P()li/Z(>(l ffoii) thi' (iillirrf Islands. 4\'A 



siiuilar structure to that of Uie other species of the <renus. The 

 proximal niarjxin of the opening in the crvptocyst is very irre- 

 guhir in form, hut in every case the protruding portion shows an 

 incurved ])art in the middle, which I consider represents an 

 imperfectly develojjed " tube.'' The zooecia are very much 

 smaller than those of any other species, and the surface of the 

 cryptocyst is granulated, not perforated. There is no trace of 

 the membranous front wall in the specimen. 



Cribpilina gilbertensis, n. sp. (PI. XXVT., Fig. 6). 



Zoarium encrusting. Zooecia oval, ventricose, with 8 to 12 

 tiansverse rows of minute globular elevations. Thyrostome 

 arched above, straight below, surrounded with a raised margin 

 bearing seven long spines. On each side of the thyrostome 

 there is a very long acute avicularium placed slightly above it, 

 extending and opening directly upwards. 



This species resembles C. radiuta, but has not the central 

 pore below the thyrostome of that species, and it has very long 

 aviculariu. It is a very delicate form, and has a glassy-like 

 appearance. In the specimen from which the figure is drawn 

 only the bases of the spines round the thryrostome are present, 

 but in another specimen, which otherwise is somewhat imperfect, 

 they arc shown as delicate spines almost as long as the avicuhiria. 



Lepralia trispinosa, u. sp. (PI. XX\i., Fig. 7). 



Zoarium encrusting. Zooecia oval or pyriform, ventricose; 

 surface slightly granulated. Thyrostome arched above, straight 

 below, with three long spines al)ove. An acute avicularium 

 with a slightly curved mandible on the proximal maigin of the 

 thyrostome. 



A small, delicate species. The three long spines and the oral 

 avicularium distinguish this species from others. 



Hiantopora cornlculata, n. sp. (Plate X.\\l.. I'ig. S). 



Zoarium encrusting. Zooecia totally immersed and unde- 

 fined ; surface rugose, with irregularly shaped perforations. 

 Long ligulate avicularia scattered alioul, and also some small, 



