242 TETHYDZ. BOTRYLLIDZ. 
orifice white, surrounded with a colour of fawn encircled with 
white ; the radial line on passing the two orifices is bordered 
with white. Diameter two or three inches; the animal three- 
quarters of a line. 
2. BotTRYLLUS SCHLOSSERI. 
The body gelatinous, semitransparent, with very numerous 
systems; the animals from twelve to thirty, with their extre- 
mities claviform. 
Uva marina, Rondeletii Hist. Pis. Pars ii. 90. 
Aleyonium carnosum, Schlosser, Act. Ang. xlix. Parsi. 1757. 
no. 61 et 449. t. xiv. f. 14. A. B. C; Borlase, Nat. Hist. 
Cornw. 254. t. xv. f. 1-4. 
Aleyonium Schlosseri, Pallas, Elench. Zool. no. 208; Linn. 
Syst. Nat. xi. 1294. no. 6. 
Botryllus Schlosseri, Savigny, Mém. sur les Anim. sans Vert. 
Resch. sur les Ascidies comp. et simp. Fas. 1. t. xx. f. 3. 
Inhabits the European seas on the shores of England and 
France. 
The body of this species is composed of a gelatinous semi- 
transparent mass, tinted sea-green or cinereous, the margins of 
the tubes yellow-ferruginous ; the systems very numerous, com- 
posed of ten or twelve, twenty or more, with their extremities 
claviform, variegated with yellow and red; the branchial aper- 
ture white, surrounded with large spots of the same colour. 
The outer integument is yellow without any visible muscular 
fibres; tentacular filaments eight as in all the other species in 
this section ; four are shorter than the others and alternate with 
them; the branchial sac at its upper part with red sinewy 
chord; the branchize are nearly colourless, composed of six 
transverse vessels and twenty longitudinal vessels more slender 
than the transverse ones, excepting three which are equally as 
large as the transverse ones; the branchial vein has no small 
branches ; the stomach is nearly horizontal, channelled, with a 
small ceecum near the pylorus; this occurs in the following 
species, but it is in them smaller and more obtuse ; the intes- 
tine is reflected above and passes under the superior aspect of 
