362 Mr. A. Hancock on new Species 
filaments rather long, white, wide at the base, distant, alter- 
nately large and small, not very numerous. Branchial sac 
minutely plicated ; stomata long; papille confined to the in- 
tersections of the meshes, delicate, scarcely (if at all) produced. 
Ventral plait well developed, ribbed, margin entire; the left 
oral appendages five or six, denticulated, flat, placed diago- 
nally. Length sometimes 24 inches, but usually under 2 inches. 
Several of this pretty species were collected by the Rev. 
. M. Norman in 1869, between tide-marks in Strangford 
Lough; and lately Mr. A. G. More has sent to us several spe- 
cimens of it dredged by himself in Bertraghbuy Bay, Conne- 
mara. e have received it also from Mr. Robertson, who 
obtained three or four individuals in the Frith of Clyde. 
- We have named this species after our friend the Rev. A. M. 
orman, to whom we are indebted for a great number of new 
forms of both the simple and compound Tunicata. 
Genus CORELLA, Alder & Hancock, MS. 
aperture. Reprod 
duct following the line of the intestine. ; 
The above genus was characterized some time previously to 
the death of my late collaborator, Mr. Alder, for the reception 
of the so-called Ascidia parallelogramma, which differs in so 
many important characters from the species with which it was 
associated that we deemed ourselves justified in making the 
change. It is a sinistral animal; the alimentary tube is very 
differently disposed from that of Ascidia; the heart occupies a 
different position; and, above all, the spiral arrangement of the 
secondary branchial vessels seems sufficient to warrant the 
establishment of this genus. 
X Since then two very interesting species have been discovered 
which agree in all essential characters with the type form, 
thus justifying the reete of Corella parallelogramma from 
h it 
the genus with which it was placed. 
