612 PROF. W. A. HERDMAN S BETTSED 



dages. Branchial and atrial apertures circular, the former some- 

 times 4-lobed. 



Test thin and transparent round the ascidiozooids, more solid 

 and opaque in the peduncle. 



Branchial sac with numerous rows of stigmata. No internal 

 longitudinal bars. 



Tentacles 8, 4 large and 4 small. 



Alimentary canal behind tlie branchial sac. Stomach smooth. 



Gonads in the intestinal loop. No incubatory pouch present. 



This genus contains the single species Oxycorynia fascicularis, 

 von Drasche, from the Caroline Islands. 



Chos'deostachts, Macdonald, 1858. 



Colony club-shaped, pedunculated. The peduncle traversed 

 by the long vascular appendages of the ascidiozooids, from which 

 buds are formed. 



Ascidiozooids not imbedded in a common test, but freely pro- 

 jecting from the surface of the colony, each covered by its own 

 thin layer of test. Body divided into thorax and abdomen, and 

 having a long ectodermal vascular appendage. Branchial aper- 

 ture 4-lobed. 



Test thin and transparent over the ascidiozooids, thicker and. 

 more opaque in the common peduncle. 



Branchial sac with no internal longitudinal bars (?). 



Alimentary canal behind the branchial sac, forming an abdomen. 



Gonads alongside the intestine. No incubatory pouch present. 



This genus contains a single species, from Bass Strait, Aus- 

 tralia, unnamed by Macdonald. 



DiSTAPLiA, Bella Valle, 1881. 



Colony in the form of lobed masses or club-shaped knobs. 



Systems distinct, each one forming a knob or lobe of the 

 colony. 



Ascidiozooids elongated antero-posteriorly, and placed verti- 

 cally in the colony. Branchial aperture 6-lobed. Atrial aper- 

 ture provided with a languet. 



Test gelatinous, penetrated by ectodermal prolongations from 

 the ascidiozooids. 



Branchial sac with 4 rows of long stigmata, crossed by 

 narrow intermediate transverse vessels. 



