282 STUDIES ON TUNICATA, 



(PI. XX vi. tig. 2), and mature spermatozoa obliterate the lumen of 

 the vas deferens. 



An incubo,tory 'pouch is not present; the embryos are hatched 

 in the peribranchial cavity. 



Budding is apparently postabdominal; blind vascular diverti- 

 cula of various lengths are present at the distal end of the post- 

 abdomina of many individuals examined. 



Type to be presented to the Australian Museum. 



Hah.'. Tamarama Bay, Sydney, Kew South Wales (H.L.K.). 

 Tamarama is a small sandy bay on the ocean coast, about four 

 miles from Sydney. Upwards of a dozen colonies of various sizes 

 and shapes were seen attached to the sheltered sides of rocks 

 near low- water mark, on two occasions during January, 1909. 



ClONA INTESTINALIS, var. SYDNEIENSIS StimpSOn. 



(Plate xxvii., figs. 13-1 9). 



Ascidia sydneiensis Stimpson, Proc. Acad. Nat. Sci. Phila- 

 delphia, vii., 1855, p. 387. 



Clona intestinalis (?) Linne, Herd man, Cat. Tunicata Aust. 

 Mus. 1899, p. 9. 



Except Cynthia prcejnitialis Heller, and Boltenia pachyderma- 

 tina Herdman, this variety of the ''common European species" 

 is the most abundant ascidian in the littoral zone of Port Jackson,, 

 Broken Ba}'^, or Port Hacking; and, on dredging almost anywhere 

 in Port Jackson, it comes up in great abundance, attached to 

 seaweeds and stones. 



Owing to the brevity- of his descriptions, the recognition of 

 Stimpson's species must always remain a matter of some doubt. 

 In the present case, however, the peculiar test and description of 

 habitat allow the local student to speak with confidence, 

 Stimpson described six simple ascidians from Port Jackson; of 

 these one alone is described as having a " thin often translucent 

 test." That one is A. sydneiensis., the description of which 

 applies equally well to three Port Jackson ascidians, viz., Ciona 

 intestinalis (?) Linne (Herdman), Ascidia incerta Herdman, and 



