MEMBRANIPORIOE. 43 



under which L. ciliata occurs, will be found rather remote. But the transition from the 

 delicate, transparent fucicolous L. ciliata of the south coast, growing within the laminarian 

 zone, to the more robust, coarsely granular, thickened variety which occurs on shells from 

 deep water, is too well marked in a sufficient series of specimens to leave any room for 

 doubt as to the specific identity of the fossil and recent species. In specimens of the 

 latter, dredged by the late lamented W. Thompson in deep water, (45 fathoms) in Belfast 

 Bay, little or no difference can be perceived from the Crag fossil. 



G. L. MORRISIANA (. Sp.) PI. VII, fig. 8. 



Cellulis ovatis, umbonatis, superficie raro punctatis, aviculario parvo utrinque armatis. 

 Orificio semicirculari, supra spinis 6 marginalibus armato, labro inferiori recto. Ovi- 

 cellula resupinata, ostio patulo, peristomate incrassato. 



Cells quincuncial, ovate ; surface sparsely punctured ; orifice semicircular, with a 

 straight border below ; 6 marginal spines above ; a small umbo in front of the cell above 

 the middle ; a small avicularium on each side of the cell in front. Ovicell resupinate, 

 its opening gaping with a thickened border. 



CELLEPORA TRISTOMA (?), Goldfuss, Pet. Germ., p. 102, pi. xxxvi, fig. 12 (no oral spines), 

 occurs on Terelratula grandis at Anspruch. 



Habitat. C. Crag on Terebral. grandis, S. Wood. J. S. B. 



From the appearance of the minute rounded openings on the so-termed avicularian 

 processes it is possible they may have supported vibracula like those of L. Hyndmanni. 



(b) Without oral spines. 

 7. C. VIOLACEA, Johnston. PI. IV, fig. 3. 



Cellulis elongatis, subpyriformibus, marginem circa, subinde etiam per totain superficiem, 

 punctatis, avicularium centrale, mandibulo sursum spectante, gerentibus ; infra avicularium, 

 foramen margine declivo ostenclentibus. Orificio semicirculari, labio inferiori recto. 



Cells elongated, subpyriform, punctured round the margin and sometimes over the 

 whole surface; a central avicularium, the mandible pointing directly upwards; below the 

 avicularium a central depressed perforation. Orifice semicircular, straight below. 



L. VIOLACEA, Johnst., B. Zooph., 2 ed., p. 325, pi. Ivii, fig. 9. Busk, B. M. Cat. part ii, 



p. 69, pi. Ixxxvii, figs. 1, 2. 

 ESCHAEELLA VIOLACEA, Gray. 



