EEPORT OX THE TUXICATA. 
327 
These are all old genera with the exception of Chorizocorinus, which is formed for the 
reception of a new species collected by the Challenger Expedition at Kerguelen Island. 
It is allied to Synstyela, but differs from that genus in having the colony broken up 
into a number of distinct pieces united by stolons, in place of forming a continuous 
incrusting layer. 
The Challenger Polystyelidse represent three out of the six genera in the above table, 
viz., Goodsiria, Cunningham, Synstyela, Giard, and Chorizocormus, Herdman. There are 
five species, four of which are new to science, in the collection. 
Goodsiria, Cunningham. 
Goodsiria, Cunningham, Trans. Linn. Soc. Lond., vol. xxvii. p. 465, 1871. 
Colony massive, sessile or pedunculated, not incrusted wdth sand. 
Ascidiozooids large and ovate in shape, completely imbedded in the common test ; 
not divided into thorax and abdomen. Apertures four-lobed, both on the 
anterior end. 
Test solid, cartilaginous, not sandy. Matrix delicately fibrillated. Vessels present. 
Branchial Sac well developed ; folds present, rudimentary, or absent ; internal 
longitudinal bars always present. 
Dorscd Lamina in the form of a plain membrane. 
Alimentary Caned not prolonged behind the branchial sac. Stomach folded 
longitudinally. 
Reproductive Organs in the form of polycarps. 
This genus was founded by R. 0. Cunningham in 1871 for a large species, Goodsiria 
coccinea, which was obtained in the Strait of Magellan and at the Falkland Islands 
during the cruise of the “Nassau ” between 1866 and 1869. Cunningham’s description^ 
refers only to the external characters, so I have supplemented it by the necessary details 
of the internal structure. 
The colonies of this genus form large masses which may be disc-shaped, pyriform, or 
elongated. They are sometimes sessile {Goodsiria coccinea), and in other cases shortly 
pedunculated {Goodsiria placenta), while in one of the specimens of Goodsiria 
pedunculata a very long peduncle is present. The area of attachment is always small. 
Cunningham has figured the short-bodied ovate or fiask-shaped Ascidiozooids with the 
alimentary viscera placed alongside the branchial sac, a character which distinguishes this 
genus from Thylacium, Carus. The Ascidiozooids are completely imbedded in the test, 
which forms a thick solid mass. Bladder cells are never present in the test, and the usual 
test cells are small and inconspicuous. The vessels branch and terminate in dilated bulbs. 
1 Trans. Linn. Soc. Land., vol. xxvii. p. 465. 
