380 Mr. a. Lfwis on 



coiitainctl;" he terms the blood-corpuscles simply" unicellular 

 movable srlands," and, with ret'crenc" to the chemical nature ot" 

 the secretion, " g-lobulin-containin,i^ albumen-inlands." In the 

 second ])lace, so far as can be judt^ed from his publication, 

 Loewit onlv examined the blood which tiowed from a wound 

 on tlie body or wliich was drawn i\\) from between the or^'ans 

 by a pip( tte ; it is conspquently a permissible hypothesis that 

 centres for the regeneration of blood-corpuscles exist in the 

 crayfish as in the Insects (see p. 213 of this volume of the 

 * Biologisches (3entralblatt '), which, from a jdiysiological 

 HtandjX)int, would be comjjarable to the lymphatic glanils of 

 Vertebrates, and in which the division of the cells may take 

 place by mitosis. If this is the case it does not appear 

 lemarkable that amitotic nuclear division occurs in the blood- 

 corpuscles circulating in the body, which, indeed, have an 

 assimilating and a secretory function. A short time ago 

 CiK^not (Archives de Zoologie, exp. et gen. 2' serie, t. ix., 

 1891, pp. 78 and 83) observed in the crayHsh in the gills and 

 in the neighbourhood of the heart '' gh^ndes lymphatiques,"' 

 which he regards as the centres for the regeneration of the 

 blood-corpuscles. I believe therefore that it has not been 

 conclusively proved by Loewit's investigations that a 

 "regenerative" amitotic nuclear division exists. I miy 

 incidentally nMnark that Dr. vom ilath has shown me a seri -s 

 of sections of a young tisli louse ( C'///«oMoa, sp., from Naples, 

 5 niillim. long , in which mitotic division of blood-corpuscles 

 was abuii'iantly visible. 



XLIX. — On new Species o/'Histe,rid«. By George Lewis. 



This i)apcr is the seventli of a series published in this Maga- 

 zine on the llisteridai, and in the Hfth memoir, that of June 

 1885, the estimate of known species was given as l48o, 

 Avhic h included those given in the Munich Catalogue and in 

 iSchniidt's List ol' 1884. Siice this assessment was made 

 nearly 450 species have been noticed by various authors ; but 

 these figuris include those of this paper and 1(3 of a paper in 

 the press recording new species from Burmah, ami do not 

 note any reduction in the general number which may have 

 arisin through the adjustment of the synonymy. Taking the 

 total, then, as it stands now at 1850 species, it cannot be said, as 

 regards their present numb>'rs, that the Histeridse are a very 

 inij»urtaut tauiily in the Colenjiteia ; but there are several 



