68 MR JAMES RITCHIE 



Localities, etc. (a) Growing on the axis of an Alcyonarian (Thouarella), and dredged 

 off Gough Island, lat. 40 20' S, long. 9 56' W., at a depth of 100 fathoms. Date, 

 22nd April 1904. (b) St Helena. 



Halecium interpolation, n. sp. (PL I. fig. 3 ; PL II. fig. 3.) 



A number of colonies, the largest about 4 cm. high, have been found in a shore- 

 pool. The colony is fascicled for the most part, but becomes monosiphonic distally. In 

 the older colonies the lower portion of the stem, which is less than 1 mm. in diameter, 

 is usually destitute of important branches, while the upper portion bears long flexuous 

 branches, often 15 mm. in length, which leave the stem at acute angles and in different 

 planes. This structure gives the colonies the appearance of a miniature tree. The 

 branches arise either singly from the basal segment of a hydrotheca or directly from 

 the hydrocaulus, in diverging pairs, one being at a slightly higher level than the other. 



The stem and branches are divided into slender internodes of very different lengths, 

 varying from over 1 mm. to 0'4 mm., and marked at both ends by an annulation. 

 The hydrothecee are alternate, and are borne at the distal ends of the internodes, two 

 thecate internodes being almost invariably separated by one or more athecate inter- 

 nodes. Very frequently a short, annulated, hydrotheca-crowned branch arises from the 

 basal segment of a primary hydrotheca. The hydrothecse are usually simple, consisting 

 of a strongly annulated peduncle about 1 mm. long, surmounted by a well-everted 

 limbus measuring 0'2 mm. from margin to margin. Occasionally a second limbus 

 arises on a short stalk within the first. Around the limbus occurs the row of refringent 

 prominences found throughout the genus, and here, as in the other cases which have 

 been examined, they serve as attachment points for strands supporting a disc at the 

 base of the polyp. 



Gonosome.- Not present. 



Locality, etc. Off rocks in shore-pool. Temperature, 30-32. Scotia Bay, South 

 Orkneys. 6th December 1903. 



One of the branches ended in peculiar, stolon-like outgrowths, as is shown in fig. 3, 

 PL II. The specimens, which have probably been cast by some storm into the shore- 

 pool in which they were found, are in poor condition, being almost wholly overgrown 

 by polyzoa. The specific name is intended to suggest the presence of the characteristic 

 athecate intermediate internodes. 



Family CAMPANULARIIDJE. 

 Campanularia angulata, Hinks, 1861. 



Several specimens about 1 cm. high were found creeping on an alga. The specimens 

 agree with HINKS'S description : slightly branched stems ringed above the origin of the 

 pedicels ; strongly ringed pedicels, usually with nine rings, sometimes with only about 



(HOY. soc. EDIN. TRANS., VOL. XLV., 526.) 



