CATALOGUE OF TUNICATA. 17 



species had not been named nor described until the Eeport upon the 

 the "Challenger" Collection* in 1882. Since then von Draschef has 

 given some further remarks and another figure of the species, from 

 specimens obtained by the " Novara " Expedition to the South of 

 Sydney. Von Drasche describes short knobbed calcareous spicules in 

 the test. I have since found calcareous spicules in these Australian 

 forms not only in the test, but also in the mantle and in the larger 

 vessels of the branchial sac (PI. Cyn. I., fig. 2). Those of the mantle 

 are elongated fusiform curved spicules, and those in the branchial sac 

 are rather like the spicules of Culeolus. 



The dorsal tubercle is, in the large specimens, even more complicated 

 in its pattern than I showed in the "Challenger" Keport. I give a 

 figure here (fig. 3) which shows also the presence of branched spicules. 



The specimens in the collection are a group of 14 individuals adhering 

 to the same basal mass (see PI. Cyn. I., fig. 1), two others of smaller 

 size attached together, and two or three other specimens of medium 

 size. The largest specimen attains to about 35 cm. in length, including 

 the stalk. 



Boltenia tuberculata, HerdmanJ, 1891, PI. Cyn. II. 



External appearance. Irregularly club-shaped, the body being of 

 irregularly ovate form placed on a short curved stalk and covered with 

 tubercles or knobs. There is not much lateral compression. The 

 apertures are not far apart, both on one surface, both transverse slits 

 surrounded by many lobes, of which, however, there may be 4 more 

 prominent. Surface very uneven on account of the numerous knobs. 

 Colour dirty creamy white, to light brown. Size (average), body 5 cm. 

 by 3 cm. by 2 cm. ; stalk about 12 cm. in length. 



Test very irregular in thickness, from 1 mm. to 10 mm., cartilaginous, 

 white in section. Large vessels are found about the top of the stalk. 



Mantle thick, closely adherent to test. The finer muscle bundles form 

 a close felted mass, while there are strong longitudinal and circular 

 muscles extending from the siphons over the greater part of each side. 



Branchial sac with 6 or 7 folds on the right side, and 6 on the left. 

 The folds converge to the mouth of the oesophagus. There is a mesh 

 work consisting of very stout internal longitudinal bars and more slender 



Report on Tunicata, Part I., p. 89. 



t Deuksclir. K. Akad. Wiss. Wien, Bd. XLVIII., p. 370. 1884. 

 I Briefly diagnosed in "Revision," p. 571, now fully described and figured. 



