soi7ie neiv species of Drawida. 529 



examined, and only in a few appear as curved slits iu the 

 £arro\r 10/1 1 external to seta-line b. 



Nephridial pores on seta-line d. 



The colour of these forms at the time of capture was a 

 deep chocolate anteriorly and greenish brown over the 

 posterior half of the body. In the spirit-specimens the 

 chocolate is rendered into a pale violet or mauve, and the rest 

 of the body is pale brownish. 



Internal Anatomy. — The first recognisable septum is 2/3, 

 and is broken up laterally. Septa 3/4 and 4/5 have the 

 same ill-defiued lateral walls, their place being taken by 

 powerful muscles, which form part of the pliaryngeal mus- 

 cular system. Septa 5/6-8/9 are thick. The succeeding 

 ones are tender. 



The pharynx is muscular and occupies four somites (2-5). 

 The retractor muscles, which connect the pharynx to the 

 parietes, bear masses of glandular cells in somites 3-5 nearer 

 to their pharyngeal ends. In the species of Draivida de- 

 scribed and others to which reference is made in this paper as 

 liaving been subjected to investigation, I have noticed the 

 presence of white glandular masses of cells on the posterior 

 face of septa 2/3-4/5. Examined microscopically, the masses 

 are seen to be composed of spherical cells mainly aggregated 

 round the septal vessels, and may be therefore looked upon 

 in the nature of blood-glands, though in a very incipient 

 condition of development. 1 have not been able to detect 

 any ductule issuing from these septal blood-glands, nor from 

 the gland-masses aggregated ou the muscle-bands of this 

 species. In segment o, however, of D. paradoxa are found 

 masses of distinct glandular lobes, white, more or less 

 flattenid, and closely applied to the dorsal and lateral 

 pharyngeal wall, completely hidden by the forward deflection 

 of the septum 5/6. When an entire gland is removed with 

 its connections, cleared, and examined, a ramifying system 

 of canalicules, which obviously drain the cellular secretion, 

 may be detected. The cells themselves are large spherical 

 bodies full of granular cytoplasm, with a distinct, centrally 

 situated, large, rounded nucleus. A few muscle-fibres con- 

 stitute the matrix of these glands, which have no relation 

 with the septum. In the sectional preparations the discrete 

 openings of these glands into the pharynx and a glandular 

 pharyngeal epithelium, having essentially acytologicial struc- 

 ture similar to the glands, are detectable. There can be 

 little doubt as regards the glandular pharyngeal epithelium 

 discharging a digestive function, and in that case the glands 

 in somites 5 and those on the pharyngeal muscle-band may 

 Ann. & Mag. N. Hist. Ser. 9. Vol. viii. U. 



