CRISTATELLA. 101 



Plate XXVII. Fig. 3. The specimen fig. 1, in decay, 28 days subsequent to its 



original delineation in vigour. 



4. One of the halves of fig. 2 in decay. An ovum a, escap- 



ing through its substance. 



5. Nascent Cristatella protruding from a sundered ovum. 



6. Nascent Cristatella from an ovum of fig. 1, which sun- 



dered between 202 and 230 days after production. 



7. Nascent Cristatella, wherein the genuine configuration 



of the sole appears at an early period : slightly en- 

 larged. 



8. Nascent Cristatella, a, 5, c ■: natural size. 

 9. 10. 11. The same enlarged. 



12. Nascent Cristatella seated on an empty ovum. 



13. Nascent Cristatella, consisting of six hydrse, disposed 



around the common basis. 



All the figures of this Plate, except figs. 1, 2, 3, 4, 8, 

 are enlarged. 



Plate XXVIII. Fig. 1. Hydra. 



2. Young specimen from the ovum, when consisting of two 



hydrse ; shewing their relation and the arrangement 

 of the parts. 



3. Adult specimen. 



4. The same seen in profile. 



5. The same enlarged, viewed from above. 



6. Prolific specimen. 



7. Ova. 



8. Ovum slightly enlarged. 



9. Ovum more enlarged, showing the border of recurved 



spines. 

 All the figures of this Plate, except figs. 3, 4, 7, are 

 enlarged. 



& 2. Alcyonella. — Plates XXIX., XXX. — The subject of the last 

 paragraph is sufficiently definite, — set apart by Nature herself so wide 

 from all others, that it cannot be mistaken. But as to the subjects of the 

 present paragraph, whether it may be owing to my more limited range, to 

 an ungenial site, to premature investigation, or otherwise, I find much 



