128 
SIDNEY E. HA EM EE. 
is not more than a quarter of the entire length, although 
absolutely of about the same length as in PI. 7, fig. 3. In 
many of the specimens the proximal region of the muscular 
part of the body is slightly invaginated (PI. 7, figs. 4, 8), 
thus forming a sort of shallow cup surrounding the base of 
the remainder of the muscular portion. The cavity of the 
cup faces distally, towards the lophophore. 
The remainder of the body-wall is extremely thin and 
transparent. In some individuals (PI. 7, fig. 8) the extreme 
proximal end has the ampulla-like form usually found in 
Phoronis. The absence of a typical ampulla in other 
specimens is doubtless due to the loss of this region when 
transverse fission takes place ; but the ampulla is probably 
regenerated in due course by the distal individual formed by 
fission. Muscles have not been detected in the “non- 
muscular part ” ; and if they occur they must be excessively 
thin. 
The alimentary canal has the form usual in the genus. 
The first part of the descending limb is formed by an 
oesophagus, sharply marked oft from the succeeding part, 
and occupying from half to a quarter of the length of the 
muscular part of the body (PL 7, figs. 3, 8). The remainder 
of the descending limb, constituting the proventriculus ( pr .), 
is relatively narrow throughout the muscular region, but it 
gradually ddates in the non-muscular part, reaching its 
maximum size in the ampullar region, but before the extreme 
proximal end is reached. From the dilated stomach ( st .) 
thus formed (PL 7, fig. 8) a short section of the descending 
limb, of distinctly smaller size than the stomach, continues 
to the proximal end of the body, where it curves round into 
the ascending limb ( int This portion is for the most part 
of small diameter, though its size depends partly on the 
amount of the remains of food (commonly Diatoms) or the 
faeces which it contains. The last part of the intestine 
is of small size, and opens by the anus (Pl. 9, fig. 40, an.) 
close to the lophophore, and on the side corresponding with 
the base of the epistome. 
