ZOOLOGY AND BOTANY, MIOKOSCOPY, ETC 111 I 



divided into the essential olfactory chamber with its rosette, and the 

 accessory nasal sacs which are of secondary importance. The author 

 discusses the varieties in the form of the openings, the occurrence of 

 valves in some forms, the varieties in the rosette and in the accessory 

 sacs. Water may play on the laminae of the rosette by the action of 

 cilia within the anterior nostril and upon the lining membrane of the 

 olfactory chamber, or by the deflection of water into the nose-cavity 

 during forward progression, or by the alternate dilatation and compres- 

 sion of accessory sacs connected usually with the hinder part of the 

 olfactory chamber. Bateson has shown that practically all Teleostei seek 

 their food by sight ; perhaps the rhythmical currents in the nose may 

 be of some use in testing the water used for respiration. There seems 

 to be very little evidence of any relation between the characters of the 

 olfactory organ and the habits of the fish. 



Mesencephalic Nerve in Ammocoetes.* — I). Tretjakoff describes a 

 very delicate nerve arising on each side from the mid-brain. It is the 

 N. thdlamicus of Hoffmann, but is more correctly called mesencephalicus. 

 It represents the second true metameric nerve of the front of the head. 



Variation in Mullet. f — L. Fage has studied the different appearances 



of mullet, distinguishing those due to age, to sex, and to habitat. He 



shows that the Linnean species Mullus barbatas and M. surmuletus are 



connected by intergrades ; indeed M. surmuletus may be regarded as an 



arrested form of the more evolved M. barbatas. He sums up in this 



schema : — , , ■ 



M. barbatas L. ; l i 4 t (southern type 



var. surmuletus u.\ ,, , jr 

 (northern type 



Zoology of Ruwenzori4 — W. R. Ogilvie-Grant organised an expedi- 

 tion to the " Mountains of the Moon," or Ruwenzori range in Equatorial 

 Africa, and he writes a preface to the zoological results. The collections 

 made included thousands of specimens, e.g. 404 Mammals, 2470 Birds, 

 135 Reptiles and Amphibians, 31 Fishes, 12 Crustaceans, 100 Arachnids, 

 1015 Beetles, and so on. An itinerary by R. B. Woosnam, who led the 

 expedition, is followed by reports on the Worms (F. E. Beddard), 

 Molluscs (E. A. Smith), Crustaceans (W. T. Caiman), Arachnids (A. S. 

 Hirst), Neuroptera and Urthoptera (AV. F. Kirby), Rhynchota (W. L. 

 Distant), and Diptera (E. E. Austen). 



IN VERTEBR AT A . 



Mollusca. 

 o. Cephalopoda. 



Development of Ccelomic and Vascular Systems in LoligoJ — 

 Adolf Naef gives an account of this intricate development. Some of 

 his conclusions may be briefly stated. The blood-vessels arise as spaces 

 in the originally thick " mesoderm." Their walls are formed by the 



* Anat. Anzeig., xxxiv. (1909) pp. 151-7 (3 figs.). 

 + Arch. Zool. Exper., i. ser. 5 (1909) pp. 389-445 (1 pi.). 

 I Trans. Zool. Soc. London, xix. (1909) pp. 1-100 (3 pis. and 12 figs.). 

 § Jenaische Zeitschr. Naturwiss., xlv. (1909) pp. 221-66 (3 pis. and 14 figs.). 



