282 BULLETIN OF THE 



The youngest larva of Glossocodon which we have found was approximately 

 in the same stage as that figured iu fig. 18 of Fritz Muller's ])aper. It resem- 

 bles closely the larva which Haeckel * figures, PI. III. fig. 35, as the young of 

 G. eurybia. In Haeekel's representation of this stage, no chymiferous tubes 

 are to be found. The bell in his figure is also more spherical, and the profile 

 of the bell cavity lacks the rectangular shape which our youngest larva had. 

 The bell is low, disk-shaped, transparent, and has a smooth outer surface. 

 The bell cavity has a cylindrical shape, its walls following closely the outer 

 surface of the bell. The bell walls are of about uniform thickness throughout. 

 There are four radial tubes passing from the bell margin to the centre of the 

 upper floor of the bell cavity. They bear no sexual pouches. 



The proboscis is the least developed of all the appendages to the bell in the 

 youngest larva which was captured. It has the form of a simjjle, raised wall 

 of rectangular shape, arising from the upper floor of the bell cavity. There is 

 in it no division into stomach and peduncle. The lips are simple, and are 

 destitute of the clusters of lasso-cells found in the adult. 



There is only one kind of tentacular appendages to the bell margin in this 

 larva, and these are the club-like bodies situated midway between the tentac- 

 ular or radial tubes. The long flexible tentacles at the end of the radial 

 vessels have not yet begun to form. Those tentacular bodies which are present 

 are solid and are carried stiffly elevated at the side of the bell. Their length 

 is about that of the radius of the bell, and their diameter near their distal 

 extremity is very much greater than at the attachment to the beU. rim. The 

 inner concave side of the appendage is smooth and without lasso-cells ; the outer, 

 convex surface bears many clusters of cells arranged in bundles in a series. 

 These bodies are especially numerous near the terminal end of the tentacle. 

 On the outer surface of the appendage, near its junction with the bell margin, 

 a small conical tooth is developed. A similar spur is not to be found in the 

 published figures of G. eurybia or L. Catharinensis. These tentacles are repre- 

 sented in the adult by bodies (c) of reduced size, which are said eventually to 

 disappear in Glossocodon.-\ 



While these bodies are the only tentacles found upon the bell margin, they 

 are not the only appendages of a tentacular nature which the youngest Glosso- 

 codon has. A second kind of appendage, also embryonic, is situated on the 

 outer surface of the bell walls. At right angles to the sides of the bell, in the 

 same spheromere in which the radial tubes lie, there spring four solid append- 

 ages, which are true tentacles. At its distal end each of these tentacles is 

 enlarged, and bears many lasso-cells ; but of its minute anatomy and the 

 arrangement of cells at that point nothing was observed. Its base of attach- 

 ment is about one third the distance between bell margin and apex, and is 

 connected by a rib {b) with the bell rim. This rib is probably a solid body 



* Die Familie der En.sselquallen, 1865, Tl. III. fig. 35, pp. 67, 68. Called by 

 Haeckel the fourth stage {Eurybia-like larva). 

 t Haeckel, op. cit. 



