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Show 312 DR. W. BAIRD ON NEW ANNELIDES. [May 13, EUBRANCHELLA BRANCHIATA. IHrudo branchiata, Menzies, Linn. Trans, i. 188, tab. xviii. fig. 3. Poly dor a testudinum, Oken. Branchellion pinnatum, Savigny, Grube. Branchiobdelta 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 consider the species doubtful; but Mr. Rayner, Surgeon of H.M.S. * Herald,' succeeded in taking it from a turtle in Sharks' Bay, Australia, eleven or twelve years ago. The animal is only half an inch long. Genus P O N T O B D E L L A , Leach. 1. P O N T O B D E L L A AFRA, Baird. Body cylindrical, ventricose in the middle, attenuated at each extremity, sliglitly posteriorly, but more so anteriorly. Segments encircled 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 tubercles, 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 2 | 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. PONTOBDELLA PLANODISCUS, Baird. Body much flattened, attenuated at the anterior extremity. Segments 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 separated by five warty rings. The acetabulum is considerably larger than the head, is quite plane, not hollowed at all, and rayed externally with numerous rather broad bands of brown. The head is small and puckered round the edges, and has six small conical papillae 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 |
