170 MARSHALL: ON A BRITISH SPECIES OF MYRINA. 



I have a valve of an undescribed Mi/rhm from Korea in which the 

 hinge-plate is strongly crenated on both sides of the ligament. When 

 Gwyn Jeffreys, however, put the matter right about the ligament, he 

 did not formally abandon Idas, although the only reason for keeping 

 it alive now is in the hope (a very remote one) of living specimens 

 being found of Idas dalli, E. A. Smith, ^ a "Challenger" and 

 " Porcupine " species, and in that shell being found to possess an 

 external ligament. Mr. Edgar A. Smith writes of /. dalli that he 

 could not discover "in any of the odd valves (no complete specimen 

 was obtained) any trace either of an internal or external ligament; it 

 is I expect of a very slight character." My valves are in poor con- 

 dition, and appear granulated on the surface, but that may be owing 

 to a micro-organism, as Mr. Smith describes the shell as "almost 

 destitute of sculpture." 



The foregoing three si)ecies of Mijrina have the contour of 

 Modiolaria, while /. dalli is mytiliform. Gwyn Jeffreys missed the 

 opportunity of describing the animal of M. anjenttus, and I have 

 failed to make anything that would be reliable out of my resuscitated 

 specimens. 



NOTES. 



On some largre specimens of Valvata piseinalis.— I have recently 



received from llie Concyijrc Kt-servdir, near Dudley, Slaffiirdshire, some specimens 

 of Valvata piseinalis, ^li.ill., which seem worthy of recording on account of their 

 large size. Three of the largest specimens measured in height 6'9, 68, and 6'5 

 mm., whilst the average of twenty was 6 mm. I at first thought that possil)ly this 

 large size was due to the great volume of water in which tliey had lived, but 

 curiously to say, examples of Limimca percgra and L. glabra, which were found in 

 company with F". piseinalis were a\\ very smaM. — Walter E. Collinge. 



Note on Helix rufeseens.— In 1894, Mr. Collinge recorded the occurrence 

 of //. rK/csccn.s from Selly Oak and near Olton, Warwickshire (Journ. B'gham. N. 

 H. & Phil. Soc, 1S94, vol. i, p. i8). Previous to this, local conchologists doubted 

 the presence of this widely distributed species, in the neighbourhood of Birmingham. 

 The late Mr. G. .Sherritf Tye, who had worked the district for very many years, 

 had never met with it. It may therefore be of interest to record that I have taken 

 upwards of a dozen specimens in the Solihull and Knowle district during the last 

 five years. I have also recently examined the late Mr. W. G. Blatch's collection, 

 which is now in my possession, and I find there thirteen specimens labelled 

 "Knowle," collected between 1872 and 1877. — H. Willoughby Ellis. 



3 "Challenger" Pelecypoda, p. 281, pi. xvi, figs. 10, 10b. 



