SCHIZOPORELLA HYALINA. 271 



rich colour, which is tolerably preserved in dead speci- 

 mens, is a good specific mark. 



The orifice in young cells is slightly sinuated in front ; 

 and this character allies the species to the present group; 

 but it is singularly destitute of striking structural features. 



SCHIZOFORELLA HYALINA, LinnSBUS. 

 Plate XVIII. figs. 8-10. 



CELLEPORA HYALINA, Linn. Syat. ed. 12, 1286 : Fobr. Faun. Groenl. 435. 



CKLLEPORA NITIDA, Fdbr. Faun. Groenl. 435. 



CELLEPORA PERSONATA, D. Chiaje, Ann. S. Vert., Mem. iii. 39, pi. rmv. 



figs. 17, 18 (ovicell). 

 ESCHARINA PERSON AT A, M.-Edwards, in Lamk. An. e. V. ed. 2, ii. 236, 



no. 24. 



BERENICEA IIYALINA, Hass. Ann. N. H. vii. 367. 



LEPRAL-A CYLINDRICA, Hass. Ann. N. H. vii. 368, pi. ix. fig. 6 (opaque var.). 

 LEPRALIA HYALINA, W. Thompson, Ann. N. H. v. 253 : Johnston, B. Z. ed. 2, 



301, pi. liv. fig. 1: Busk, B.M. Oat. ii. 84, pi. Ixxxii. 



figs. 1-3, pi. xcv. figa, 3-5, pi. ci. figs. 1, 2. 

 ?CBLLEPORA OVOIDKA, Lamx. Pol. Corall. flex. 89, pi. L fig .1 ; Eip. Moth. 2, 



pL Ixiv. figs. 4, 5. 



CELLEPORELLA HYALINA, Gray, B.M. Bad. 128. 

 MOLLIA HYALINA, forma HYALINA auctt., Smitt, loc. cit., Krit. Fort. iv. 16 and 



109, pi. xxv. figs. 84, 85. 



Zoopcia elongate-ovate or subcylindrical, horizontal, di- 

 stinct, occasionally subcarinate, disposed somewhat 

 irregularly in radiating rows often separated by punc- 

 tured spaces ; walls very thin and hyaline ; surface 

 smooth and shining, or slightly furrowed transversely ; 

 orifice terminal, orbicular, frequently with a deep 

 sinus in front; peristome thin, the upper margin 

 raised. Ooecia globose, prominent, punctured, often 

 rising into a boss in front; fertile cells small and 

 partially aborted, produced chiefly in the central por- 

 tions of the colony, and developed upon the primitive 

 layer of cells. 



Polypi de with 12 tentacles. 



