MisceUuneous. 261 



their imblicationa aro invariablj' assisted in their deception. Fortu- 

 nately in the Natural-History Museum a pharp look-out is kept for 

 c.'ises of this kind, and covers arc always considered when a book is 

 sent to the binders. 



The book that I wish to call attention to is F. Moouk's ' Lepi- 

 doj)t('ra Tndica,' of ■\vliich tliirtcen parts have already appeared, and 

 of which the proper dates arc the following ; — 



Pt. 1. pp. i-viii, 1-2 +, April 1S90. 



Sot Auf/. Ib90, as stated in the 

 sif/natuns • 

 12!t-152, Aug. 1891. Sot Auf/. aiul Nov. 1800 and 



Juli/ 1891, as stated in the 

 sii/natni'es ! 



Sot Juhj 1801, as stattd in the 

 si(j natures ! 



Sot Ai(r/. and Sept. 1891, as 

 stated in the signatures ! 

 10. „ 209-240, April 1892. Sot Oct. 1891 and Jan. 1892, 



as stated in the sir/natures ! 



11. „ 241-272, Sept. 1892. Sot Jan., Mar., and Apr. IS92, 



as stated in the signatures ! 



12. „ 273-310, Dec. 1892. Sot Mag and June 1892, as 



stated in the sigiuitures ! 



13. „ 1-32, Jan. 1893. Sot Aug. 1892, as stated in the 



signatures ! 



1 do not know whether the author or the publisher is responsible 

 for this deceptive dating ; but it is to bo hoped that neither Mr, Lovell 

 Keeve nor Mr, Moore will any further indulge in such objectionable 

 vagaries, 



C, Davies Sheeborn 

 Natural-History Museum, (Index gen, ct spec, anim.). 



Croni-\vell Road, S.W, 

 Feb. 18, 1893. 



Diffuse Pigmentation of the Ei>idermis of the Ogster due to prolonged 

 t.viiosure to the light: Regeneration of Shell and Loss of Adductor 

 Muscle. 



Prof. Ryder reported on behalf of Prof, K. C. Schiedt that oysters 

 which had the right valve removed and exposed to the light in this 

 condition, in a living state, for a fortnight or so, developed pigment 

 over the whole of the epidermis of the exposed right mantle and on 

 the upper exposed sides of the gills, so that the whole animal from 

 this cause assumed a dark-brown colour. Animals so exposed not 

 only attempted to reproduce the lost valve and hinge, but also partly 

 succeeded in so doing, even re-eetablishing the insertion of the 



Ann. & Mag. N, Hist. Ser, 6, Vol. xi, 19 



