SOME LITTORAL OLIGOCH ATA OF THE CLYDE. 39 
The length is perhaps not very important, but the direction of the duct of the nephridia, 
and the shape and size of the penial glands may also be mentioned. It is principally the 
characters of the spermathecal apparatus which have determined me to identify my 
specimens with his description. 
LIumbricillus subterraneus (Vejd.). 
Under the name Pachydrilus subterraneus, Vuspovsky (15), in 1889, described an 
Enchytreid which he had first found in a well at Prague; some worms sent to him 
subsequently from Lille, where they had been discovered in the water-pipes of the town, 
were found to belong to the same species. The next record of the occurrence of this form 
is by SournurNn (14); a large number were sent to him from the sewage works at 
Belfast, and the same species was also found by him in a stream in Lancashire which 
was excessively contaminated with trade effluents. In the present case, the third record, 
the worms occurred on the seashore, about high-water mark, where they must at times 
be exposed to the influence of salt water. 
Though there can be no doubt about the identity of the present form with that 
described by Vespovsxy, I add here a number of anatomical particulars, since in certain 
points the original description is somewhat brief. This is the case, for example, with 
regard to the setee ; the structures known as “‘ copulatory elands,” or “‘ Bauchmarkdriisen,” 
were also not described by Vespovsky (and may therefore have been absent); in con- 
sequence, this species is represented by Bepparp (1) (p. 325, in the key to the various 
species of the genus) as not possessing them, which might possibly lead to some confusion ; 
they were present in SOUTHERN’S specimens. 
Found about high-water mark, Fintry Bay, under moist stones, at a part where fresh 
water was running to the shore; and again at Balloch. The animals live well for 
several days in a mixture of equal parts of salt and fresh water, and equally well in 
altogether fresh water. 
Length up tol inch (25 mm.); fairly stout, tapering towards both ends, most 
gradually towards the anterior end. Colowr, various shades of red, whiter about the 
genital region ; ova visible as distinct pinkish-white masses. Locomotion by wriggling. 
Segments forty-nine to fifty-seven. Prostomiwm blunt, with a number of small 
papilliform projections. Clitellwm includes segments xii.—xiil., and may encroach on xi. 
Setx.—The dorsal series are dorsal, not lateral, in position; in the ante-clitellial 
seoments they number four to eight per bundle; in segment xii. fewer, two or three ; 
in the post-clitellial segments three to seven. The ventral series number five to eleven 
in the ante-clitelhal, three to eiglt in the post-clitellial segments; there are no ventral 
setee in segment xii. The setze are of the same type in the two series of bundles; each 
seta (fig. 4.) is [-shaped, the proximal of the two curves being the more gradual; each 
is moderately stout, and is thickest about the middle of its length, but there is no © 
distinct nodulus; the point is single. The setz of a bundle are arranged fan-wise, and 
TRANS. ROY, SOC, EDIN., VOL, XLVIII. PART I. (NO. 2). 7 
