DUBLIN NATUKAL UI8T0BT SOCIFTT. 121 



''In the higher forms of Crustacea the pleopoda in the male are often 

 altered in form, and sometimes even wanting, except when they are 

 subservient to the sexual character. It may be, therefore, that the dif- 

 ference between the present species and C. gracilis is one of sex only. 



" A single specimen in the Royal Dublin Society's collection is the 

 only one I have seen. 



" The specimen is shorter and more robust than C. gracilis; the seg- 

 ments are brought closer together ; the dorsal line of the kephalon and 

 pereion is more arched; the antepenultimate joints of the lower antennae 

 do not extend beyond the anterior margin of the carapace. I have, 

 therefore, thought it advisable for the present to retam Thompson's 

 name, rather than absorb the species into that previously described. 

 Having seen but a single specimen of each, I have not had the advan- 

 tage of dissection to compare their separate details." — On a new Genus 

 and new Species of Diastylidce, hy C. Spence Bate^ F. L. 8. : Journal of 

 the Royal Dublin Society, vol. ii., p. 101. 



Other members of the group have occurred on the coast of Galway to 

 Professor Melville, which I hope may be also brought at some future 

 period before your Society. 



Mr. Stephen M. Yeates exhibited a beautiful modification of the gas 

 microscope, showing its applicability to illustration of microscopic pre- 

 parations, as, owing to modifications in the structure of the instruments, 

 it is possible, at a very slight expense, to exhibit to an audience objects 

 which require high magnifying powers. Specimens of Arachnodiscus, 

 and dissections of many insects, were distinctly shown. Photographs 

 taken from objects by means of the instrument were also exhibited. 



The Chairman declared Mr. William Laughrin, of Polperro, duly 

 elected a Corresponding Member^ 



The Society then adjourned to November, 1858. 



Note on Fandalus Jeffrey sii {Spence Bate), andPandalus Leptorhyn- 

 eus (Kinahan). — A critical examination of Pandalus Jejreysiiy through 

 the kindness of its discoverer, has proved to me that the species of .£8op 

 prawn found by me at Sandycove, and recorded in the December Meet- 

 ing of the Natural History Society {vide ante), is distinct. The name 

 P. leptorhynchus must, therefore, as suggested provisionally, be applied 

 to the new species, P. Jeffreysii not yet being recorded as Irish. — J. R. 

 KiNAHAN, M. D., June 8, 1858. 



Note on Pagurus Ehlanensis, pp. 31, 32, 51.— On examination of the 

 typical specimens of Pagurus Ulidianus (Thompson), preeeryed in the 

 Belfast Museum, it appears that my surmise (p. 51 ) as to the identity of 

 P. Ulidianus and P. Ehlatxensis is well founded : the former name must, 

 therefore, fall. Extunination of liWng specimens, dredged by me in 

 Bangor Bay, county of Down, confirms this. The true range of the 

 species, then, is — 



P. Ulidianus, Belfast Bay, Portaferry (W. T.); Dublin Bay (J. R. K.); 

 Galway (A. G. M.).->r. R. K., August, 1858. 



