TUNICATA 



659 



0. flabellum Huxley {0. huxleyi Ritter). Length up to 12 mm., of 

 which 10 mm. is tail: Pacific and Atlantic Oceans. 



O. cophocerca Gegenbauer (Fig. 1,001, A). Length 11 mm., of 

 which 8 mm. is tail; a long double row of cells on right side of tail: 

 Mediterranean Sea. 



3. Fritillaria Fol. Trunk very long, usually constricted near the 

 middle and with an extensive dorsal ectodermal fold which covers it 

 like a cowl; tail about 1.5 times as long as the trunk and 2.5 times as 



Fig. 1,002 



Fig. 1,003 



Fig. 1,002- 



-Fritillaria furcata (Fol). Explanations as in Fig. 1,000. 

 Fig. 1,003 — Kotvalevskia tenuis (Fol). 



long as broad; endostyle bent; tunic absent or not well developed; 

 digestive tract small, confined to the middle of the trunk; ovary spher- 

 ical, testis large and saccular, in hinder part of trunk, both usually 

 single: about 8 species. 



F. furcata (Vogt) (Fig. 1,002). With long posterior processes; 

 tail forked at its extremity : Mediterranean Sea ; North Atlantic. 



Family 2. KOWALEVSKIIDAE. 



Pharynx without endostyle and periphryngeal ridges; heart absent: 

 1 genus and 2 species. 



KoWALEVSKiA Fol. Trunk elongate, cylindrical; tail about 7 times 

 as long as trunk and lanceolate, running to a point behind; tunic very 

 thin and delicate; oesophagus very wide; ovary spherical; testes reni- 

 form: 2 species. 



K. tenuis Fol. (Fig. 1,003). Mediterranean Sea and Atlantic Ocean. 



