﻿Dec, 1856.] 



ELLIOTT SOCIETY. 



89 



d, the very much contracted dark ovaries and stomach, 

 c, the chymiferous radiating tubes now turned backward 



e, bell wall reverted. 



/, tentacula hanging within the cavity formed by the reverted bell. 

 x, very small bi-tentaculate larva, 

 y, larger " " 



quadri-tentaculate " 



Fig. 21, PI. 6. — A quadri-tentaculate larva <z, which has connected with it a bi- 

 tentaculate bud by the neck x. At the other extremity of this bi-tentacu- 

 late bud opposite the neck is seen the opening mouth b, with loosened cells 

 hanging to its margin. 



Fig. 22. — A section of the foregoing a short time after when the mouth b had as° 

 sumed its bi-labial form. In this section the form of the inter-communica- 

 ting digestive cavities is shown. 



Fig. 23. — A bi-tentaculate larva which had apparently been separated from its 

 stock before a, which I take to be the oral end had been perforated. A glo- 

 bule of air apparently filled this oral bulb : c is the tentaculiferous portion of 

 the body, where the outlines of the digestive cavity could not be traced, on 

 account of the opacity due to a state of contraction: b represents the stem 

 end of the hydra, in whose cavity was a mass of nutritive matter, probably 

 yolk cells : g represents what was probably a fragment of the membranes 

 which connected this larva with its stock. 



Fig. 26. — Is the stage consequent to that represented fig. 25. The stock larva is 

 quadri-tentaculate, and on the area just below the tentacula is seen the cir- 

 cular fold or crest, g, the incipient disk just issuing. /, /. represents two 

 young buds from the upper surface. 



Fig. 27. — In this stage the otolithic pendents, t. t, are distinctly visible. The four 

 new tentacula are beginning to bud, two of which are seen at c, c. The 

 other letters are — b, the old tentacula ; s. the digestive cavity ; the inner, 

 and o. the outer margin of the body wall ; m. the mouth, and j at this bulb, 

 the thickened portion of the inner wall. 



Fig, 2^. — The new tentacula c. have grown longer and above the otolithic pen- 

 dents, the muscular areas hegin to be stretched out. 



N. Dotted outlines indicate the position of parts which could not be seen in 

 the light or at the focus used for the remainder. 



plate 4. 



Fig. 28a. — One of the muscular areas seen in profile, with the otolithic capsule, 

 not yet divided from it by constriction, but containing two otoliths. 



plate 5. 



Fig. 28b. — Outline of the interior of the bell of the adult, from the top of which 

 hangs the large trunk, or proboscis, terminating in the oral appendages, m, 

 which here are puckered together. Above, between the proboscis and wall 

 of the bell, are three larvae, of different ages, whose syphons o, o. o. are in- 

 troduced into the mouth m of the parent. The larva as, represents a stage 

 of development next succeeding that represented f. 28, PI. 6. 



Fig. 29. — The terminal enlargement of one of the larval tentacula, showing the 

 round cells, supposed to be thread cells, with which it is covered. 



plate 6. 



Fig. 30. — Two larval tentacula attached to the surface of the parent. The di- 



