68 BRITISH TUNICA TA. 



workmanship hid, as it were industriously, under a 

 rock ; but the works of Nature are every where well 

 finished, and cannot be otherwise than exact and 

 beautiful in their degree. Part of this coating, with 

 its roses in their natural state, may be seen (fig. in), 

 magnified (fig. iv)." 



If this description be compared with the figures on 

 PI. LXVI of Botryllus smaragdus (fig. 1) and B. 

 bivittatus (fig. 4), it will be seen how closely it agrees 

 with the former and greatly differs from the latter, 

 the identity of the species with 7?. smaragdus being 

 also borne out by Borlase's figures.] 



5. Botryllus gemmeus Savigny. 

 (Plate LXII, fig. 2, and PI. LXVI, fig. 2.) 



Botryllus gemmeus SAVIGNY Mem. Aniin. sans Vert. pt. 2 

 [1816], p. 203 ; [FLEMING Philos. Zool. (1822), II, p. 515; 

 DELLE CHIA.IE Mem. Anim. senza Vert. Ill (1828), p. 95; 

 FLEMING Moll. Anim. (1837), p. 214;] LAMARCK Hist. 

 nat. Anim. s. Vert. ed. 2, III [1840], p. 507; [DELLE 

 CHIAJE Descriz. Anim. Invert. Ill (1841), p. 18;]; MILNE 

 EDWARDS Ohs. Ascidies comp. [1841], p. 89, [in Mem. 

 Acad. Sci. InsL France, XVIII (1842), p. 305,] pi. vi, 

 f. 5; [THOMPSON in Rep. Brit, Assoc. for 1843 (1844), 

 p. 264, and in Ann. Nat. Hist, (1) XIII (1844), p. 435; 

 DESHAYES in Cuvier's Regne Anim., Moll. (dr. 1845), 

 pi. cxxviii, f. 1; COCKS in Rep. R.'Cornw. Polyt. Soc. 

 for 1849 (1850), p. 74;] THOMPSON Nat. Hist, Ireland, 

 IV [1856], p. 362; [NORMAN in Zoologist, XVIII (1860), 

 p. 7247]. 



Colony (PI. LXII, fig. 2) forming a thin gelatinous 

 [sub-orbicular] crust, greyish or brownish with the 

 marginal tubes yellow. Individuals rather small, 

 yellow or golden-coloured in the middle, with six 

 lines radiating from a centre ; the upper and lower 

 portions pale violet-coloured ; set in distinct circular 

 systems of from five to twelve [or more] (PI. LXVI, 

 fig. 2). Both apertures bordered with white or 

 yellow. 



