REPORT ON THE TUNICATA. 103 



I. Apj^endicularia, Cliamisso (1821), emend. Fol (1874). 



Bocb/ contracted, depressed anteriorly, swollen posteriorly. No hood 



present. 

 Tail measuring twice to thrice the length of the body. 

 Endostyle slightly curved. 



Rectum enormous, larger than stomach and intestine together. 

 Of this genus in the restricted form only two or three species have been 



described. 



II. Oikoplenra, Mertens (1831). 



Body ovoid, concentrated. No hood present. 



Tail measuring thrice to four and a half times the length of the body. It 



is about four to six times as lono- as it is broad. 

 Endostyle straight. 

 This genus contains about a dozen species. 



III. Fritillaria, Quoy and Gaimard (1833), emend. Fol (1872). 



Body elongated, more or less narrowed in the middle where the tail is 



attached. Hood present. 

 Tail short and wide, about once and a half as long as the body. 

 Endostyle curved. 

 This genus contains al)0ut half a dozen species. 



IV. Kowalevskia, Fol (1872). 



Body ovoid, truncated anteriorly. 

 Tail large, lanceolate and pointed. 

 Endostyle and heart absent. 

 Pharynx with four rows of ciliated processes. 

 This genus contains one species, Koivalevshia tenuis, Fol. 



The genus Vexillaria, J. MuUer, is a synonym of Oikopleura ; and Eurycerciis, 

 Busch, is a synonym of Fritillaria. 



As Appendiculariidae were not specially looked for or preserved during the 

 expedition, the Challenger collection contains only a few specimens, and these were all 



