PHYSIOLOGY OF THE INVERTEBRATA. 215 



(&) Bunodes crassicornis. — Moseley * examined this Actinia, 

 and he found in two specimens the tentacula were a rose 

 colour, the colour being due to actiniochrome. MacMunn 

 has more recently examined the pigments of this species ol 

 Bunodes ; and he found that the colour and spectra differ 

 considerably in different cases. The conclusions arrived at 

 are that " in Bunodes crassicornis we find actiniohasmatin 

 with tolerable constancy, occasionally actiniochrome and also 

 biliverdin, besides the lutein-like (lipochromes) pigments. 

 In the ectoderm, as well as in the endoderm, and sometimes 

 in the tentacles, actiniohsematin is present. In none of the 

 specimens were 'yellow cells ' present, and by no other solvents 

 except glycerol, and alkaline and acid alcoholic solutions, 

 could any pigments be got into solution." 



(c) Bunodes hallii. — The tentacles and mesenteries of his 

 anemone, when examined by the microspectroscope, gave a 

 number of bands, which showed the presence of a chlorophyll- 

 like pigment. In the large variety of this species the tentacles 

 are packed with " yellow cells " t lodged in part in their 

 endodermal lining. It appears that these "'yellow cells" 

 replace the red pigment of other species, since the latter 

 is present in mere traces. No " yellow cells " are present 

 in the tentacles or elsewhere in the small variety of Bunodes 

 hallii. The inner tentacles of this variety gave the spectrum 

 of actiniochrome; but no haemochromogen was produced 

 from these anemones. Still, the fact is interesting, that the 

 pigment of the ectoderm resembles, with regard to the first 

 band of its spectrum, that of A. mesembryanthemum ; and 

 MacMunn remarks that "it may have been a pigment which 

 is intermediate between actiniochrome and actiniohsematin. 

 The replacement of this pigment by the colouring matter of 

 the ' yellow cells ' in the large variety is of great interest, 

 and teaches that the presence of the colouring matter has 



* Quart. Jov/rn. Micro. iSoc, vol. 12, p. 143, 

 t Symbiotic algae. 



