| OCR Text |
Show 1896.] FROM THE SANDWICH ISLANDS. 203 But I possess specimens from Hong Kong which cannot be distinguished. One of these has four papillae near the male pore of one side of the body. It therefore approaches Perichceta bermudensis, which has a considerable number of such papillae. These two species are now hardly to be separated. Perichaeta sandvicensis, n. sp. The largest example of this species measures 100 m m . in length, and has 105 segments. The dorsal pores commence xi./xii., and are visible on the clitellum. The seta-formula is the following :- I. V. XII. XYI. 21 33 52 53 The setae of the first two segments are small; those of the next four are stronger, after which they again diminish. The setae on either side of the median ventral line are not longer than those elsewhere. The clitellum occupies segments xiv.-xvi., and has no seta?. The male pores are separated by 18 setae. They were in most of the specimens very prominent. There are no genital papillae. The first septum divides segments v./vi.; this and the one which follows are very stout, and bound to each other by numerous muscular threads. The septum vii./viii. is not so thick. The next two, as in other Perichcetce, are absent. After the gizzard are two strongest septae ; to the first of these the hinder part of the gizzard is attached by at least five muscular straps. The alimentarg canal presents no character of any particular interest. The last heart is in segment xiii. The sperm-sacs are in segments xi. and xii. The sperm-reservoirs of segment xi. are much larger than those of segment x. The spermiducal glands are much incised, and occupy about three segments. The duct is long and curved, and is without a terminal sac. The spermathecae are two pairs in vii. and viii. The pouch has not a very long duct. The diverticulum is not very long ; it is bent often in a zigzag fashion, and does not terminate in a suddenly dilated extremity. Hab. Lanai, 2000 ft.; Mauna Loa, Hawai, Molokai. Remarks.-The only species with which it would be possible to confuse the present are Perichceta annulata and Perichceta japonica. In the latter, however, the male pores are described by HorstL as lying upon a J-shaped groove, which extends on to segment xvii. In the former, according to the same author, the 1 " New Species of the Genus Megascolex, &c," Notes Leyd. Mus vol. p. 182. |
