1892.] SPECIES OF EARTHWORMS. 697 



integumental pigment and to the consequent visibility of the blood- 

 vessels through the skin. 



The setee are strictly paired. The clitellam is not developed 

 ventrally, it extends dorsally over four segments, viz. xiv.-xvii; the 

 male pore is single and median upon segment xvii, near to the poste- 

 rior end of that segment ; the spermatothecal orifice is also single 

 and upon the xiiith segment. 



There are a few papillae present; on the eleventh segaieiit are a 

 pair on each side of the median ventral line ; on the fifteenth seg- 

 ment are another pair occupying a corresponding position ; finally 

 there are two pairs on segment xiii., one pair in front of and one 

 behind the spermatothecal orifice ; in sections these papillae are seen 

 to be slight depressions of the integument, and the epithelium is 

 deeper than that which covers the body generally ; it is also composed 

 of large clear cells which have a glandular appearance. It is pos- 

 sible that the papillas are adhesive disks, and not, as they seem 

 frequently to be in some other Oligochaeta, sense-organs. 



A very marked peculiarity of the family Eudrilidae is the presence 

 in the skin of those peculiar sense-bodies which were first described 

 by myself in Eudrilus, and have since been found in a few other genera 

 of the family ; they are, however, by no means universal, but have 

 never been met with in any worm not belonging to the family Eudrilidae: 

 they occur in the species under consideration. I only observed them, 

 in the clitellar region ; this was perhaps due to the fact that else- 

 where they were not so readily visible owing to the thinness of the 

 epidermic layer ; they lie in the clitellura beneath the epidermis, 

 and are placed longitudinally vvith reference to the long axis of the 

 body. 



The muscular layers are not very thick ; but there are no note- 

 worthy points to comment upon. 



With regard to the internal anatomy, the alimentary tract shows 

 a peculiarity not hitherto described in any Eudrilid : in many 

 genera of this family there are calciferous glands of two kinds — 

 paired organs in segment xiii., and ventral unpaired pouches in seg- 

 ments ix., X., xi. The present species has neither of these two kinds 

 of appendages ; but it is not, as are many forms (e. g. Libyodrilus), 

 entirely without glands appended to the oesophagus. 



In segments vi.-x. there are pairs of whitish-coloured glands which 

 have a remarkable structure, quite unusual and unparalleled in the 

 group Oligochseta (see, however, the following description of Tricho- 

 chceta barbadensis). One of these glands is illustrated in fig. 11 of 

 Plate XLVl. ; the gland is of an oval or sometimes a more irregular 

 shape ; it is bounded externally by a thin layer which stains darkly 

 with borax carmine, and which is perhaps to be regarded as the 

 peritoneal layer investing the gland externally ; within this there 

 is a mass of tissue consisting of innumerable spherules like the yolk- 

 spherules of an ovum, and, like them, not stained by the reagent. 

 Here and there among the mass of spherules are scattered nuclei, 

 evident on account of their staining very deeply with the reagent 

 that produces no effect upon the surrounding granules ; there were 



