CLASSIFICATION OP THE TUNICATA. 585 



{Alimentary canal forms a very wide loop, open dorsally. 

 P. patens, Sluit. (Mai.) 

 Alimentary canal not forming a wide loop. 

 P. Haddoni, n. sp. (Austr.) 



go \ Colour dark, though not black ... P. nebulosa. Heller. (Austr.) 



I Colour light, yellowish or greyish white -il 



r Anus fringed, stomach ovate , P. argoensis, Herdm. (N.W. Eur.) 



41 ^ Anus not fringed, stomach elliptical. 



[ P. gracilis, Heller. (Med.) 

 oy /Test tough and leathery 42 



I Test soft, may be thick 43 



r Dorsal tubercle spongy and irregular. 

 43 j P. sulcata, Kcvdm. (Mill) 



[Dorsal tubercle not spongy, normal 44 



r Dorsal tubercle circular in outline. P Tnollis, 'Keller. (?) 

 44-^ Dorsal tubercle irregularly S-shaped. 



[ P. elongafa, n. sp. (Austr.) 



A.y f Tentacles all one length P. rigida, Herdm. (Austr.) 



^ \ Tentacles of different lengths 45 



Ap- f Meshes divided by a horizontal vessel 4(i 



I Mcihes not divided horizontally 47 



^Y r Stigmata 6-8 in a mesh 48 



I Stigmata 10-12 in a mesh P. Bassi, Herdm. (Austr.) 



AQ f Test thick and tough 49 



\ Test thin P. torresiana, n.sp. (Austr.) 



^q f Coloiir dirty yellowish white P. inrgidans, Herdm. (Mai.) 



\ Colour dark purplish brown 50 



I Inner surface of mantle with minute brown pigment-spots. 



P. ts7ica, n. sp. (Austr.) 

 Inner surface of mantle without pigment-spots. 



P.ftdva, n. sp. (Austr.) 



Af. f Siphons prominent and conspicuous 51 



\ Siphons not prominent or conspicuous 52 



f Test thin ; stigmata 7-8 in a mesh. P. Mayeri, Traust. (Med.) 



61 \ Test thick and opaque ; stigmata 3 in a mesh. 



[ P. aspera, Herdm. (S. Atl.) 



Ko /Body cylindrical, colour red P. 7-ustica,limio.. (IS .W.Eur.) 



I Body not cylindrical, colour brownish 53 



r Inner surface of test pearly grey-white ; stigmata 10-12 in a mesh. 



J P. varians. Heller. (Med.) 



I Inner surface of test light brown, with dark specks ; stigmata 7-9 in a 



50 



nesh P. fastigata, n. sp. (Austr.) 



The following species of Cyntliiidae liave been so insufficiently- 

 described tliat it is impossible to say with certainty which genera 

 they belong to : — 



Cynthia quadravgularis, Forb. (N.W. Eur.) 



C. informis, Forb. (N.W. Eur.) 



C. limacinci, Forb. (N.W. Eur.) [? Forbcsella.'] 



C. ma7nmillaris, Balhis. (N.W. Eur.) 



C. amjmlla, Drug. (N.W. Eur., Med.) 



42* 



