220 JOURNAL OP CONCHOI.OGY, VOL. I4, NO. 7, JULY, I914. 



Conclusions. — The radula of Hyalinia helvetica is relatively larger 

 in young specimens. The increase in size which accompanies growth 

 of the snail is mostly due to an increase in size of the teeth. There 

 is also some increase in the number of rows, and in the number of 

 teeth in each row. The third lateral and first marginal teeth become 

 more differentiated. In describing any radula, therefore, the size of 

 the individual from which it has been derived should in all cases be 

 stated.-^ 



The colonisation of Helix cantiana in Herefordshire. — In 1891 seventy- 

 nine specimens of H. cantiana from near Oxford were turned out on a hedge Lank 

 near Hereford. They all disappeared in a few months, and though the place was 

 examined on many occasions nothing more was seen of them till April 1914, when 

 two half-grown specimens were found about 50 yards from the place where the 

 original snails were put. With the exception of a record (which I have n^ver been 

 able to confirm) for Dinmore (some seven miles distant) by H. T. Soppilt, I do not 

 know of the occurrence of this species in Herefordshire, and it appears probable 

 that the attempt at naturalisation was really successful after all. But it is curious 

 that the species managed to remain undetected for 23 years. — A. E. Boycott 

 {R tad before the Society, May 13th, 1914). 



Some New Records from South Wales. — In May last year I was in South 

 Carmarthenshire and Pembrokeshire, and although the time at my disposal was 

 very limited, I managed to add some records to the Census for those counties. 

 These records are marked with an asterisk. I first tried a very small stream close 

 to Kidwelly Castle, where I found '^Paludestrina jenkinsi abundant, I.immea 

 tnmcatida, Pisidium casertantini, P. nitidum, P. pusilhim, and P. milium. Next 

 day in a pool near Hoyle's Mouth, Tenby, I got Valvata cristata, * Planorbis 

 fontamis, P. crista, and * Pisiditcf?i personatitm . In a stream at Manorbier, close to 

 the sea, Litnncea truncatula, '^ Pisiditun sttbtruncatum, P. casertanum, P. nitidum, 

 and P. milium. In some moss from close to Hoyle's Mouth, besides some very 

 common kinds, I got Zua lubrica, Hyalinia cellaria var. albinos, H. alliaria, 

 H. nitidtila, H. crystallina, '' Punctum pygnicettm and Balea perversa. I have to 

 thank the Hon. Recorder for having the specimens duly authenticated and the 

 new records marked. He submitted the Pisidia to Mr. B. B. Woodward, to whom 

 also my thanks are due. — John Williams Vaughan ^Read before the Society, 

 March il, 1914). 



I I do not propose at present to deal with the literature of the subject, but it is proper to 

 mention that these conclusions are those arrived at by Sterl<i, whose paper in the Proceedings 

 of the Academy of Natural Sciences of Pliiladelfihia, 1S93, p. 388, is the locus classicus on 

 the matter. 



