"294 STUDIES ON TUNICATA, 



to the test, and in the number of internal longitudinal vessels on 

 -fold and interspace in the mantle, as well as in the character and 

 situation of the gonads; that is, if the generic name applied by 

 Herd man may be taken for a description of his species. 



Herdman* has expressed the opinion that Dendrodoa " should 

 be merged in Styela"; the present species, however, has the 

 genital gland in the form characteristic of Polycarpa. If D. 

 glandaria MacLeay, is to be regarded as a Stylea, then D. gregaria 

 Kestv., must be placed in the genus Polycarpa. 



All of the Hobart material discussed in this paper was obtained 

 by the late Mr. Morton, attached to a large wooden box raised 

 from a depth of 5 fathoms. Since upwards of one hundred 

 specimens were so obtained, the abundance of Tunicata in Hobart 

 Harbour must be very great. 



In concluding, I wish to thank Professor Anderson Stuart, in 

 whose laboratory this work has been done. 



EXPLANATION OF PLATES XXV.-XXVIL 



Abbreviations. 



A,, anus— Atr. Ap., atrial aperture— Br. Ap., branchial aperture — D.L., 

 dorsal lamina, or dorsal languets— End., endostyle — Emb,, tailed larvae — 

 Fids., branchial folds— G., subneural gland — Gon., gonad— N.G., nerve 

 ganglion — Oes., oesophagus- Ov., ovary— II., rectum- St., stomach— T., 

 tubercular diverticulum of the cloacal chamber — V.D., vas deferens. 



The outlines in every case were obtained with camera lucida or reflecting 

 prism. 



Plate XXV. 



Fig.L — Dendrodoa gregaria Kesiv.', seen from above. 



Fig. 2. — ,, ,, ,, stomach. 



Pig.3. — ,, ,, ,, dorsal tubercle and related parts. 



Pig. 4 — Molgida mortoni Kestv.; dorsal tubercle and related parts, seen 



from above. 

 Fig. 5. — Molgida mortoni Kestv.; complete specimen, seen from above. 

 Fig. 6. — Corella valentinoe Kestv.; dorsal tubercle and related parts. 

 Fig.7. — ,, ,, branchial wall, atrial aspect. 



Fig. 8. — ,, ,, ,, ,, branchial aspect; diagram- 



matic. 

 Fig.9. —Sidneioides tamaramce Kestv.; a single zooid. 



* Challenger Report, Tunicata, Pt. i., p. 148. 



