1 



602 PKOF. W. A. HEEDMAN S EEVISED 



Gonads placed in the intestinal loop, the spermatic vesicles 

 forming a crescentic curve around the ovary. 



This genus contains four species, vs^hich may be separated as 

 follows : — 



/Tentacles about 40 in number E. diaphanis, Sluit. (Mai.) 



[Tentacles about 80 in number 1 



I' Dorsal languets and connecting-ducts wide and membranous. 



E. Moorei, Herdm. (Med.) 

 Dorsal languets and connecting-duets narrow and papilliform 2 



(Tentacles of 3 lengths, languets separate. 

 E. turbinata, Herdm. (N. Atl.) 

 Tentacles not distinctly of 3 lengths, languets united by a narrow 

 dorsal membrane E.Thurstoni,'S.Qy:dim. (Ind. O.) 



Ascidia daviformis, Lesueur* (W. Ind.), probably belongs to 

 this genus, but is not sufficiently characterized. 



Peeophoea {Lister, 1834), Wiegm., 1835. 



Body short, not divided into thorax and abdomen, attached by 

 a short peduncle to a creeping stolon. 



Test thin and transparent. B ranchial aperture 6-lobed, atrial 

 5-lobed, ratber distant. 



Branchial sac with connectiog-ducts wMch may branch to 

 form imperfect internal longitudinal bars. About 4 rows of 

 stigmata present. 



Dorsal lamina more or less of a membrane bearing narrow 

 languets. 



Alimentary canal placed on the left side o£ the branchial sac. 



This genus contains 3 or 4 species t, as follows : — 



I Ascidiozooids on distinct pedicels which are jointed; some adhering 



I sand on test P. Hutchinsoni,M.Sicd. (Austr.) 



1 Ascidiozooids not on distinct pedicels, no jointing present, no adhering 



[ sand .'. 1 



f Body colourless, 40 tentacles of 3 sizes, only papilliform connecting 

 I duets P. Listed, Wiegm. (Atl., ? Med.) 



1 ■{ Body greenish, 20 tentacles of 2 sizes, papilliform connecting-ducts 



■ I with rudimentary internal longitudinal bars. 



L P. viridis, Yerr. (E. N. Am.) 



[?=P. bani/ulensis, Lah. (Med.).] 



Peeophoeopsis, Lahille. 



Body nearly cylindrical, sessile. Branchial aperture 12-lobed, 

 atrial G-lobed. 



* Journ. Acad. N. S. Philadel., April 1823, vol. iii. p. 5. 

 t Giard has named a species from Eoscoff, P. fragilis. It has not yet, I 

 beUeve, been sufficiently described. 



