136 BRITISH TUNICATA. 



with caution. Through the kindness of Dr. Acland 

 we have had the opportunity of seeing the original 

 specimen now in the Oxford Museum. 



1. Thylacium aggregation (Rathke) V. Cams. 

 (Plate XL VI, figs. (3-8.) 



Asctdia ai/</n.'i/ata EATHKE in Miiller's Zool. Danica, IV 



[1806], p. 11, pi. cxxx, [fig. 2]. 

 Cynthia agyregata FORBES & HAXLEY Brit. Moll. I [1848], 



p. 41, pi. D; f. 5 ; [ANSTED Channel Isl. (1862), p. 219]. 

 TJu/lartum aggregatxnt VICTOR CARUS in Proc. Ashniol. Soc. 



II [(1851), p. 268]. 



Boil ij bottle-shaped, cylindrical, bright orange (or 

 flesh-coloured), erect and adhering by a small base. 

 Apertures terminal, approximate, of a deeper orange 

 than the body and margined with red. Test (PL XLVI, 

 figs. 6 and 7) nearly smooth, or slightly wrinkled, 

 rather thin, sending out at the base slender root-like 

 fibres, which are occasionally nodose. Tentacular 

 filaments linear, stout, flattish, and tapering, alternately 

 large and small. Branchial sac with two folds on each 

 side. Oral lamina smooth, broad. Ocaries in two 

 longitudinal rows near the back, curved a little at the 

 base, bright orange or scarlet. 



Length about an inch. 



Var. maculatum var. nov. Smaller and rather more 

 ventricose, of a flesh-colour spotted with red, minute 

 fragments of shell adhering to the surface. 



Halt. Under large stones, in 12 fathoms water. 



ENGLAND. Dartmouth, Devon ; gregarious in vast 

 numbers (Forbes McAndrew). Scilly Isles (Cams). 



CHANNEL ISLANDS. Guernsey (Norman fy Aider). 



First record. Forbes & Hanley, 1848; coll. Forbes 

 & McAndrew, 1846. 



[The habitat and localities apparently refer to both 

 the type and the variety.] 



