MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 449 
APPEND Ix, 
The additional information in reference to the Zonitidw and the various 
Helicide: treated of in the foregoing pages, acquired since the publication 
of the various parts composing the present volume, and the necessity of 
giving a complete description of Vitrinw hibernica—an addition to the 
British fauna and to science—a species only detected subsequently to the 
issue of the part dealing with the Vitrinw, renders it desirable to prepare 
this Appendix. 
FAMILY ZONITID IE Morch. 
Genus VITRINA Draparnaud. 
Vitrina hibernica Taylor. 
1907 Vitrina e/ongata Taylor, Trish Nat., Aug., pp. 225-231 and pl. 26 (net Drap.). 
1908)  —) pyrenaica Bowell, Ivish Nat., May, pp. 94-98 and pl. 4 (not Fer.). 
1908 — _ hibernica ‘Taylor, Monog. Moll., Oct., pt. xv. (cover). 
ISTORY.— Vitrina hibernica Aubernia, 
Ireland), a species belonging to the group 
Semilimax and also new to science and to 
our fauna, was detected while examining the 
collections of Mr. P. H. Grierson, of Diablo: 
whom I have pleasure in associating with the 
species, which we owe entirely to his energy 
and his devotion to scientific pursuits. 
Fortunately Mr. Grierson’s systematic aud 
precise method of collecting and registering his 
specimens enabled me to ascertain that this 
new species was found plentifully in Sept. 1904, 
also in Jfine 1905, and on other occasions, In a 
locality near Collon, Co. Louth. 
These specimens were first recorded by My. 
Grierson in Oct. 1904 (as Vitevna pellucida var. 
. depressiusculic) in the Journal of Conchology, 
0) ie Pago i 
1 On attention being drawn to the importance 
of this discovery, search was made for living 
——<——— specimens, these being found without difficulty. 
[ brought forward this addition to our fata at the Trish Field Club 
Conference, held at Cork, on July 11th, 1907, and the decease with 
full details of the occurrence was published in the Irish Naturalist for 
August of that year, naming the specimens Vitrina elongata Drap. from 
a study of the shell only, under the idea that they were a form of that 
species, to which they bear a close resemblance. 
In the following year the tev. Kk. W. W. Bowell forwarded a communi- 
cation to the Irish Naturalist, in which he expressed the opinion that the 
species was really the Vitrina pyrenaica of érussae. 
By the co-operation and help of the discoverer and other ardent col- 
lectors, a supply of living specimens was obtained, and these have been 
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