706 CLASS XI. 
(the figures relating to this memoir were also given, better executed, in 
Pt. X. of the Nov. Act. Acad. Cus. Leop. Car. 1821, p. 423);—W.S. Mac 
Lray Anatomical Observations on the Tunicata, Linn. Trans. X1v.1825, pp. 
527—855;—PHILIPPI Rhopalwa ein neues Genus der einfachen Ascidien, 
Mun.uer’s Archiv, 1843, pp. 45—57 (which memoir contains some notices 
on different simple Ascidians found by the author near Naples), 
A. External tunic gelatinous. Two orifices, either without 
distinct rays, or furnished with more than four rays. 
Perophora WieGM. Body compressed, sacciform, placed by 
means of a short petiole on a creeping tube, connecting several 
individuals. Branchial sac ample, produced to the posterior part of 
body. . 
Sp. Perophora Listeri, a small animalcule living socially, fixed on Conferva 
elongata by a creeping, cirrus-bearing pedicle: found by ListER on the 
English coast, Phil. Trans. for 1834, Pt. 2, pp. 378— 382, Pl. x1. In the 
pedicle, connecting the animal, a double blood-current was observed. The 
name Perophora is given to this genus of Ascidia by WIEGMANN in his 
Report on the Advancement of Zoology in 1834, Archiv f. Naturgesch. 1835, 
I. 8. 309. 
Clavelina SAv. Branchial and cloacal pore without rays. Bran- 
chial sac short, destitute of papille, not plicated. Body oblong, 
attenuate at the base, petiolate. 
Sp. Clavelina borealis Sav., Ascidia clavata Pauu., Spicil. Zool. x. Tab. 1. 
fig. 16, Sav. 1.1. Pl. 1. fig. 3, Pl. x1. fig.2. In the North and Polar seas; 
Clavel. lepadiformis Sav., Ascidia lepadiformis O. F. MuxntuEr, Zool. 
Dan. Tab. 79, fig. 5, MinNE Epwarbs Observ. (Asc. Tab. 1. fig. 1. Tab. 11. 
fig. 1, &e. 
Sub-genus: Rhopalea Puteri. Branchial pore sexradiate, anal 
octoradiate. Branchial sac short, beset with papille, with transverse 
strie subindistinct. Body elongate, clavate, petiolate, with covering 
pellucid. 
Sp. Rhop. neapolitana Pururrt |. 1. Tab. Iv. 
Phallusia SAv. Body sessile, mostly oblong. Branchial pore 
mostly with eight or nine radu, cloacal pore sexradiate. Branchial 
sac not plicated, ample, descending to the bottom of internal tunic 
or reflected at the bottom. 
Sp. Phallusia mammillata, Ascidia mammillata Cuv. Mém. s. l. Ascidies. 
Plu. R. Ani., éd. ill., Moll. Pl. 125, fig. 1; in the Mediterranean. The 
thick, white, gelatinous, semi-transparent external tunic presents under the 
microscope large oval vesicular cells, without nuclei; this species attains 
a size of more than 4 inches, &e. 
