232 



SCIENCE-GOSSIP. 



obligingly placed in my hands by Miss Linter, at 

 whose request I name it after her friend, Mrs. 



Fig. 67—Plectopylis pcrrierac. 



Lumley Perrier. In contour this new species 

 lesembles Pkciofylis fcvavcia [ante vol. ivi. page 155, 

 fig. 19), but the shell is much larger. The 

 parietal armature further connects it with the 

 species just named, but the palatal armature is 

 more like that of P. leiopliis. The two specimens 

 of the new species are stated by Miss Linter to be 

 from Thayet-Mayo, Pegu, Burma ; a third specimen, 

 which is in Miss Linter's collection, is accom- 

 panied by a label bearing the localily, Niningo 

 (Burma ?), but I have failed to trace this name in any 

 of the maps and gazetteers to which I have access. 

 The specimen figured, and the cne in Miss 

 Linter's collection, have the measurements given 

 in the diagnosis, but my second specimen measures 

 only i2'5 millimetres in diameter. Figs. 6ya-c 

 show the shell in three different aspects, natural 

 size; figs. 6yd-f, are enlarged ; d, shows the 



and round the umbilicus, and descending shortly and 

 abruptly in front. Aperture heart-shaped ; peristome white, 

 scarcely thickened, a little reflected; the margins united by 

 an elevated sinuous ridge on the parietal callus, notched at 

 the lower junction. Umbilicus wide and deep. Parietal 

 wall with a thin vertical plate, strongly deflected posteriorly 

 below, and giving off a short horizontal ridge at the upper 

 extremity on each side ; a long horizontal flexuous fold 

 rises close to the upper extremityof this plate on the anterior 

 side, descending suddenly at first, then ascending gradually, 

 and afterwards gradually descending, following the deflection 

 of the last whorl, becoming united to the ridge at the 

 aperture; a second, shorter, horizontal fold occurs below 

 this one, rising close to the lower extremity of the vertical 



filate, proceeding horizontally at first, and then ascending a 

 ittle; another very thin fold rises below the vertical plate, 

 running parallel to the lower suture as far as the aperture, 

 where it unites with the ridge. Palatal folds, five: the first, 

 lather long and thin, near to and parallel with the suture, 

 with a deep indentation near the posterior extremity, divid- 

 ing it into two unequal parts; the second, horizontal, a 

 little deflected posteriorly, with an elongated denticle 

 posteriorly, anJ a second, smaller, one above the first ; the 

 third fold much shorter, strongly curved downwards 

 posteriorly, with a minute denticle posteriorly; the fourth 

 fold vertical with an obliquely descending ridge posteriorly 

 at the upper extremity, and bifurcated at the lower extremity, 

 the anterior arm of the bifurcation the shorter; a minute 

 denticle occurs near the ridge at the upper extremity and a 

 second one near the middle, both on the posterior side ; the 

 fifth fold is thin, horizontal, and strongly deflected on both 

 sides. — Major diameter, 15 millimetres; minor diameter, 

 12 millimetres; altitude, 5 millimetres. — Habitat, Thayet- 

 Mayo, Pegu, Burma. — Type in my collection. 



parietal and palatal armatures from the posterior 

 side ; e, the inside of the outer wall with the 

 palatal folds and denticles ; and /, the parietal 

 wall with its plate and folds. 



(To be continued.) 



ROYAL INSTITUTION. 



"THE following Lecture arrangements before 

 Easter are : — Professor Oliver Lodge, six 

 Christmas lectures (specially adapted for young 

 people) on " The Principles of the Electric 

 Telegraph"; Professor E. Ray Lankester, eleven 

 lectures on "The Simplest Living Things"; 

 Professor Dewar, three lectures on " The Halogen 

 Group of Elements"; Dr. J. Paul Richter, 

 three lectures on " Some Italian Pictures at 

 the National Gallery " ; Professor J. A. Fleming, 

 five lectures on "Recent Researches in Magne- 

 tism and Diamagnetism " ; Professor Patrick 

 Geddes, three lectures on " Cyprus " ; Mr. Wm. H. 

 Hadow, three lectures on " The Structure of 

 Instrumental Music " ; Mr. Lionel Cust, two 

 lectures on " Portraits as Historical Documents, 

 Portraits as Monuments." The Friday evening 

 meetings will begin on January 21st, when a 

 discourse will be given by the Right Hon. Sir John 

 Lubbock, Bart., MP, on "Buds and Stipules"; 

 succeeding discourses will probably be given by 

 Professor C. Lloyd Morgan, Mr. A. A. Campbell 

 Swinton, Dr. J. Hall Gladstone, Professor L. C. 

 Miall, Captain Abney, Professor J. E. Thorpe, 

 Mr. James Mansergh, the Dean of Canterbury, 

 Professor Dewar, and other gentlemen. 



THE DENTON COLLECTION. 



SPHERE is at present on view in Mr. Robert 

 -*■ Dunthorne's " Rembrandt Gallery," 5, Vigo 

 Street, London, a very beautiful collection of most 

 perfect specimens of butterflies and moths, chiefly 

 of extra-British origin. It is not claimed by 

 Mr. Shelley W. Denton, the originator of this 

 exhibition, that it has any scientific pretensions. 

 The novelty is in the manner of mounting the 

 specimens, which, though unpinned, are set out 

 somewhat like the ordinary spreading adopted by 

 collectors of lepidoptera. Each specimen is put 

 in a separate little glass-covered case, backed by a 

 Denton patent tablet, which has a surface hollowed 

 out in the middle, made of very fine plaster of 

 Paris. This system is not one which will appeal 

 to students who desire to handle their specimens in 

 examination, as it only permits of one side of the 

 insect being seen. As a thing of beauty such a 

 collection as Mr. Denton's would be hard to match, 

 and we can strongly recommend our readers who 

 have not seen this system to take this opportunity. 

 There are about 1,500 cases on view. 



