360 Mr. A. Hancock on new Species 
tinated particles of sand and shell, chiefly towards the margins 
of attachment. Mantle well supplied with interwoven mus- 
cular fibres. Zentacular filaments numerous and rather stout. 
Branchial sac narrow, with large papille at the intersections 
of the meshes, and small intermediate ones. Ventral plait 
wide, strongly ribbed; margin pectinated, and bordered on the 
left side with a band of tubercles. Length nearly 2 inches. 
We are indebted for the knowledge of this species to Dr. 
Bowerbank, who obtained a single individual of it at Hastings. 
It is allied to A. plebeia, but differs from that species m many 
respects, and may at once be distinguished by the narrowness 
of the mantle and branchial sac, and likewise by the charac- 
ters of the branchial papille and ventral plait. 
Ascidia producta, Hancock. 
Body much elongated, pyriform, depressed, attached by the 
entire length, of a pale green colour. Apertures tubular; the 
ranchial one a little produced and turned towards the ventral 
margin; the anal three-fourths down, near the ventral 
margin: ocelli red. Test rather thick, pellucid, cartilaginous, 
covered with minute, distant, conical papille. Mantle delicate, 
of a full dark green, with the branchial tube considerably pro- 
duced, terminal; the anal short and turned backwards. Ten- 
tacular filaments numerous, slender. Branchial sac minutely 
plicated, with moderate-sized papille at the intersections of 
the meshes. Ventral plait narrow, pectinated, ribbed, and 
tuberculated on the left side. Length 24 inches. 
The Rev. A. M. Norman dredged this species in the Minch, 
in 1866, and also found it at extreme low-water during spring- 
tides in Strangford Lough, 1869. 
A. producta evidently belongs to that group of which A. 
depressa and A. inornata are typical, but has many characters 
to distinguish it from all of them. 
Ascidia elongata, Alder & Hancock. 
Body elongated, slender, transparent, nearly colourless, 
attached slightly at the side of the base; the branchial aper- 
ture terminal, the anal about two-thirds down. Test hyaline, 
minutely tuberculated, the tubercles rather distant and pointed. 
Tentacular filaments numerous, long, and slender. Branchial 
sac with obtuse papille, minutely plicated; the stomata ellip- 
tical. Ventral plait ribbed, rather narrow. Length about two 
inches, breadth half an inch, 
single individual of this species was dredged in Seaham 
Harbour by Mr. Geor; 
» George Hodge. ue 
A, elongata is evidently related to A. aculeata, but it is 
