BOTRYLLOiDES. 23 



6. B, BiviTTATUs, Milne-Edwards. 



Mem, Asc. Corap. p. 308, pi. 6, fig. 7, 7". 



General integument ash-grey. Systems appearing as small 

 stars, with linear yellow rays and dark centres. Individuals 

 coloured like the common integument, but marked between and 

 around their mouths and the common cloaca with two narrow 

 yellow bands. 



Belfast Bay, Mr. W. Thompson. At Torquay and Falmouth, 

 Mr. Alder. 



BOTRYLLOIDES, Milne-Edwards. 



This genus belongs to the same tribe as the last, but the 

 stars formed by the systems of animals are irregular and 

 ramifying. The individuals also differ in position and 

 structure, having their bodies placed vertically and their 

 two orifices approximated. [PI. B, fig. 8.] 



1. B. Leachii, Savigny, (Sp.) 

 Botryllus Leachii, Sav. Mem. 2nd part, p. 199, pi. 4, fig. 6, and pi. 20, fig. 4. 



" Mass forming a gelatinous crust, hyaline, with a purple tint, 

 ornamented with a great number of yellowish vascular tubes. 

 Systems very numerous and closely packed, composed commonly 

 of from ten to twelve individuals, and sometimes of from twenty- 

 five to thirty ; their summits claviform and variegated with white 

 and yellow. Branchial orifice white, with a yellow collar encir- 

 cled by white ; the radial line bordered with white." — Savigny. 



Mass two to three inches across ; size of individuals one-fourth 

 of a line. 



Communicated to Savigny by Leach, probably from the English 

 coast. " North-east coast of Ireland, occasionally investing the 

 roots of Laminaria digitata, &c. When dried it has somewhat 

 the appearance of a sponge," W. Thompson in Ann. Nat. Hist, 

 vol. V. p. 90. 1 Common on the Northumberland coast, Mr. 

 Alder. 



