298 General Ilistortf of the Marine Polyzoa. 



bifid denticle) a centi-al raucro, bearing on the top a minute 

 avicularmm, commonly two or thi*ee slender spinous processes 

 below it on the cell-wall, also aviculiferous ; at the top of the 

 cell on each side a rather stout, calcareous, cylindrical pro- 

 cess, with a minute avicularium on the summit ; on one side 

 of the orifice a very large raised avicularium, with spatulate 

 mandible directed obliquely downwards. Ooecium wider than 

 high, well rounded above, the sides slightly incurved and 

 prolonged below alongside the oral arch, which is wide and 

 shallow, the surface of a delicate silvery whiteness, covered 

 with extremely minute risings, closely packed together. 



Loc. Singapore or Philippines {Miss Jelly). 



The most remarkable characteristic of this species is the 

 profusion of the avicularia, and not only their profusion, but 

 their peculiar character. With the exception of the large 

 spatulate form, which occurs singly on a great proportion of 

 the cells, they are all minute in size and mounted on the top 

 of a calcareous column or erect spine-like process, and are 

 present in extraordinary abundance. 



EXPLANATION OF THE PLATES. 

 Plate VI. 



Fiy. 1. Fltistra spinuligera, sp. n. a. Segment of the zoarium, nat. size. 



b. Abnormal zooecium. c. Avicularium. d. Avicularium of 



Flustra denticulata, var. inermis, Busk *. 

 Fig. '2. Schizojwrella concinna, pp. n. a. Orifice and lateral avicularia. 

 Fig. 3. SchizoporeUa himunita, sp. n. a. Ooecial cells. 

 Fig, 4. SchizoporeUa scahra, sp. n. 

 Fig. 5. Flustrn nobilis, sp. n. a. Avicularia. h. Zocecium, showing the 



origin of tlie radical fibres at a. 

 Fig, 6. SchizoporeUa pectinata, Busk, form Africana, nov. 



Plate VII. 



Fig. 1. SchizoporeUa spectabilis, sp. n. a. Ooecium. 



Fig. 2. MucroneUa aviculifera, sp. n. 



Fig. 3. SchizoporeUa inconspicua, sp. n. 



Fig. 4. Lepralia oceUata, sp. n. a. Orifice. 



Fig. 5. Memh-anipora ehurnea, sp. n. 



Fig. 6. Lepralia hincifera, sp. n. a. Group of zooecia with ocBcium. 

 b. Ooecium, with penthouse-like projection in front. 



* After the figure in the ' Challenger ' Report, pi. xx-xii. fig. 2 c. 



