HYDRAID^. 478 



HYDRA VULGARIS, p. 122. 



" Aug, 2Qth, 1846. I saw to day in Mr. Hyndman's possession, 

 attached to the sides of a glass globe, such as is used for gold-fish, 

 half filled with water, about twenty living Hydros of this species. 

 The tentacula were larger than the body, not attenuated below, and 

 six in number in all the individuals. They were of about the same 

 length as the body (five lines) when it was fully extended, and of the 

 same colour j a very pale reddish-brown. They were taken in the 

 month of May last, from the pond bordering the Zoological Gardens, 

 Phoenix Park, Dublin. Mr. Hyndman has observed that the moment 

 the tentacula of a Limneus pereger touched the arms of one of these 

 Hydrce, the mollusk suddenly drew back, and changed its course, 

 while the Hydra remained immovable. A Planorbis marginatus 

 (about half-grown) was observed to be similarly affected on coming 

 in contact with the arms of the Hydra, but there was no shrinking 

 on the part of either mollusk from contact with the body of 

 that animal. The tentacula alone would thus seem to possess the 

 paralysing power." W. Thompson. 



ANTHOZOA HELIANTHOIDA. 



TURBINOLIA BOKEALIS, p. 196. 



Off the Cornish coast, Professor Edw. Forbes, and Mr. Mac 

 Andrew, dredged a specimen of the normal state of Caryophyllea 

 Smithii, " having a smaller specimen attached exhibiting the form 

 of Turbinolia borealis, and proving their identity. I do not think 

 the Turbinolia-form of Garyophyllia is produced by absorption of 

 the base, but simply by the germ having fixed itself on a very small 

 surface, as a grain of sand ; or, as in the present instance, having 

 attached itself to the side of the parent." Edw. Forbes, 25th Aug. 

 1846. 



" At page 201, you notice the CARYOPHYLLIA RAMEA as being 

 sometimes found on the Cornish shores. This I have several times 

 dredged up, but always dead; and having the appearance of having 

 been in a museum, I am quite convinced that they are not natives of 

 our seas. I have also secured two specimens of Tubulipora musica, 

 one quite red, the other faded and injured, but both having the 

 appearance of previous preservation." ^ 



