| OCR Text |
Show 1869.] DR. W. BAIRD ON NEW ANNELIDES. 313 with rather narrow circular bands of dark brown on a yellowish ground. W e possess only one specimen of this species. It was collected in Possession Bay, Patagonia, by Dr. Cunningham, naturalist to the late Surveying Expedition to the Straits of Magellan. Length of body about 2 inches, breadth (at broadest part) about 4 lines. 3. PONTOBDELLA VARIEGATA, Baird. Body cylindrical, somewhat fusiform, much attenuated at the anterior extremity. Posterior extremity the larger in circumference, gradually tapering towards the head. Segments covered with smooth, conical, rounded warts, of nearly uniform size. The neck is composed of 10 or 11 segments, and is separated from the body by five narrower ones, all the segments being slightly warty. The acetabulum is considerably larger than the head, which is smooth on its margin, having no nodules round the rim. The body is marked with spots of a deeper brown colour on a yellowish ground, and the acetabulum is rayed with the same hue. W e possess two specimens,-one iu very good preservation from the Straits of Magellan, presented by the Lords of the Admiralty; the other from Possession Bay, Patagonia, collected by Dr. Cunningham along with the preceding species. One specimen (somewhat contracted) measures about 2\ inches in length, the other (more relaxed) is nearly 3 inches long; circumference (at the broadest part) 1| inch. 4. PONTOBDELLA RAYNERI, Baird. Body cylindrical, much attenuated at the anterior extremity. Segments surrounded with raised conical warts, each wart having several small warts on its summit. The neck is elongated, and surrounded, as is the body, with warts. It consists of 12 segments, and is almost continuous with the body, being slightly separated from it by five warty rings. The acetabulum is larger than the head, faintly rayed with brown, and somewhat puckered round the margin. The head is small, circular, and the margin has six small conical papillae. On the side of the head are two well-marked brown spots, somewhat triangular in shape. The warts on the body are so arranged as to present one row of large ones, and two rows of smaller ones succeeding it; that is to say, every third row of warts is the largest. When relaxed, the length is about 1 inch ; when corrugated by the spirit it diminishes one-fourth. Hab. Found on a species of Rhinobatis in Sharks' Bay, Australia. Collected by Mr. Rayner, Surgeon H.M.S. ' Herald.' Genus AULASTOMA, Moquin-Tandon. 1. A U L A S T O M A P L A N U M , Baird. Body flattened, slightly convex dorsally, very flat ventrally, at- |
