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Show 206 MR. F. E. BEDDARD ON EARTHWORMS [Jan. 14, I give segment vi. instead of v. since I did not count the setae with accuracy upon the latter. The setae towards the ventral side are slightly 'more crowded than laterally, but there is no very marked difference in size ; neither is there any very great variation in size from segment to segment. # The clitellum occupies the whole of segments xiv.-xvi.; it lias no setae. The male pores are separated by 12 setae. There are no genital papillae. Between the spermathecal orifices are 30 setae. There are no septa that can be spoken of as specially thickened. The gizzard seemed to me-contrary to what is the rule with the genus-to only occupy a single segment, At any rate, on the right-hand side of the body a septum passes forwards from the hinder margin of the gizzard, to be attached close to the orifice of the second spermatheca of that side of the body. The intestine, commencing in the fifteenth segment, is very sharply marked off from the preceding oesophagus by its black colour (due of course to contained earth), the oesophagus being yellowish white. The intestinal caeca are peculiar and serve to differentiate the species. It is well known that Perichceta hilgendorfi, P. sieboldi, P. musica possess as a rule, or occasionally, 6 of these caeca on each side of the body, arising, however, one above the other in the same segment. The present species is not so amply provided as are those to which I have just referred ; but it has three caeca on each side, of which the upper is the larger. The last heart is in segment xiii. The sperm-sacs are large and occupy the available space of segments xi., xii.; they also extend into x. The sperm-reservoirs (in x., xi.) are small. The spermiducal glands extend through segments xvii.-xxi. They are much incised and quadrangular in form. The duct communicates with the exterior through a large bursa copulatrix. The globular spermathecae are in vii. and viii.; they open, however, between vii./vih. and viii./ix.; their duct is short; there is a long coiled diverticulum rather longer than the pouch, ending in a dilated extremity. Hab. Barbados. PERICHAETA TRINITATIS, n. sp. This is a stout Perichaeta measuring 150 m m . in length and consisting of 100 segments. The setae upon segments vi.-ix. appeared to be larger than those on the segments following. On the seventeenth segment (from the stripped-off cuticle) I counted 45 setae. There are 20 between the male pores. The dorscd pores appeared to commence on xi./xii. The clitellum occupies segments xiv.-xvi. The male pores are very conspicuous and surrounded by circular wrinkles of the integument. |
