42 DR J. STEPHENSON ON 
glandular cells surrounds the aperture. On examining a series of sections, the ampulla 
is found to comprise the internal half of the mass; it is ovoid or somewhat pear-shaped, 
communicating with the cesophagus by its narrow end; its walls are lined by a low 
eubical epithelium, and in the lumen, arranged as a layer all round, are usually numerous 
deeply staining heads of spermatozoa. The duct, or outer half of the mass, is not 
sharply delimited from the ampulla, though often, in sections, appearing to be separated 
from it by a kink in one or other wail; its lumen is narrow, and it is lined by high 
columnar cells; it has a well-marked muscular investment. The gland-cells near 
the external aperture are really the lining cells of the duct, which here extend outwards, 
breaking through the muscular investment of the duct, which can still be seen in 
places between the cells; their nuclei are peripherally situated, outside the muscular 
layer, and the cells are continuous at the orifice with the surface epithelium. The 
above details are shown in Pl. I. fig. 5. 
Certain parasites (Gregarines) are seen in the body-cavity in several specimens. The 
body of these sporozoa is dark and opaque, their nucleus clear; the length of the 
double animal is about °5 mm. 
The alimentary canal also usually contains numerous sporozoa, with a much- 
elongated, deeply staining nucleus; the whole width of the lumen of the alimentary 
tube may be packed with them. In one series of sections one of these forms is present 
in the spermatheca, into which it had probably wandered from the cesophagus. 
The specimens of this species sent to VEspovsky from Lille differed from those 
previously obtained in Prague in having gland-cells round the apertures of the 
spermathecee. It will be seen that im this respect the Millport specimens agree with 
those from Lille ; Sournern’s specimens also possessed these glands. It is noteworthy 
that the same or a similar parasite should occur both in Vespovsky’s specimens 
and mine; in mine, however, two individuals were commonly found joined together, 
which appears not to have been the case in the previous specimens. 
Lumbricillus tuba, n. sp. 
Common ; found about high-water mark, Millport. 
In length this species is from $" to 14” ; it is tapering at both ends, more so anteriorly. 
Its colour is pale pink, the anterior half lighter than the posterior; ova may be seen 
as brilliant white spots; the whole animal is fairly transparent. The worms move 
when disturbed in an active, wriggling, nematoid manner. 
The number of segments varies within only narrow limits—thirty-five to thirty-nine. 
Prostomium blunt; head-pore present, but no dorsal pores. 
The seta are of the same type in both ventral and lateral series ; they are somewhat 
j-shaped, but the distal curve is very slight; they are comparatively slender ; there is 
no definite nodulus, but the shaft is slightly thicker a little distal to its middle. They 
are arranged in a fan-like manner in each bundle; the outer sete of a bundle are not, 
as in L. subterraneus, longer than the inner. 
