II. 
THE RECORDED OCCURRENCES OF LAND AND FRESH-WATER 
MOLLUSCA IN HERTFORDSHIRE. 
By W. Denison - Boebuck, F.L.S., and John W. Tayloe. 
Communicated by J. Hopkinson, F.L.S. 
Read at St. Albans , 10 th January, 1884. 
An accurate knowledge of previous writings on the subject, 
a comprehensive summary of the existing state of its literature, 
is at any time a desirable preliminary to the commencement of 
active research in any department of scientific investigation. It 
will therefore, we trust, be of some service to Hertfordshire 
conchologists to he possessed of such a sketch relating to the 
Land and Fresh-water Mollusca of the area of their investigations. 
More especially is this desirable at the present time, in view of 
the efforts which our friend Mr. Hopkinson is making towards 
the working out of the molluscan fauna of the county. 
Towards this work, however, the published records yield but 
a slender contribution, and it is to be confessed that, so far as 
this department of natural science is concerned, Hertfordshire 
must be considered as having been, down to the present time, 
an unworked and much neglected county, notwithstanding the 
number of able and distinguished conchologists who have at times 
resided or collected within its limits. No records of their labours 
exist, so far as we are aware, save the few which we now proceed 
to recapitulate. 
'"We judge it advisable to give, in the first instance, a list of 
books and papers in which reference is made to Hertfordshire 
Mollusca; and secondly, a systematic list of the species and 
varieties treated of, with an abstract or indication of the nature 
of the information given. The present paper, it may be hardly 
necessary to add, is confined in its scope entirely to printed and 
published records. 
I.-—List op Woeks containing Eepeeences to Heetpoedshiee 
Mollusca. 
1678. 
Maetini Listee, Historic Animalium An glim, tres tractatus. . . . 
alterdeCochleisturnTerrestribus turnFluviatilibus. pp. Ill, 112.— 
Cochlea cinerea, maxima, edulis, cujus os operculo crasso velut 
gypseo per hyemem clauditur=iZ<?fe pomatia. 
1803. 
Montagu (Gr.). Testacea Britannica, or British Shells, p. 407. 
—Helix pomatia. 
1808. 
Montagu (G.). Supplement to Testacea Britannica. p. 145. — Helix 
Cantiana. 
