MB. A. "W. WATERS ON MEMBEANIPOEID^. 693 



Fig. 18. Membranipora armifera, Hincks. From the Gulf of St. Lawrence. 

 X25. 



19. Membranipora maderensis, sp. nov. Showing vicarious aviculariiim. 



X 25. 



20. Membranipora corbula, Hincks. Do, X 25. 



Plate 49. 



Fig. 1. Membranipora bidens (Hag.). From Capri. X 25. 



2. Membranipora sceletos, Busk. X 85. 



3, 4. Do. Spinous plates by the side of the oral aperture. X 85. 



5. Do. Frontal spine seen from the side. X 85. 



6. Do. Mandible. X 85. 



7. Flabellaris roborata (Hincks). Section showing the position of the 



ovarium (o) and of the cellular masses (cm.). X 85. 



8. Do. Cellular masses and the parenchym-threads attached to these 



passing through a rosette-plate (r.p.'), and also attached to the walls 

 of the stomach. X 500. 



9. Do. Distal rosette-plate. X 85. 



10. Do. Ovarium. X 500. 



11. Membranipora bursaria, MacG-., var. phillipensis. X 85. 



12. Membra7iipora fltistroides, Hincks. Mandible. X 85. 



13. Membranipora pyrula, Hincks. Mandible. X 85. 



14. Membranipora californiensis, sp.^oy. x85. 



15. Membranipora hians, Hincks. Distal rosette-plate. X 25. 



16. Do. Lateral rosette-plate. X 25. 



17. Membranipora Tnembranacea, L. Showing breaks in the side wall.. 



X25. 



18. Membranip>ora tripunctata, Waters. X 85. 



JjTKS. JOUEN. ZOOLOGY, VOL. XXVI. 49 



