312 DR. W. BAIRD ON NEW ANNELIDES. [May 13, 
EUBRANCHELLA BRANCHIATA. 
Hirudo branchiata, Menzies, Linn. Trans. i. 188, tab. xviii. fig. 3. 
Polydora testudinum, Oken. 
Branchellion pinnatum, Savigny, Grube. 
Branchiobdella menziesi, De Blainville, Diesing. 
This, as far as I am aware, is the only species of this genus known. 
Savigny was the first to recognize it as belonging to a different genus 
from Branchellion. Diesing and Moquin-Tandon appear to con- 
sider the species doubtful; but Mr. Rayner, Surgeon of H.M.S. 
‘ Herald,’ succeeded in taking it from a turtle in Sharks’ Bay, Aus- 
tralia, eleven or twelve years ago. ‘The animal is only half an inch 
long. 
Genus PontosBpE.ua, Leach. 
1. PonrospELLA AFRA, Baird. 
Body cylindrical, ventricose in the middle, attenuated at each ex- 
tremity, slightly posteriorly, but more so anteriorly. Segments en- 
circled with a series of rather large warts, each wart being circular 
in form, rather flattened, and covered with a series of smaller warts 
or minute tubercles on its centre. The neck consists of 12 segments, 
every third one being the largest and warty, the intervening ones 
quite smooth, and is separated from the body by five narrow smooth 
segments. The acetabulum or ventral sucker is much larger than 
the head, which is very small in comparison and armed on its 
margin with six rather small nodules or conical tubercles, three on 
each side. 
The postoccipital segment is armed with a row of similar small 
conical tubereles, differing from the warts on the body. The colour 
of this Leech is a dark olive, or of a blackish hue. 
The worm is about 4} inches long, and the largest portion of 
the body is about 27 inches in circumference. 
The only specimen the Museum possesses is ticketed “San 
Vicente,’ and was presented to the collection by the Rev. R. T. 
Lowe, late of Madeira. 
2. PonroBDELLA PLANODIsSCUS, Baird. 
Body much flattened, attenuated at the anterior extremity. Seg- 
ments surrounded with a row of conical raised warts, each wart 
having two or three small nodules on the upper surface. The neck 
consists of 12 segments, all of which are warty, the warts, however, 
being much smaller than those of the body, from which it is sepa- 
rated by five warty rings. The acetabulum is considerably larger 
than the head, is quite plane, not hollowed at all, and rayed exter- 
nally with numerous rather broad bands of brown. The head is 
small and puckered round the edges, and has six small conical papillz 
on the margin, three on each side, not in a line with each other 
but set in a triangular manner, two on the same plane, the third, 
forming the apex of the triangle, at some little distance from the 
margin. The body is marked on the anterior portion and the neck 
