ALCYONIID.E, 267 



PLATE I. 



Fig. 1. Sarcophylum bicolor, n. sp. Drawing of the smaller specimen, which has no capitular marginal 

 seam. Autozooids and siphonozooids are of a beautiful creamy white colour, the remaining portion of the 

 colony being dark grey, x 2. 



Fig. 2. Sarcophylum bicolor, n. sp. Different forms of spicules, x 60. 



Fig. 3. Sarcophylum oligotrema, n. sp. Drawing to show cup-like form of colony, x \i. The autozooids 

 on die margin are smaller and relatively more numerous than in the middle of the capitulum. Siphono- 

 zooids arc very few in number in this species. 



Fig. 1. Sarcophytum oligotrema, n. sp. Surface view of a decalcified fragment of the capitulum, about 

 an inch from the margin, to show the relative abundance of autozooids and of siphonozooids. x 27. 



Fig. 5. Sararphytum oligotrema, n. sp. Three warted spicules, x 60. 



Fig. 6. Sarcophylum contortum, n. sp. Drawing to show the complicated folding inwards of the capitular 

 marginal lobes (e.m.l.). All these lobes arise as marginal ingrowths and not, as in Lobophylum and Sclero- 

 phylum, from the general surface of the capitulum. Autozooids and siphonozooids in this specimen can 

 only be seen with the aid of a lens and are, therefore, not indicated in the drawing, x l. 1 .. 



Fig. 7. Sarcophylum contortum, n. sp. Three warted spicules, x 60. 



PLATE II. 



Fig. 8. Sclerophytum herdmani, n. sp. From a photograph, showing the zooids on the stalk. About 

 A nat. size. 



Fig. 9. Sclerophytum herdmani, n, sp.- Drawings of the different forms of spicules found in this species. 

 a.h.c x7. d.c.f. x60. 



Fig. 10. Alcyonium ceylonicum, a. sp. From a photograph. About A nat. size. 



Fig. 11. Alcyoniwm ceylonicum. A contracted autozooid showing 2 large dorsal mesenterial filaments 

 and a ventral mesentery which has no filament, x 60. 



Fig. 12. Alcyonium ceylonicum. Three spicules characteristic of the species, x 140. 



Fig. 13. Nematocysts of a. Sarcophylum roseum. Actual size 8 - 5/i by 4 '5/*. 

 b. Sclerophytum densum. Actual size 6/x by 4 - 5/x. 

 r. Sarcophylum glaucum. Actual size 20//. by 12//. 

 (/. Lobophylum pauciflorum. Actual size 7/t by 2'5/x. 



The nematocysts of Sarcophytwn glaucum are enormous. The thread is loosely coiled within the cell. 

 The internal portion of the thread stains more deeply than the external. 



Fig. 14. Alcyonium digitalum (British). Drawing of an extended living tentacle, showing the batteries 

 of nematocysts and the single bi lateral row of pinnules (b.cn.). Cam. Inc. x 26. 



Fig. 15. Lobophylum pauciflorum. An autozooid tentacle, showing the asymmetrical arrangement of 

 pinnules, x 60. Cam. luc. The tentacles of the tropical species are usually much smaller than those of 

 the British species (fig. 14). 



Fig. 16. Sclerophytum densum. Zoochlorellae : a and b show early stages of sporogenesis. The 

 cellulose cell walls have disappeared, and the protoplasm and nuclei of the cells show unmistakable signs 

 of division. In b the division is more complete than in a. c represents two very young zoochlorelke I 

 have been unable to observe the intermediate stages between b and c. xl300, &xl600, ex 1200. 

 Cam. luc. 



2 M 2 



