BRETTIA TTJB.EFORMIS. 29 



Zooecia elongate, somewhat trumpet-shaped, slender 

 and tubular below, and expanding gradually upwards, 

 with a distinct joint a little above the base ; aperture 

 terminal, slightly oblique, suborbicular, with about 

 ten short spines round the margin. Oaecia unknown. 

 Height about J inch. 



LOCALITIES. South-east coast, on Fucus (R. S. Boswell) : 

 the Minch, Hebrides (A. M. N.) . 



Many years since, I received from Mr. R. S. Boswell a 

 drawing of this form, which he had found on the English 

 coast ; but as it was unaccompanied by specimens, I was 

 unwilling to publish it. In the mean time Mr. Norman 

 dredged in the Minch a minute fragment of a species 

 which he referred, in his Report on Hebridean Polyzoa &c., 

 to Brettia pellucida, Dyster. He was good enough to 

 intrust it to me for examination ; and it was with great 

 pleasure that I recognized in it the species represented in 

 Mr. Boswell' s characteristic sketch (Plate V. fig. 1). 



B. tub&formis is readily distinguishable from B. pellu- 

 cida by the shape and proportions of the cell, and by the 

 terminal position of the aperture. The zooscium expands 

 regularly from the slender base towards the top ; and the 

 upper portion is broader as compared with the lower than 

 in the last species. The cell of B. pellucida is almost 

 cylindrical, that of B. tubaformis has the form, as its 

 name denotes, of a trumpet. The position of the aper- 

 ture at its summit, looking obliquely upwards, also pro- 

 duces a marked change in the general appearance. In 

 B. pellucida it is placed on the front surface immediately 

 below the top. In one case it is suborbicular in form, in 

 the other obovate*. 



The branching is dichotomous and perfectly simple. 



* Mr. Boswell states (in lift.) that the oral spines are movable. 



