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Show 1904.] EARTHWORMS FROM NEW ZEALAND. 225 O ctoch.etu s MiCHAELSEXi. sp. n. (Text-fig. 45.) A single individual of this worm was collected by Capt. F. W. Hutton at Wellington. It was broken into four or five pieces when I received it ; in general appearance it agrees with other species of the genus Dimensions. About 210 x 8 mm.; the number of segments was not counted, as the worm was too greatly contracted and broken to make the attempt profitable. The clitellum, though not fully developed, appears to cover segments 15 to 19. The porophores are in line of b, as also are the spermathecal pores, and their position on the body is lateral rather than ventral, though of course on the under side. The chceta> have the usual spaced arrangement, and, in spite of examination of the skin, I was unable to detect them in front of the tenth segment. The arrangement is as follows: cl is a little above the lateral line, so that d -cl is about 5 of the circumference, aa = ccl= 1| ab; ab = bc. The gap aa is wider in the clitellar and preclitellar segments than posteriorly. Internal Anatomy There are seven very stout septa, the last being behind the 12tli segment. The doi'sal vessel is double as far forward as segment 8, and the last heart is in the 13th segment. Text-fig. 45. OctocJieetus michaelseni.- Spermatlieca (X 12): the diverticulum is represented by-several small saccules (D) embedded in the thiekness of the muscular duct. The long gizzard is in the 6th segment, wjth the thin septum fiv e -s ix th s attached near its anterior margin. The oesophagus bears a single pair of glands in the 15th segment and is well marked and hemispherical, though a good deal compressed antero-posteriorly owing to the contractions of the body. The intestine commences in the 16th segment. P roc. Z ool . S oc.- 1 9 0 4 , V o l . II. N o . X V . 15 |
