62 Proceedings of the Royal Physical Society, 



of the glutinous " colletoderm " thickened by fine mud. The 

 tentacles were frequently united together in pairs by the same 

 substance. The unclothed half only of the tentacles was 

 furnished with thread-cells. The bodies and clothed part of 

 the tentacles were frequently studded with minute crimson 

 Algae (fig. 4, a), which in some cases almost concealed the 

 polyps, but did not seem to exercise any deleterious influence 

 on their health. 



The male reproductive apparatus consisted of an ovate pe- 

 dicled ectodermal sac (fig. 4, b), inclosing a linear unbranched 

 process of the endoderm, as in Hydractinia, the whole enclosed 

 by the horny corallum with its muddy covering. The female 

 reproductive system was not discovered. 



4. Garveia nutans. (Plate III., fig. 5.) 



Polypary enclosed in smooth or slightly- wrinkled corallum, creeping or 

 forming a stem of many agglutinated tubes from which the polyp stems diverge 

 as branches; polyps not retractile within the corallum, decumbent when con- 

 tracted; tentacles about ten, thick, in a single row, not alternate; mouth not 

 trumpet-shaped; colour of polyp vermilion and yellow; thread-cells incon- 

 spicuous. 



This zoophyte, which occurs on Inch Garvie, is conspicuous 

 for the singular colour of its polyps ; the ectoderm being of 

 a fine transparent yellow, the endoderm vermilion. Conse- 

 quently the tentacles are yellow, while the body of the polyp 

 is red. When irritated, as by being removed from the water 

 and re-immersed, the zoophyte bends all its polyps downwards, 

 like flowers drooping on their stalks. 



The reproductive capsules (female), which I have only seen 

 in a specimen after immersion in spirits, arise from the creep- 

 ing polypary or the compound stem, and resemble in their ex- 

 ternal characters the female capsule of Eudendrium rameum. 



This zoophyte was at first mistaken by me for an Euden- 

 drium, but it differs from the latter genus in the following par- 

 ticulars : — In Garveia the body of the polyp is fusiform ; in 

 Eudendrium globular, with a trumpet-shaped expansible pro- 

 boscis. In Garveia the tentacles are arranged in a single row ; 

 in Eudendrium also in a single row, but each alternate ten- 

 tacle is elevated or depressed, so that they appear to be dis- 



