56 



lilv'ITiSH TUN10ATA. 



I (1857), pi. xviii, f. 26; NORMAN in Zoologist, XV (1857), 

 p. 5707; DICKIE in Rep. Brit. Assoc. for 1857 (1858), 

 p. Ill; MERRIPIELD Nat. Hist. Brighton (1860), p. 81; 

 LANSZWEERT in Ann. Soc. Malac. Belg. Ill (1868), Mem. 

 p. 115; L. & A. AGASSIZ in Gould's Rep. Invert. Mass, 

 ed. 2 (1870), p. 3, pi. xiii, f. 319]. 



Botryllus verrucosus DAL YELL Rare and Rein. Anim. Scotl. 



II [1848], p. 156, pi. xxxviii, if. 1-13, and pi. xl, if. 1-3. 



Colon;/ a thick fleshy [or gelatinous] crust, spread- 

 ing over stones or forming an amorphous mass on the 

 stems or fronds of Algae (PL LXI, fig. 1 ) ; semi- 

 transparent and of a greyish or olive hue, with 



K... 



FIG. 116. Individual of Botryllus Schlosseri. Much enlarged. 

 (Savigny, pi. xx, f. o 2 .) B, branchial aperture ; b, cesophagus ; C, 

 atrial aperture ; c, stomach : c, caecum of the stomach ; F, branchial 

 sac ; H, anal aperture ; h, anterior (branchial) tubercle ; K, ovary ; 

 k, posterior tubercle ; k, excrement contained in the intestine ; 

 t, egg. 



imbedded yellow gemmae. Individuals (fig. 116) 

 uniformly yellow in colour, more or less deep, some- 

 times inclining to green, each with a central dark red 

 spot ; arranged in numerous systems of from five to 

 twelve or more [? 10 to 20], forming circular or oval 

 stars with a common sub-tubular excretory orifice 

 (PL LXL fig. 2). The masses often three or four 

 inches (76-102 mm.) in diameter. 



Length of individuals [about aline (2mm.)]. 



Hal. On the underside of stones and on seaweeds 

 between tide-marks and in the Laminarian zone. 



