CATALOGUE OF TUNICATA. 69 



lian coast. Mr. Saville-Kent, in his book, "The Naturalist in Australia," 

 reproduces, at p. 216, a photograph of Ascidian-covered rocks at Eoebuck 

 Bay, Western Australia, which shows many hundreds of specimens of 

 what, I think, must be the present species, festooning every ledge and 

 crevice. 



Mr. Saville-Kent, in letters, informs me that this Ascidian occurs near 

 extreme low-tide level. He describes the colour of the living colony as 

 being a smoky grey, upon which the ends of the Ascidiozooids show as a 

 bright cobalt blue. Mr. Kent also tells me, in his letters, of another allied 

 species of a " creamy or light ochre hue," which he dredged from 6 

 fathoms off the Lacepede Islands further north. 



Professor Bitter, of Berkeley, Cal., tells me that he finds on the Califor- 

 nian coast a species that is either Colclla clavifonnis or a closely-allied 

 form. 



Colella cyanea, n. sp., PI. Pel. IV., figs. 16. 



External appearance. The colony consists of a long and rather stout 

 peduncle supporting a very long and gently tapering body, which termin- 

 ates in a blunted upper end (PI. Pel. IV., fig. 1). The colour all over is 

 a dark blue, darker, however, in the body than on the peduncle, while 

 the depressed bodies of the Ascidiozooids are darkest of all, with the two 

 apertures showing on each as two whitish blue spots In consistency 

 the head is soft and flaccid, while the peduncle is much firmer. The 

 wide base of the peduncle spreads out to form short strong rootlets for 

 attachment (PI. Pel. IV., fig. 1). The larger colony measures : Length 

 of body 11*5 cm., breadth 2 cm., thickness 1*5 cm., length of peduncle 

 9 cm., diameter 1*3 cm. 



The Ascidiozooids are arranged without definite order, but are about 

 equally spaced all over the body. An Ascidiozooid is about 5 mm. long 

 and 1-5 mm. broad. It consists of thorax and abdomen, which are of 

 equal size. The vascular appendages from the abdomen are exceedingly 

 long and stout, and run half-way or more down the peduncle. 



The test has many bladder cells, and many dark-coloured pigment 

 cells (fig. 2). The test cells are very large and numerous, and are 

 found of spherical, fusiform, stellate, and other shapes. 



The mantle has muscle fibres, which run longitudinally, and also 

 transverse bundles along the level of each transverse vessel. The 

 branchial aperture is 6-lobed. There are many dark-coloured pigment 

 cells in the mantle. 



The branchial sac has 5 or 6 rows of exceedingly long, narrow stig- 



