| OCR Text |
Show 1896.] FROM THE SANDWICH ISLANDS. 205 other and to the parietes by a considerable number of ligamentous threads. The three septa which come immediately after the gizzard are stouter than those which follow; but here, again, the increase in thickness is not very marked. Fig. 2. Perichceta insula. $, oviducal pore. ^, male pore. p, papillae. The pharynx, as is so usual in Perichceta, is beset with numerous racemose glands; these extend back as far as the sixth segment. The gizzard is rather bell-shaped, diminishing in transverse diameter anteriorly, but truncated posteriorly, where it has a thickened rim. The intestine begins abruptly in the xvth segment at about the middle of that segment. The caeca extend through two segments. The last heart is in segment xiii. The sperm-sacs, compact in form, are in segments xi., xii. as usual. The spermiducal glands, also rather compact, commence in xvii. and extend as far back as xx. The duct is stout and S-shaped. The spermathecce are in vi., vii. Each has a diverticulum about half its own length, of an elongated oval form. Hab. Hong Kong. PERICHAETA TRITYPHLA, n. sp. The length of this species (after preservation in Perenyi's fluid) is 63 mm.; that individual consisted of about 75 segments. The seta-formula is as follows :- I. VI. XII. XVII. 25 38 49 49 |
