312 



ANALYTICAL INDEX. 



CHAPTER Will.— continued. 



Pulsation three weeks visible in the nascent Botryllus, page 163 



Irregularities, . . . . . . 164 



Second young ascidia beside the first, . . . ib. 



Others successively enlarge the specimen, ... ib. 



Quiescence essential for evolution, .... 165 



Spinula does not adhere if disturbed, ... ib. 



Sanguiferous system, ...... ib. 



Substance of the Botryllus, .... ib. 



§ 4. Specimens of the Botryllus, 

 ( 1 . ) Yellow specimen described, 

 (2.) Specimen with indefinite systems, 

 (3.) Yellow specimen rapidly decaying, 

 (4.) Specimen resembling a fig, 

 (5.) Specimen resembling a dried fig, 

 Indefinite systems becoming definite, 

 (6.) Specimen covered by 60 systems, 

 Ascidia papilla, history in abstract, 

 Botryllus verrucosus, history in abstract, 

 Plate XXXVII., figs. 12-24 explained, 

 Plates XXXVIII., XXXIX., XL., XLI. explained, 



166 



ib. 



ib. 



167 



168 



ib. 



ib. 



169 



ib. 



170 



171 



ib. 



CHAPTER IX. — Asteroidal Zoophytes. 



Asteroid hydra? have 8 tentacula, 

 Denominated carnosa, 

 Their nature imperfectly understood, 

 All are marine, 

 All arc compound, 

 Intumescence of specimens, 

 Hydra not enlarged by it, 

 Beautiful and interesting objects, 



174 



ib. 



175 



ib. 



ib. 



176 



ib. 



ib. 



ib. 



§ 1. LoBULAraA, 



Contracted surface stellate, 



Asteroid hydra larger than others, 



Lobularia can swell and evacuate itself, 



Surface of the base like leather, 



Colour white or orange, 



Nauseous odour imparted by contact, 



Propagation by yellow ova, 



ib. 



177 



178 



ib. 



179 



ib. 



ib. 



ib. 



