TUNICATA 



659 



O. 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. FBITILLARIA 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 Kowalevskia tennis (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- 

 fonn: 2 species. 



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



