TUNICATA. 105 



globose, coriaceous, rugose ; dirty yellowish or greenish ; apertures 

 tubular, distant ; with four broad rosy white stripes. 

 Common. 



* 2. A. janthinOCtoma, Quoy, I.e., iii., p. 610. Upright, white ; 

 apertures distant, marked with four violet lines ; oral branchiae long, 

 erect. 



Eiver Thames (Quoy). 



* 3. A. C88rulea, Quoy, I.e., iii., p. 611. Globose, white below ; 

 apertures blue, distant, with two violet lines ; anal branchiae longer. 



Bay of Islands (Quoy). 



BOLTENIA. 



Globular, pedunculated ; test coriaceous ; orifices lateral, 4-eleffc ; 

 branchial sac longitudinally plaited ; tentacles compound. 

 Greenland and New Zealand. 



4. B. pedlinculata, Milne-Edwards. Body with six longitudinal 

 folds, more or less tuberculated, especially in young individuals ; 

 peduncle wrinkled, occasionally branched. Whitish, more or less 

 tinged with pink. 



Coasts of the South Island. 



BOTRY.LLID.E. 



Animals compound, fixed, their tests fused, forming a common mass 

 in which they are imbedded in one or more groups ; individual not 

 connected by any internal union ; oviparous and gemmiparous. 



BOTRYLLUS. 



Test gelatinous or cartilaginous, incrusting ; systems numerous, 

 prominent, round or star-shaped, with central cavities ; individuals six 

 to twenty in each system, lying horizontally, with the vent far from 

 the simple branchial orifice. 



Europe. North America. 



* 5. B. raceniOSUS, Quoy, I.e., iii., p. 620. Ovate, pedunculated, 

 fleshy, red, many branches together ; animal radiate. 



Eiver Thames (Quoy) . 



FAMILY PTROSOMID^E. 

 Animal compound, free, pelagic. 



PYROSOMA. 



Cartilaginous, non-retractile, cylindrical, hollow, open at one end 

 only ; exterior covered by numerous pointed zooids, grouped in whorls ; 

 interior marnillated and pierced by the exhaleut orifices of the tunicaries. 



All warm seas. 



6. P. atlantica, Lamark, I.e., in., p. 510. Cylindrical, narrowed 

 towards the closed end ; both ends rounded ; rather thick ; zooids 

 crowded, short. Brownish yellow. Length, 5 ; breadth, 1'75. 



7. P. elegans, Lamark, I.e., iii., p. 510. Cylindrical, rounded at 



14 



