MONASCIDIA. 



27 



Pharynx with internal longitudinal bars and straight stn/ma/a, 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 E u r . ; 

 Pachylaena Herd. , 

 test hard. 



P h a r ij n x a s 

 above, dorsal lamina 

 as languets. 



dona F 1 e m . 

 (Figs. 1, 3, 1, GA, 

 11, 13, 14), viscera 

 posterior to phar- 

 ynx, tunic gelatin- 

 ous, renal cells 

 grouped near tl it- 

 generative orifice, 

 C. intestinalis L. 

 most seas. Rhodo- 

 oma E h r e n b erg 

 (Chev reulius L.- 

 Duth.) (Fig. ID), 

 test folded at the 

 anterior end jso 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,(KlOfms., 

 viscera on either 



right or left side of FIG. 19. 1. Holgula (Anurella) so.'enota. from the right side (nat. 



nharvnv size). ^1 atrial pore, B mouth, at the end of papilliform prominences 



Ti, Ti ; ai, r alimentary canal: /s, f* liver ; r reproductive gland?. 



Pharynx with 2. Boltenia wiformis x j. 3. Rliutlnxnitin (Chevreulius) callense x 3 ; 

 internallongiludinal a moutll: n 8 an 8 lion : o atrial aperture ; y operculum (from Perrier). 



bars, curved stigmata and viscera on right side of pharynx, </</(/ lamina 

 as languets. 



Corclla Aid. and Han., test soft, seas of Eur., Japan etc. (Jhetyosoma Jb'rocl. 

 and Sow., test modified into horny plates. Corynascidia Herd., as above, 

 but with viscera dorsal to pharynx and a stalk, deep sea, 1,000 to 2..0UO 

 fins. 



