CLASSIFICATION OP THE TCTNICATA. 051 



Probably tliis genus, in the restricted sense, contains only two 

 or thx-ee species. The only one sufficiently described is Appendi- 

 cularia sicula, Fol (Med.). 



OiKOPLEUEA {Mertens, 1831), Fol, 1872. 



Body ovoid, contracted ; no hood present. 



Tail long, measuring from tbrice to four and a half times the 

 length of tbe body. It is about four to six times as long as it is 

 broad. 



Endostyle straight. 



The following are the better-known species of this genus. A 

 number of others which have been named or referred to cannot 

 be placed. The first-known species was Oihopleura Chamissonis, 

 Mertens (N. Pac). Another form frequently referred to is 

 O.flabellum, J. Miill. 



/The "Haus " almost globular 1 



\ The " Haus " not globular, usually ovate 2 



, J With a pre-aual fold of integument ... 0. spi$sa,Vo\. (Med.) 



I With no pre-anal fold 0. speciosa, Eisen. (N.W. Eur.) 



n f Stomach and intestine of a bluish or violet colour 3 



\ Alimentary canal not blue or violet 4 



o ( Body 1 mm. long 0. dioica, Fol. (Atl. & Med.) 



\ Body 0'2-0'5 mm. long 0. cesrulescens, Geg. (Med.) 



. [Body 1 to 2 mm. long 5 



\ Body about 4 mm. long 0. cophocerca, Greg. (Med.) 



f, r Body 1 -8 mm. long 0. riifescejis, Fol. (Atl., Med.) 



\ Body 1"1 mm. long 6 



{Body elongated, narrow, tail rather wide, mouth directed upwards. 

 0.fi<sifor?nis,Fol. (Atl., Med.) 

 Body ovato-elongate, tail very narrow, mouth directed forwards. 

 0. albicans, Leuck. (Med.) 



Stegosoma, Chun, 1888. 



Body rhomboid, depressed. 



Endostyle moderately large. 



Stomach and intestine, forming an arch over the liver. 



This contains a single form named by Chun. 



Feitillaria (Q. &( G. 1833), Fol, 1872. 



Body elongated, more or less constricted in tlie middle where 

 the tail is attached. A fold of integument on the front of the 

 body forms a " hood." 



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



Endostyle curved. 



