12 BOTRYLLIDiE. 



at the upper side of the stomach, which is large, yellowish- 

 brown, and mottled ; intestine ;dark-coloured, wide, flexuose, 

 recurved, and winding up at the base of the branchial sac ; anal 

 aperture elongate, linear, entire, lateral, and near the mouth ; 

 ovary white, cellulose, at the base of the intestine, with a long 

 ■white tubular canal running up and along the middle of the in- 

 testine, and terminating in the branchial cavity. Differs from the 

 Aplidiwn Jicus in having the apertures in the common envelope 

 entire, whereas in the A. Jicus they are distinctly cut into six 

 equal fays. (See Ellis, Corall. tab. 17, fig. B. C. D.) Hab., affixed 

 to old shells, <fec. from deep water in Berwick Bay." — Johnston, 



3. A. NUTANS, Johnston. 



Mag. Nat. Hist. 1st series, vol. vii- p. IG, fig. 5. 



" Common body adherent by a broad base, knob-like or pear- 

 shaped, nearly an inch high, and half that in diameter, smooth, 

 gelatinous, pellucid, of a straw-yellow colour, tinted with brown, 

 and marked with whitish streaks from the immersed animal. 

 There are no fibres nor spicula to strengthen this common mass ; 

 neither are there any visible orifices on the surface ; but by rip- 

 ping up the skin with a needle, the contained animals may be re- 

 moved entire without difficulty. These are of a long thread-like 

 shape, with a bulging and nutant head, scattered irregularly in 

 the substance of the jelly, in which they lie horizontally, or nearly 

 so. The length of a single individual is about four-tenths of an 

 inch. The mouth is cut into six equal segments, and placed on 

 the upper side of the large branchial sac, which is an oval bag filled 

 in the specimens examined with innumerable minute granules. 

 When the animalcule was compressed between plates of glass, 

 these granules escaped abundantly from the mouth, and from a 

 prominent aperture a little below it on the side. The walls of the 

 branchial sac are marked with several lines or plaits in a longitu- 

 dinal direction, but I saw no traces of any vascular network. On 

 the inner side of the branchial sac there is an obscure appearance 

 of an intestine or vessel winding up it, to end at the anal aper- 

 ture ; and near the base of the sac there is a considerable orange- 

 coloui'ed spot marked with longitudinal lines, and presumed to be 

 the stomach. Immediately below this, the body is suddenly con- 



