Bihliographical Notices. V?*-y 



it is suggosted, homologous with the tentaculiforous lobes of the 

 female, aud not with her lamelligerous lobe, which represents the 

 peduncle of the organ in the male. In the body of the animal two 

 metameres are recognized— the microhranchiate segment, containing- 

 the smaller gill, the outer osphradium, pericardial gland, kidney^ 

 and kidney opening, with the generative opening on the right side 

 and the opening of the pear-shaped body on the left; aad the 

 macroljraiuhiate segment, containing the greater gill and the inner 

 osphradium, pericardial gland, kidney, and renal opening. 



The XaatUns will eat freely any kind of animal food, is gregarious 

 and nocturnal, a ground-feeder, and probably breeds in deep water. 

 Captivity appears to interfere with the normal intercourse of the 

 sexes, so that all the eggs laid in the cages in which they were kepfe 

 l)roved unfertile. The eggs have a large brown yolk surrounded by 

 viscid, colourless albumen, which accumnlates at the poles. They 

 are laid in ridged capsules, within which is an inner capsule. 



While it is, of course, greatly to be regretted that Dr. Willey was 

 unable to follow the development of the young of this iraportartt 

 type, zoologists will find ample compensation for his want of success- 

 in the mass of valuable and interesting matter contained in the six 

 volumes of this series. 



On some Fossils from tJie Islands of Formosa and Hiu-Kia* ( = LoO' 

 Clioo). Journal of the College of Science, Imperial Universitif, 

 Tokyo, Jajmn ; Yol. XYIII. Article 6, 1902. 23 pages ; 4 plates, 

 10| by 7| inches. By K. B. Xewton aud K.. Hollaxd. 



The geological fact that certain similar kinds of fossils occur at 

 great distances apart on the Earth's surface has received the careful 

 attention of competent naturalists, as indicating that marine con- 

 ditions must have formerly extended where now either the ocean 

 exists or both land and water constitute the surface. The occurrence 

 of similar species at separate localities may be either in quite con- 

 temporaneous groups, or in an analogous succession of strata, not 

 simultaneous, but homotaxial. In either case the types have been 

 persistent, but their habitats have been disturbed by alterations of 

 the levels of land and sea ; and the earlier forms are still buried in 

 Bome unworked area of the world-wide strata. 



The finding oi JJonotis I/ftwai, oi probably Permian or Permo- 

 Triassic age (page 4), in Formosa is a strikingiustance of the occurrence 

 of an isolated remnant of un ancient gtological fonnation, like the 

 existence in both Europe and India, and even in America, of portions 

 of the same great formation. Strata of later date (Cretaceous and 

 Tertiary) have been traced at intervals as still existing patches and 

 ranges elevated above the sea-level. Thus the great Xximmulitic 

 Formation has left its western extremity recognizable as shaUow- 



* Equivalent to the " Loo-Choo " of modern maps. It is not spelt 

 thus iu the Monopranli, hut as Riii-Kiu and Riu-Kiu. 



