•J68 THE VOYAGE OF H.M.S. CHALLENGER. 



are crammed with minute eggs {S',S'), which press on the genital bursas 

 {S,S) ; the strongly corrugated digestive cavity (St), whose upper wall 

 clings to the roof of the disk ; inter-mouth frame muscle (fm) ; jaw (c). 

 Fig. 5 Ophiocamax, sp. nov. ? , f. [Exp. of U. S. str. " Blake."] Vertical section of 

 the disk passing through the sides of two arms. On either side is a genital 

 bursa {S,S) emptying by the genital opening {no), and making a fohl 

 ' above over the digestive cavity (tSV), into which hang two more folds 

 {S,S) which are cut through. Above the bursas are pockets ('^V^') 

 containing embryos just beginning to develop. A larger view of one of 

 these is given in fig. 4, Plate XLVI. ; section of second mouth-tentacle {/') ; 

 wings of arm bones shaved by the section («''). 



PLATE XLVIIL. 



Gorgonoccplialus verrucosus, Lym. Diagram of the right stem, or half of an arm 

 carried out to its last forks, -|. 



The fieures indicate the order of forks as counted from th(' disk. Fork 1 is not seen, 

 as it lies within and under the disk, just beyond whose margin is fork 2 of this right 

 stem. 



For observations on the mode of forking among Astrophytous, see Proceedings of the 

 Boston Society of Natural History, vol. xix., March 7, 1877. 



This plate is quite a monument of patience on the part of my assistant. Miss Clark. 

 It is no fancy sketch, but a reduction of a large drawing, to make which every fine twig 

 was separately unrolled and measured, so that not only is the numl>er of forkings correct, 

 but also the proportions of the parts. 



I take this opportunity to acknowledge the skill and fidelity of my artists. Miss K. 

 Peirson and Mr. L. Trouvelot, shown in the preparation of the original drawings and 

 the plates. 



