252 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



PLATE 27 



Fig. 1. Membraniporella crassicosta Hincks, usual appearance with 

 heavy spines little developed upward. 



Fig. 2. The same, a zooeciura near the center of the zoarium, with 

 the spines united above the opesia. 



Fig. 3. Membraniporella aragoi var. pacifica new variety. 



Fig. 4. The same, showing ovicell and the fully developed lateral 

 oral spines. 



Fig. 5. Membraniporella pulchra new species. 



Fig. 6. The same, with ovicell. 



Fig. 7. Lyrula hippocrepis (Hincks), normal appearance with large 

 vicarious avicularium. 



Fig. 8. The same, old stage of calcification. 



