393.] 0VERSIGT OVER NORGES ASCIDIAE SIMPL1CES. 89 



The body strongly compressed from the sides, and fast 

 rown on the whole of the left side. 



The testa cartilaginous, transparent, covered with numerous 

 rocesses. The testa is greatly diffused on the underlayer, so 

 tat there is generally a testa brim of about 5 mm. outside 

 le inner body. The arteries are largely diffused on" the left 

 i a similar manner to those of A. minuta, though they branch 

 it much more numerously towards the testa brim, and here 

 ; id in somewhat irregular, long, and slightly extended cucur- 

 ts. The arteries are not dark coloured. Both oriflces heel 

 uch over on the right side; the lips of the mouth orifice 

 e finely dentated; more than 30 tentacles of two sizes. The 

 orsal tubercle round, or longer than broad, the horns slightly 

 Int inwards; the nerveganglion lie close behind the dorsal 

 bercle. The dorsal fold slightly dentated. No postbucal 

 >»rsal fold. Internal longitudinal bars fine, without, or 

 \th Very small papille upon the crossing of the logitudinal 

 i d transverse bars. 5 — 8 long spiracles in each mesh. The 

 tt forms a high slanting twist. Anus considerably lower 

 lan the gut. The kidney concrements besides being diffused 

 i the gut right of the anus, also outside it; resembles the 

 ( rresponding in A. aspersa, 0. F. M. The whole of the interior 

 iatomy reminds one much of A. aspersa, 0. F. M. 



Ascidia gelatinosa, nov. sp. 

 (Fig. 1—5 & 46—47). 



The body is more or less flattened, and forms an elongated, 

 snewhat irregular square, is fast grown with a large or small 

 mt of the left side. 



The testa is very thick, of a characteristically soft nature, 

 a 1 closely furnished with very small processes. Glose to the 

 gj near its upper bend, the arteries go over into the testa 

 a usual, and there at once divide into 4 main branches for 

 oeiwards to branch off wery liberally and finely on both 

 s es of the body. This form is very variable in its exterior; 

 I istingvish two varieties which, however, go over into each 



