172 Proceedings of Royal Society of Edinburgh, [april 4 , 
the median papillae of the two succeeding segments ; the 9th 
segment has a single papilla, corresponding in position to the outer- 
most right-hand one of the 10th segment, the others being indistinct ; 
the 7th and 8th segments have each a single median papilla. In 
another example the 12th and 13th segments have a single median 
papilla; the 10th and 11th segments have each three papillae; the 
7th, 8th, and 9th a single median papilla. 
Two other examples present an arrangement of the genital 
papillae nearly identical with that last described, the only difference 
being that the papillae on segments 7 and 8 are wanting. 
In every case the papillae present the appearance of a circular 
disc similar in colour to the clitellum, and surrounded by a whitish 
line ; the greater part of the disc is placed in front of the row of 
setae. 
The postclitellar papillae are not so distinct as the preclitellar. 
The whole of the ventral integument on the 17th, 18th, and 19th 
segments lying between the male aperture is whiter in colour than 
the rest, which renders it very difficult to map out the position of 
the papillae. The 17th segment appeared to have a row of these 
papillae; in the 18th and 19th segments I could only distinguish 
two pairs of papillae, one placed outside of the male pore on the 
18th, and in a corresponding position on the 19th segment, and the 
other placed below, and both inside of the male pore. The 20th 
segment has a median row of papillae (3 or 4), the 21st segment 
has three median papillae. The postclitellar papillae are considerably 
smaller than the preclitellar. I am inclined to think that the 
whitish appearance of the integument between the male generative 
pores is due to the crowding together of a row of papillae, which 
become distinct and separate on the 20tb, and especially on the 21st 
segment. 
The large pharynx extends back to about segment 3 ; the gizzard 
occupies segments 4, 5, and 6 ; it is important to notice that in every 
case the segments in which the gizzard lies are separated from each 
other by distinct, though rather delicate, mesenteries ; this fact is 
worth recording, because in many species of Perichceta (and other 
genera) the gizzard occupies two segments, and the median 
mesentery has disappeared ; there seems to be, however, some con- 
nection between this condition and the position of the gizzard. 
