Tico Xeiv Species of Ptyckodera. 211 



On the inner sides of the genital pleurae, the genital groove could 

 be traced throughout their whole length. 



The gills region in the preserved condition is 45 mm. in length, of 

 an almost uniform breadth of 4 mm. measured between the points 

 where it joins the genital pleurae ; it contracts abruptly at its posterior 

 end. The gill openings lie at the base of the genital pleurae, and 

 are dorso-lateral in relation to the alimentary tract. 



The glands were of a bright orange-yellow on the inside of the 

 pleurae, the outside of which was darker, while the ventral side of 

 the body in this region was characterised by a decided dark-brown 

 colour. 



Hepatic region. A few hepatic coeca occur in a small part of the 

 pleural region about half a dozen on each side of the middle line, 

 and arranged in single rows about 6 mm. in length. The anterior of 

 these were small and not very distinct ; the posterior were well 

 developed. 



The fourth fragment was 42 mm. in length, and was covered with 

 the hepatic coeca, at first in a single row on each side and hardly 

 compressed, becoming towards the centre larger, crowded together, 

 and arranged in an irregular mass. The glandular corrugations of 

 the skin of the ventral side of the body in this region were regular, 

 and where the cceca were most developed had small swollen endings 

 usually connected to them by a thin strand of epithelium, but some- 

 times quite separated from them, so that there appeared to be a 

 groove along this part of the body. This groove did not appear to 

 be continuous with the longitudinal grooves on the ventral surface 

 of the genital region. The line of small swollen patches may be 

 regarded as the representatives of the genital pleurae in this region. 

 The greatest vertical diameter of this region in the preserved speci- 

 men was a little over 4 mm. and slightly greater than the horizontal 

 diameter. 



A fifth fragment, about 12 mm. in length, also belonged to the 

 hepatic region. 



The hepatic cceca were of a dark brown or reddish colour, and 

 the ventral side of the body in this region was of a dark colour. 



Caudal region. This is represented by two pieces 25 and 

 34 mm. in length respectively. When procured they were filled 

 with mud, in which no sand-grains were perceived, and they measured 

 in this condition about 4 mm. in diameter. As in many other species, 

 this region is characteristic. The glandular patches of the epithelium 

 occur here in comparatively broad rings of a dark brown colour, so 

 as to give the tail region a marked annulated appearance. These end 



