Mr. ( ). Tliumas on n Ihird Sprcies o/' Nyctophilu3. 405 between tlie eyes and the cephalotlioracic gland.s on each side, and probably has an excretory function. In the two species examined tiiis organ exhibited considerable differences in structure. The organs are purely embryonic ; in the youngest epccimeiis of harvest-men which I was able to exan)ine 1 no longer found any trace of them. I failed to elucidate their fate during; the transition to post-embryonic life. This j)air of glands reminded me forcibly of the dorsal organ of the Mysidaa, as recently described by Nussbaum * and Butsch-inski t-Although I did not succeed in observing its first appearance, I nevertheless consider it to be very probal)le that it aj)pears, precisely like that of Mijsis (at least in the case of the second species of Phalavgium), in the form of an invagination of the ectoderm. Similar organs have been observed by Watase J in Liinidus, where they were also found to resemble the dorsal organs of My sis. Kingsley and Patten, however, consider these organs in Limulus to be of a sensory character §. As regards Phalangium the glandular character of " the lateral or dorsal organs " cannot be open to the slightest doubt, as is proved by the numerous concretions enclosed in their cells and their excretion to the exterior. LXI. — Description of a Third Species of the Genus Nyctoj)!nlus. By Oldfield Thomas. The genus Nyctophilus was in Dr. Dobson's ' Catalogue of Bats ' II considered to consist in 1878 of only a single species, the Australian Long-eared Bat, Nyctophilus timor.msis, a species with very much the facics, and evidently taking the place in Australia, of the European Long-eared Bat, Plecotus auritus. In 1888 ^ I had the pleasure of describing a second species of the genus from New Guinea, N. microtis^ which • Nussbaum, "Zur Embryologie von Mi/sis chama>leo," Zeitschr. Neuruss. Naturf. Gesellscliaft in Odessa, xii. Bd., 1887. t Butscliinski, " Zur Entwicklungsge^chichte der Mysiden," Zeitschr, Neuruss. Naturf. Gesellschaft in Odessa, xv. Bd., 1890. X Watase, " On the Sti-ucture and Development of the Eyes of Limu-Itcs" Johns Hopkins Univ. Circ. vol. viii. § Kingsley, "The Ontogeny of Limidm,'' Zool. Anz. 1890; Patten, ^' On the Origin of Vertebrates' from Arachnids," Quart. Journ. Micr. Sci. xxxii., 1890. II P. 172. 51 Ann. & Mag. Nat. Hist. (6) ii. p. 226. An7i. & Mag. N. Hist. Ser. 6. Vol. ix. 30
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