24 DR J. STEPHENSON ON 
what towards the front. The proboscis, when extruded, was bulky and long. A pair of 
transverse grooves, which indented the lateral margins, were visible one on each side 
dorsally behind the posterior eyes. 
The eyes were four in number, large, reddish brown, apparently situated some distance 
beneath the surface. The distance between anterior and posterior eyes of the same side 
was considerably greater than that between the two anterior or the two posterior eyes. 
The stylet was of the same length as its basis; the latter was somewhat conical in 
form, with rounded end (v. fig. 16). Here, again, I find a considerable difference from 
BurRGER's figure (3), which shows a somewhat dumbbell-shaped basis, markedly con- 
stricted, with rounded ends of about the same size. 
There were two reserve sacs, each with four stylets. 
Inneus longissimus (Gunn.). 
Not uncommon ; under stones near low-water mark, Balloch. 
No great lengths were met with; 10 feet is not uncommon ; breadth } to 4 inch, large 
specimens 4 inch. 
The animals are sluggish in habit. The general colour is from a dark brown to a 
dark velvety black, with a slight purple iridescence ; the ventral surface is a little paler 
than the dorsal. This general ground colour is varied by a longitudinal striping of a 
lighter tint; distinct lateral and mid-ventral lighter stripes are always present, but the 
dorsal stripes are variable—of these latter there may be several, running parallel. All 
the stripes are most marked in the anterior part of the body ; some of the larger speci- 
mens had none on the dorsal surface except a mid-dorsal stripe, and that only on the 
head. 
The shape of the head would seem to merit a short consideration. MacInrosu 
describes the head simply as being wider than the succeeding portion of the body. 
Bircer, however, lays more stress on this character, and writes, in the diagnosis of this 
form in the Tverreich : “ Kopf verbreitert, spatelformig, nicht vom Rumpf abgesetzt ; ” 
while in his key to the various species of the genus the distinguishing character is “‘ Kopf 
auffallend stark verbreitert.” Jouprn (8) does not mention a broadening of the head, 
ancl his figures show it as slight or absent. 
In the Millport specimens the head has whitish margins and is somewhat flattened. 
When the animals are contracted, it is narrower than the succeeding part of the body ; 
but, when well extended, it is of equal breadth or very slightly broader. It is marked off 
by distinct though slight notches, and is indented in the middle line anteriorly ; I could 
not distinguish median and lateral papille. The situation of the ganglia is marked by 
a reddish patch about one-sixth of an inch behind the anterior end. 
The broadening of the head would seem, therefore, taking all the descriptions 
into consideration, to be a variable characteristic, and hardly suitable for employment 
as a specific character, or for use as the diagnostic mark in a key. It will also be 
