618 PEOF. w. A. heedman's eevised 



papilliform projections nearly as uumerous as tlie stigmata. 

 About a dozen rows of stigmata. No internal longitudinal 

 bars. 



Dorsal languets present. 



Alimentary canal with the intestinal loop twisted. Stomach 

 smooth. 



There are two species of Glosso^liorum : — 



C Colony small, globular ; 32 tentacles ; atrial languet lobed. 

 J G. sabidosum, Giard. (N.W. Eur., Med.) 



I Colony large, flattened; 16 tentacles ; atrial languet simple. 

 [ G. humilc, Lah. (Med.) 



The Amaroucium hilaterale of Griard (N.^V. Eur., 1874) pro- 

 bably belongs to this genus. 



Aplidiopsis, LaMlle, 1890. 



Colony subglobular, attached, sessile. Systems irregular or 

 indistinct. Branchial aperture 6-lobed, atrial imperfectly lobed. 



Ascidiozooids divided into thorax, abdonien, and postabdomen. 



IBranchial sac with numerous stigmata. 



Alimentary canal with no twisting of the intestine. Storaacli 

 smooth. 



Fostahdomen not separated off from abdomen by a constric- 

 tion. 



The following species may be referred to tliis genus : — 



r Stigmata very small A. incer(us, Herdm. (Mag.) 



[ Stigmata well developed 1 



1 f Stomach globular A. viireus, Jjah. (Med.) 



\ Stomach pyriform _ 2 



o f Stomach placed vertically : A. inmuttcs, HerAm. (South. O.) 



[ Stomach placed horizontally A. pyriformis, Herdm. (South. O.) 



Aueantium:, Giard, 1872. 



This genus, or subgenus, seems to differ from Folyclinum 

 merely in having the systems compound. It contains a single 

 species, A. aurantium {^Polyclinum aurantium), M.-Edw., wliich 

 is possibly identical with Sidnyum turlinatum of Savigny. 



This group is probably scarcely of sufficient importance to 

 warrant its separation from Folyclinum. 



POLTCLINUM, Savigny, 1816. 

 Colony massive, usually sessile. 

 Systems simple or compound, often irregular. 



