2io 
The Irish Naturalist. 
October, 
VITRINA PYRENAICA. 
A SUPPLEMENTARY NOTE. 
BY E. W. BOWELL, 
In May, 1908, my account of the anatomy of Vitrina 
pyrenaica was published in the Irish Naturalist. Recently 
I have been enabled to review the subject, with the kind 
assistance of Dr. A. E. Boycott. Briefly, I find that I 
was in error with regard to the two organs opening upon 
the atrium : the large object which I described as penis 
and flagellum is undoubtedly the homologue of the dart 
sac found in Helicids, and the object I have marked d.v.d.^ 
(i.e., diverticulum vasis deferentis) is undoubtedly the 
penis, as other authors have described it.^ The coiled 
object joining the bases of these two organs, which I beheved 
I had proved to be tubular and lined with epithelium, is 
in reality a portion of the fascia lining the cavity. I 
greatly regret that these errors of interpretation have been 
perpetuated. The plate (Plate 4, vol. xvii.) represents 
the actual appearance of the organs in question, each item 
having been drawn by means of the Abbe camera. Figure 
H represents the dart sac and penis, both separated from the 
atrium, and the coil joining them is merely fascia. The 
other figures may be taken as they stand, changing the 
names of the two organs which I erroneously identified. 
(I may add that in the first place I drew and described them 
under the usual names). 
The following may serve to elucidate the lettering, 
which I am told has caused some trouble to readers : — 
Fig. B. y.p. means reflected peristome. 
Fig. D, b. means balancier ; g.o. genital orifice. 
Fig. E, r. radula. 
r.s. radular sac. 
r.i. reflected integument (twice). 
g.o. genital orifice. 
1 In Irish Nat., vol. xvii., pi. 4, fig. H. 
2 See the paper by Dr. Boycott, supra, pp. 205-9, 
