BY JAS. P. HILL. 
35 
infolclings of the splanchnic epithelium, the .spaces between these 
infoldings being filled with blood and representing the glomerulus 
vessels. For this view speaks the arrangement of the nuclei 
which occur more or less regularly along the course of the vessels. 
Round the nuclei an oval non-staining cell body can frequently 
be recognised, and they can in some places, as Spengel has 
observed, pass directly over into the splanchnic epithelium. 
Efferent Proboscis Vessels : The efferent proboscis vessels after 
they leave the glomerulus are essentially similar in their course 
and disposition to those of Ft. minuta. However, as Koehler* has 
found in Ft. sarniensis, the two efferent proboscis vessels are 
connected with each other in the proboscis neck by a well-marked 
vessel (figs. 10, 14, cv.) which passes, in the "chondroid tissue" 
occupying the space between the anterior portion of the "keel" of 
the proboscis skeleton and the posterior portion of the "end plate." 
I have met this connecting vessel not only in transverse series, 
but also in both vertical and horizontal longitudinal series, and 
there can, in my opinion, be no doubt as to its existence in this 
species. Spengel, however, asserts that the efferent proboscis 
vessels "never stand in connection with each other," and believes 
"Koehler has been apparently deceived through the intense 
colouration with carmine of certain parts of the skeleton which 
thereby become very similar to the blood fluid, "f A series of 
transverse sections through an individual of the species under 
consideration, whose vessels were richly filled with coagulated 
blood, leaves me in no doubt on the matter, and the appearance 
presented by the vessel as seen in two adjacent sections is 
represented in fig. 10 (cv.). The specimen was stained with 
cochineal in 70 % alcohol with the result that the coagulated blood 
stained a much deeper tint than the proboscis skeleton, allowing 
the two to be very easily distinguished, and moreover the 
coagulated blood in the connecting vessel could be distinctly seen 
to pass over at both ends into that in the efferent proboscis 
* Contribution a 1' £tude des Enteropneustes Internat. Monatsschrift 
f. Anat. u. Histologie, Bd. iii. 1886, p. 174 
t Lop, cit., p. 633. 
