| OCR Text |
Show 236 ME. F. E. BEDDAED ON N E W EAETHWOBMS. [Mar. 19, and of the male pores bear genital papillae. There are a pair on each of segments x., xv., xviii., xix. behind the ventral pairs of setae, a single median papilla on x., and one transversely elongate papilla on xx., xxi. The male pores are very protuberant, and, as already mentioned, are rather lateral in position. They are of course upon xvii. With regard to internal structures, I have had to be careful so as not to unduly injure the single specimen at m y disposal. The gizzard is large and conspicuous, and appears to lie in segments vi. and vii. Behind this are seven septa, which are strengthened and lie within each other like a series of cups. The last heart is in segment xii. The racemose sperm-sacs are in segment xi. I believe that there are only a single pair of testes and sperm-duct funnels in segment x., but a m not quite sure. The ovary (in xiii.) is remarkable for being a very perfectly flat plate ending in a free tip as in Lumbricus, which projects beyond any of the ripe ova. The spermiducal glands are massive and somewhat coiled; they end in a very short and narrow duct. There are penial setae of considerable length (2*5 m m . ) , two in number in each bundle. These end in a flattened expansion which has a membranous appearance; for some distance in front of this the seta is so regularly marked and with such deep transverse striae, that it presents quite the appearance of the flagellum of the antenna of a lobster. It is simply an exaggeration of the striae generally to be found upon the extremity of penial setae. The spermathecae are in ix. Each is a good-sized pouch terminating in a duct, from which arises a single diverticulum of much the same form as the pouch but smaller. Hab. St. 47, Corral. (7) Microscolex robustus, n. sp. This new species of Microscolex is represented by a single specimen from Teja Is!., and three from Valdivia, Putabla. This specimen was unfortunately not fully mature, though the immaturity seemed to concern the clitellum only. It is a moderately large species, less than M. griseus or M. spatulifer and about the size of M. dubius. The coloration is on the same plan as that of M. diversicolor; it is not, however, so brilliant as in that species. The area upon which the lateral setae are implanted is, as in the last-mentioned species, white, while the dorsal surface of the worm is purplish. The length of this individual is 57 mm., the diameter 6 m m . ; number of segments 95. The prostomium is continued over the buccal segment by grooves. The setae are paired anteriorly but not strictly ; the ventral setae on segment xiii. are a little closer together lhan on the preceding segments, this convergence continues until the xvith segment; they begin to diverge on the xviith segment, and by the |
