Polyzod from, tJtc (rllhcii /shnn/s 411 



Catenaria infundibuliformis, n. sp. (PI. XXV]., Fiu i). 



Zourium free. Zooecia tubular below, expanded and ventricose 

 above ; surface punctate with a smooth longitudinal band on the 

 dorsal surface ; distal end smooth, surmounted by 4 to 6 spines 

 and two umbonate projections. Thyrostome orbicular ; oper- 

 culum opening upwards. 



The specimens are entangled in a mass of sponge threads and 

 are composed of single disconnected zooecia, so that the mode of 

 branching does not appear ; " a " and '" b " are side views of two 

 different specimens; "c" and " d," front views of two others; 

 " d '' showing the opercuhiiu. 



Scpupocellaria gilbertensis, n. sp. (Plate XXVI., Fig. 2). 



Zooecia (i to 1 (J in an intcitiodf, elongated. TliyiDsronie 

 arched above, straight below ; surrounded by an elevated ellip- 

 tical area, m the lower portion of which is a slightly raised cres- 

 centic punctate area. Scutum suborbicular with rounded boss. 

 Three to five spines above the thyrostome. Lateral avicularia 

 large, pointing outwards and upwards, with a ligulate mandil)le. 



On the front of the zooecia, below the elevated area there is a 

 small umbonate process, probably avicularian, but the specimen 

 is small, somewhat imperfect and much covered with small grains 

 of sand, etc., so that it is difficult to make out the details, but 

 sufficient are visible to show it is a good species. 



Meg-apopa gilbertensis, n. sp. (Pl.itc XXVf, Kig. .S). 



Zoarium encrusting. Zooecia oval, with raised margins. Thy- 

 rostome arched above, straight below, with a chitinous rib sepa- 

 rating it from the proximal membranous flap ; a crenulated 

 ridge extending from each side of the thyrostome in a curve to 

 the margins, thence downwards to the base enclosing a grami- 

 lated, slightly depressed area in which are two large subcircular 

 perforat ons (opesia), in some cases covered with an epitheca. 



This specimen is growing upon a small red coral ; it much 

 resembles in appearance Micopora coriacea, owing to the pre- 

 sence of the two large perforations in the front wall, but the 

 peculiar thyrostome with a raised ridge separating the upper 



