3ft THE AUSTRALIAN MUSEUM. 



Alimentary canal large and cbsely folded on itself. Stomach very 

 arge, with wall finely plicated longitudinally. 



Reproductive organs in the form of 6 long tubular ovaries on the right 

 side of the mantle, and two shorter ones on the left, converging towards 

 the atrial aperture, and covered, especially about their middle, by 

 numerous short ovate or cylindrical spermatic vesicles, which often 

 branch at their free ends. 



Locality. Port Jackson ; two specimens. 



The two specimens figured (PI. Cyn. XII., figs. 1 and 2) seem to 

 belong to the same species, notwithstanding the difference in their shape. 

 The dimensions given above are those of fig. 1 ; the other specimen has 

 the posterior end prolonged to form a short stalk, which makes the body 

 6 cm. in total length. It is 2-5 cm. in breadth, and 1'5 cm. in thickness. 

 The vascular condition of the soft white test is shown in fig. 3. The 

 invaginated test lining the branchial siphon bears numerous small, sharp- 

 pointed spines (fig. 4), all pointing the one way. The stigmata of the 

 branchial sac are unusually long and regular (fig. 5). The narrow dorsal 

 lamina is shown in fig. 6, and the curiously stout dorsal tubercle in 

 fig. 7. The alimentary (fig. 8) and reproductive (figs. 9 and 10) viscera 

 have been sufficiently described above. A Copepod was found in the 

 peribranchial cavity of one of the specimens. 



This species recalls Polijcarpa sulcata, Herdman, of the "Chal- 

 lenger" collection, but is quite distinct from that species. 



Styela Etheridgii, n. sp., PL Cyn. XIII, figs. 18. 



External appearance. Shape somewhat ovate, the posterior end 

 being the narrower, compressed laterally. Branchial aperture anterior, 

 on ventral edge, on a short siphon, or sessile, indistinctly lobed. Atrial 

 aperture on dorsal edge, close to anterior end or a little way down, 

 sessile, but conspicuous, indistinctly 4-lobed. Surface irregular and 

 rough, partially covered with sand and shells, especially on left side and 

 posterior end. Colour greyish brown to yellow. Length 9 cm., 

 breadth 6'5 cm., thickness 4'5 cm. 



Test thin, leathery, inner surface greenish white and glistening; 

 posterior end irregularly thickened. 



Mantle does not adhere to test, moderately thick, musculature strong; 

 colour light brown ; thickened and gelatinous at posterior end. 



Branchial sac, 4 folds on each side, united closely to mantle ; 

 7 or 8 internal longitudinal bars between two folds, and about the same 



