Poltjzoa of Mauritius. 79 



I'Egypte.' The vibracula are represented as two apparently 

 solid knob-like processes, and there are no setie. 



The Mauritius specimen is remarkable for the length of 

 the seta?, which are in several instances more than twice the 

 length of the cell. Perhaps it would be more correct to speak 

 of the setfe as vibraculoid mandibles. 



Lepralia rnosaica, n. sp. (PI. VIII. fig. 6.) 



Zooecia in linear series, by the branching of which and 

 junction of adjacent cells an irregularly-shaped zoarium is 

 produced. Zcoecia large, ventricose, surface shining, marked 

 with a mosaic pattern, punctured ; along the mid-line of the 

 cell a longitudinal beaded line ; orifice quadrangular, con- 

 stricted above lower margin of the orifice by a projection on 

 each side. Avicularia none. Ooecia ? 



The zooecia are attached to the surface on which they grow 

 and to each other, when contiguous, by a fringe of membra- 

 nous processes, with a perforation at the base communicating 

 with the body of the cell. 



In one cell which had the misfortune to bridge over a 

 chasm the basal fringe of processes is strongly developed in 

 the endeavour of the zooecium to attach itself securely. 



Genus Phylactella. 

 Pliylactella columnaris^ n. sp. (PL VIII. fig. 8.) 



Zoarium incrusting. Zooecia large, ventricose, walls thick, 

 white, punctured ; orifice quadrangular, constricted on each 

 side about the middle; lower border slightly concave; round 

 the front and sides of the orifice a high peristome ; rising from 

 the body of the zooecium a tubular avicularium, with small 

 triangular mandible. Ooecia globose, punctured, below the 

 level of and embraced by lateral walls of peristome. 



The tubular avicularia in two instances rise from the front 

 of the peristome. On one cell two columnar avicularia rise 

 from the same base and diverge at an acute angle. 



Genus Smittia. 



Smittia tubula^ n. sp. (PI. X. fig. 6.) 



Zoarium incrusting. Zooecia hyaline, ventricose, slightly 

 verrucose, separated by raised lines ; primary orifice orbi- 

 cular, with one broad denticle ; peristome tall, tubular, with 

 six tall spines ; secondary orifice horizontal, notched ; a small 

 avicularium, with small rounded mandible on one side of 

 orifice. Ooecium globose, punctured. 



