120 TUNIC AT A. BOTBYLLARIA. 



ed, rough with small papillae ; the greater part forming stel- 

 liform systems, and disposed in a radiated form round a cen- 

 tral opening ; mouth with six tentacula ; anal aperture not 

 apparent without ; one gemmiferous sac hanging under the 

 animal, terminated by a filament. 



P. violaceum, Lam. Inhabits seas of Europe Lam. iii. 105. 

 Gen. 5. DIAZOMA, Lam. 



Animals aggregated, biforous, forming by their union a com- 

 mon body, fixed, semigelatinous, orbicular, multicellular, with 

 the cells projecting, compressed, each provided with two ori- 

 fices and disposed in many concentric circles ; six lanceolate 

 tentacula at the mouth. 



D. Mediterranean Lam. Animals about 1 inch long. Inhabits the 

 Mediterranean. Lam. iii. 102. 



Gen. 6. DISTOMUS, Lam. 



Animals biforous, separate, living in a subcoriaceousmass, extend- 

 ed in a crust, and covered with scattered warts ; two orifices 

 on each wart, margined with six teeth. 



D. variolosus, Lam. (Alcyonium ascidioides, Gmel.) Colour pale 

 red or whitish orange, with the warts scarlet red at the orifices. In- 

 habits British coasts, adhering to Fit cits palmatus Lam. v. 101. 



Gen. 7. SIGILLINA, Lam. 



Animals biforous, forming by their union a common gelatinous 

 body, conical-elongated, subpediculated, with scattered tu- 

 bercles; no particular or distinct systems formed by the dispo- 

 sition of the animals; tubercles of the surface with two pores; 

 six tentacula at the mouth, and six teeth at the anal orifice. 



S. Australis, Lam. Inhabits coasts of New Holland Lam. v. 100. 

 Gen. 8. SYNOICUM, Lam. 



Aggregated animals living in cylindrical fleshy projections, ob- 

 tuse at the summit, and arising from a' fixed base ; six to 

 nine osculi disposed circularly at the apex. 



S. turgensj Lam. With many simple cylindrical fleshy projections, 

 and osculi disposed in a circular form at the apex. Inhabits coasts 

 of Spitzbergen Phipps, Voyage, pi. 12. fig. 3. 



Gen. 9. EUCOSLIUM, Lam. 



Animals biforous, aggregated, living in a common mass, extend- 

 ed in the form of a spongy or subgelatinous crust, with scatter- 

 ed mammillae at the surface ; only one apparent opening with- 

 out ; gemmiferous sac single and lateral. 



The common crust of this genus is whitish, extended over marine bodies, and co- 

 vered with small papillae, either crowded or in. quincunx order. Their summit is 

 pierced by an opening, of which the margin is dividedinto six rays, sometimes scarcely 

 perceptible, The body of the animalcule is divided into two unequal inflations, 

 forming two distinct cavities. The gemmiferous sac is lateral. 



