MONASCIDIA. 



27 



Pharynx with internal longitudinal bars and straight stigmata, viscera on 

 the left side of pharynx, dorsal lamina as a membrane. 



Ascidia L. (Figs. 

 2, 12), test soft, A. 

 mentula O.F.M. ; 

 Phallusia Sav., P. 

 mammillata Cuv. , 

 pharynx recurved 

 on itself posteriorly 

 on the left side, 

 Seas of Eur.; 

 Pachylaena Herd., 

 test hard. 



Pharynx. as 

 above, dorsal lamina 

 as languets. 



Ciona F 1 e ni . 

 (Figs. 1, 3, 4, 6A, 

 11, 13, 14), viscera 

 posterior to phar- 

 ynx, tunic gelatin- 

 ous, renal cells 

 grouped near the 

 generative orifice, 

 C. intestinalis L. 

 most seas. Rhodo- 

 S oma Ehrenberg 

 (Chev reulius L.- 

 Duth.) (Fig. 19), 

 test folded at the 

 anterior end L so as 

 to form a kind of 

 bivalve operculum 

 covering the mouth 

 and atrial opening, 

 viscera on right 

 side, Med. Abyssas- 

 cidia Herd., at- 

 tached by ventral 

 surface, apertures 

 far apart, deep-sea, 

 2,000 to 2,600fms., 

 viscera on either 

 right or left side of FIG. 19. 1. Molgula (Anurella) solenota, from the right side (nat. 

 size). A atrial pore, B mouth, at the end of papilliform prominences, 

 pharynx. Ti> Ti . ai> r alimentary canal : /3, /* liver ; T reproductive glands. 



Pha rynx with z < Boltenia oviformis x |. 3. Rhodosoma (Chevreulius) callense x 3 ; 

 jj . ,. , a mouth; n ganglion ; o atrial aperture ;y operculum (from Perner). 



bars, curved stigmata and viscera on right side of pharynx, dorsal lamina 

 as languets. 



Corella Aid. and Han., test soft, seas of Eur., Japan etc. Cfielyosoma Brod. 

 and Sow., test modified into hornyplates. Corynascidia Herd., as above, 

 but with viscera dorsal to pharynx and a stalk, deep sea, 1,000 to 2,000 

 fms. 



