicijlindrica, pars. Boll, 1852. Geogr. Mekl. : Arch. Ver. Naturg. 
^[eklenb. vol. vi. p. 63. 
Diagnosis. 
Zoarium erect, simple or branching once or twice. The reverse 
face is well rounded and marked by longitudinal ribs. Peri- 
stomal fascicles highly raised and widely separated ; they are 
subcircular at their free end, and each usually contains about 
a dozen apertures, but may contain twenty-four. The peri- 
stomal fascicles stand up either as mammilliform prominences 
or as well-developed cylindrical processes, whicli are often 
subalternate. The obverse face is smooth, and has a deep 
median groove between the peristomal fascicles. 
Gonoecium ovoid, smooth, projecting conspicuously from the 
reverse side of the zoarium ; sometimes crossed by a con- 
striction. 
Dimensions. 
Length of zoarium 
mm. 
5 
Diameter of branch 
•6-1 
Diameter of aperture 
•07--1 
Diameter of peristomal fascicle ... 
•3--5 
Length of peristomal fascicle 
•3-1 
Distance between centres of adjacent fascicles ... 
•8 
Diameter of gonoecium ... 
1-2 X 1-3 
