BOTIIYLLUS M1NIATUS. 77 



thorax, which do not extend around the branchial 

 aperture. [It seems to be a good species.] 



FIG. 129. Botryllus miniatus. Systems, enlarged. 



Genus 23. BOTRYLLOIDES Milne Edwards, 1841. 



Botrylloides MILNE EDWARDS Obs. Ascidies comp. [1841], 

 p. 85, [in Mem. Acad. Sci. Inst. France, XVIII (1842), 

 p. 301 ;] FORBES & HANLEY Brit. Moll. I [1848], p. 23; 

 WOODWARD Man. Moll. [pt. 3 (185(5)], p. 341 H. & A. 

 ADAMS Gen. Recent Moll. II [1858], p. 598. 



Colony sessile, incrusting, gelatinous. Individuals 

 ovate, a little elongated, nearly erect, arranged in 

 undulating or branching lines ; the animals set in single 

 series on each side, forming systems with ill-defined 

 limits, each having an elongated or branched cloacal 

 cavity. Branchial overture nearly terminal, with an 

 entire rim; at rial aperture not far distant, communi- 

 cating with the cloacal cavity. Tentacular filaments 

 usually eight. 



1. Botrylloides Leachii (Savigny) Milne Edwards. 

 (Plate LXIV, figs. 1-3; and fig. 130 in text.) 



Botryllns Leachii SAVIGNY Mem. Anim. saris Vert. pt. 2 

 [1816], p. 199, pi. iv, f. 6, and pi. xx, f. 4; [FLEMING in 



