138 Transactions of the Canadian Institute. [vol. ix 



Amaroucium glahrum Verrill, 



Numerous colonies, apparently belonging to this species, were ob- 

 tained at nearly all points at low tide and in the dredgings. 



Tetradidemniim albidum (Verrill). 



Both the white and salmon-coloured varieties of this species were 

 found generally distributed at low tide and where dredgings were made. 



Didemnopsis tenerum (Verrill). 



Syn. Lissodinum tenerum Verr. 



Several colonies were dredged in the approaches to Passamaquoddy 

 Bay and one off Swallow-tail Light, Grand Manan. 



Holozoa clavaia (Sars)? 



Soft, light yellow, encrusting colonies of Holozoa were obtained at 

 low water mark and practically throughout in the dredgings, though 

 never in large numbers. Dr. Van Name has referred all the colonies 

 from along this coast, that were examined by him, to Sars' species. 

 None of the colonies in my collection show even an approximation to the 

 clavate condition. 



Cio?ta intestinalis (L.) 



As only a single small specimen was obtained (off Grand Manan), 

 no detailed study of it was made. It doubtless is identical with the 

 European species. 



Ascidiopsis pruniim (Muller). 



Syn. — Ascidia callosa Stimpson, Proc. Bost. Soc. N.H., vol. IV, p. 

 228. 

 Ascidiopsis complanata Verrill, Amer. J. Sc, ser. Ill, vol. 3, 

 p. 289. 



Characteristic of this species is the small number of longitudinal 

 bars (from 15 to 19 on the left side and from 18 to 20 on the right), the 

 presence of intermediate papillae and the crossing (slightly) of the last 

 bend of the intestine by the genital ducts. Eggs and larvae were found 

 in the peripharyngeal cavities of some of the breeding individuals. The 

 large individuals seemed to be uniform in having undeveloped repro- 

 ductive organs. 



Found in large masses at low tide mark. It is generally distri- 

 buted as shown by the dredgings. At Grand Manan it seems to be largely 

 replaced by the next species. 



Genus Phallusioides nov. 



This genus is formed for the reception of Ascidia {sen Phallusia) 

 obliqua, which differs from Phallusia in that the pharynx and dorsal 

 lamina do not extend beyond the oesophageal aperture, in this respect 



