LINNEAN SPECIES OF BRITISH NON-MAR] NE MOLltJSCA. 205 



In the box with the contents of No. 27 was a label " Helix cellaria," and 

 in with No. 53 one " Patella lacustris." Both these labels are in an un- 

 recognized handwriting. 



There are likewise in the collection, but without any original information, 

 specimens of : — 2 P yramidula ruderata (Studer) ; 8 Helicella rirgata (DaC.); 

 20 Cochlicella acuta (Mull.) ; 1 Vallonia excentrica, Sterki (labelled by some 

 one "Helix pulchella") ; 2 Helicodouta obvoluta (Mull.) : 3 Helix aspersa, 

 Mull., ticketed in the unknown handwriting "Helix grisea," and 10 others 

 including one with the remains of a label in script apparently of the date of 

 the collection " Helix [* *] 2" in two lines ; 2 adult and 7 juvenile specimens 

 of Helix piscina, Mull.; 2 Clausilia, ticketed "lidentata" Strom's name 

 evidently being meant ; 4 Succinea pfeifferi, liossm. ; 1 Limnaa palustris 

 (Mull.) ; o Segmentina nitida (Mull.), which had been wrapped in a scrap of 

 paper bearing German print on both sides ; a packet, the paper of which 

 bore Swedish print on one side and Latin on the other, containing 3 Planorbis 

 umbilicatus, Mull. [ — PI. planorbis, Linn.], 1 PI. carinatus, Mull., 1 PL 

 alius, MUU., with a juvenile example of Helicigona lapicida (Linn.), these 

 several species have been distributed in different glass-topped boxes, but 

 careful record given of their former association ; 4 Valrata piscinalis (Mull.); 

 20 examples of Pomatias elegans (Mull.)"; and finally a specimen of Unio 

 tumidus, Betz., on a tablet with single valves of two other species, with the 

 sole comment in pencil "3 species." It will be observed that with the 

 exception of Pyramidula ruderata, Helicella rirgata, Clausilia lidentata, 

 Succinea pfeifferi, and Unio tumidus all are MUllerian species, for the Vallonia 

 was evident!}' sent as Helix pulchella, Mull. 



Putting the above facts together it seems clear that cotypes of some at 

 all events of Midler's species are included in the Linnean collection, and 

 that the recognition of their presence explains some of the doubtful points 

 that have attended the attempts to identify certain of Linne's species. 



A Botanist first and last, the great Naturalist does not appear to have 

 attached much importance to his collection of shells, nor to have preserved 

 those obtained for and described in the ' Fauna Svecica." Although these 

 last may perhaps have suffered in the tribulations the collections underwent 

 even in Linne's time, as recorded by Dr. B. D. Jackson (Proc. Linn. Soc, 

 Sess. 125, suppt., pp. 1 & 2). 



In passing under review the various species with which we are at present 

 concerned it will be convenient to take them in the order of classification 

 and under the nomenclature most generally accepted to-day, as follows, an * 

 being prefixed to those which were recorded by Linne as present in his 

 collection (cf. list by Dr. B. D. Jackson, Proc. Linn. Soc, Sess, 125, 



LINN. JOURN. — ZOOLOGY, VOL. XXXIV. 16 



