528 REPORT ON THE XENIIDAE COLLECTED BY DR ^VILLEY. 



LITERATURE. 



1848. Dana. United States Exploring Expedition, 1838—1842. Zoophytes. 1848. 



1877. Kluszinger, C. B. "Die Korallthiere des Rothen Meeres." Erster Theil. "Die 



Alcyonarien und Malacodermen." Berlin, 1877. 

 1895. Bourne, G. C. On the Structure and Affinities of Ueliopora coerulea, Pallas, with some 



Observations on the Structure of Xenia and Heteroxenia. Phil. Trans. 1895. 



1895. HiCKSON, S. J. The Anatomy of Alcyoniuin digitatum. Quart. Journ. Micr. Science. 



Vol. 37, Part 4, 1895. 



1896. ScHENK, A. " Cla\-ulariiden, Xeniiden, und Alcyoniiden von Ternate." Frankfurt a. M., 



1896. 

 1899. AsHWORTH, J. H. The Structure of Xenia Hicksoni nov. sp. with some Observations on 

 Ueterooxnia Elizabethae, Kolliker. Quart. Journ. Micr. Sci., Vol. 42, Part 3, 1899. 



EXPLANATION OF PLATES LII. AND LIIL 



List or Reference Letters. 



D. M. F. Dorsal mesenterial filament. Ed. Ectoderm. Ect. Ch. Chain or cylinder of 

 ectoderm cells surrounding the cylinder of denser mesogloea. Ect. Str. Strands of ectoderm 

 cells. End. Endoderm. End. Can. Endodermic canals. G. V. Germinal vesicle of ovum. 

 Gen. C. Genital cells in various stages of development. Lovxj. Can. Longitudinal endodermic 

 canal. My. Mesogloea. Mg. D. Denser cylinder of mesogloea around each coelenteron in the stem. 

 M. P. Muscle processes of endoderm cells. N. Nucleus. Ov. Ovum. Sp. Spicule. St. Stomodaeum. 

 Sup. Can. Superficial canal. S. S. Sperm sac. F. M. Ventral mesentery. 



PLATE LII. 



Fig. 1. Xenia Xovae Britanniae. View of a colony from Lifu (A in Table, p. 519). 



The general shape of the colony, the soft, fleshy base and the strongly convex area from 



which the polyps arise may be seen. The polyps are smaller and closer together near the 

 base of the colony, x 3. 



Fig. 2. X. Novae Britanniae. One of the largest polyps of a colony from Lifu (DI in 

 Table, p. 519). On their outer faces the tentacles show clearly a row of pinnules on each 

 side, the basal three or four pinnules are small, rounded and wartlike, while the more 

 distal ones are longer and more typical pinnules. From the inner aspect three rows of 

 pinnules are visible on each side of each tentacle, x 15. 



Fig. 3. X. Xovae Britanniae. A tentacle of the polyp shown in Fig. 2, seen from the 

 inner or oral side. Near the base of the tentacle there is a narrow area free from pinnules 

 separating the pinnules of the two sides. The more distal pinnules are situated close together 

 and many of them are flattened on one or more of their faces by mutual pressure. The 

 tentacle was slightly flattened in preparation and hence appears a little broader than it would 

 be in life, x 20. 



