322 
Z. ASCIDIOIDA. 
Plumatella. 
does not colour at all, if not a yellow, the granules of the perisperm 
which their appearance suggested to be amylaceous, but alcohol sepa- 
rates from them a fatty substance, for, in spontaneous evaporation, 
this menstruum deposits on the object-glass a white layer over which 
water glides without raising any thing from it. 
On examining by refraction one of the eggs with a magnifier of 
100 diameters, very often another transparent narrow margin becomes 
visible, which overlaps all the circumference and indicates an external 
envelope of extraordinary delicacy. On one side of this there is to be 
distinguished an evident trace of the old adhesion of the egg to the 
walls of the tubes which enclosed them, — a point which may be call- 
ed the hilum. Very often, however, this delicate tunic may be 
sought for in vain on other eggs. 
43. Plumatella, * Bose. 
Character. Polypidom fixed , membranaceous , confervoid , 
slender , tubular , irregularly branched ; the polypes issuing from 
the apices of the branches, — Polypes ascidian , crowned with a 
single series of ciliated tentacula. 
1. P. repens, c ‘ stem adhering ; tentacula disposed in a cres- 
cent” Rev. Dr Fleming. 
Fig. 51. 
reptans, Turt. Gmel. iv. 669. Plumatella repens, Lam. Anim. s. 
Vert. ii. 108. 2de edit. ii. 123. Flem. Brit. Anim. 522. Stark, Elem. 
ii. 441 Naisa repens, Coral. 98. La Plumatella rampante, Blainv. 
Actinolog. 490. f 
* The diminitive of plumata — plumed. 
*|- To this synonymy it may be useful to add the following, communicated to me 
along with a dried specimen of the polypidom, by J. Hogg, Esq. “ A small 
piece of it is figured in Schccff. Armpolyp. tab. i. fig. 1, 2, published in 1754. 
The next representation of it is in tab. 19, fig. 1-5, in the Bulletin Philomatique 
