ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 113 



the hasmoglobin is present in just such a sohition as enables it to utilize 

 these low tensions of oxygen to which the animal is subjected in a 

 habitat of badly aerated water. 



Sesamoid Articular Bone in Fishes.*— E. C. Starks has made an 

 extensive study of the occarrence of the sesamoid articular, a small 

 bone on the inner surface of the articular of fishes. It gives attachment 

 to a stout tendon from the adductor muscles of the mandible. It was 

 first noticed by Cuvier. It occurs in every group that is more highly 

 specialized than the primitive Clupeoid fishes. It is always in relation- 

 ship with Meckel's cartilage, and usually in very close association with 

 it. It often differs within a genus, and is of no use in the taxonomy of 

 groups larger than species. 



INVERTEERATA. 



Molluaca. 

 "■■ Cephalopoda. 



Spermatophores of New Cephalopod.t — Anna Vivanti discusses 

 Charybditeuthis macnlata, which she has previously established f as a 

 new genus and species. It was found at Messina, and seems to be an 

 abyssal form accidentally brought to the surface. The tentacles bear 

 photogenic organs. In the visceral sac of the specimen (a female) 

 there was a peculiar structure interpreted as a sponge. This turns out 

 to be a packet of spermatophores with an enormous number of sperma- 

 tozoa. It has been described by Mortara.§ 



y. G-astropoda. 



Two Generations of Nudibranchs in the Year.||— L. P. W. 

 Renouf finds that Lamellidork bilamellata (Linn.) breeds twice during 

 the first year of its existence and only once afterwards, and that the 

 same is probably true of Archidoris tuherculata (Cuvier). All the winter 

 to spring specimens and their spawn-spirals are large, the summer to 

 autumn specimens and spawn-spirals are small. 



Arthropoda. 



o. Insecta. 



Bee Disease. H —John Anderson reports some experiments which 

 point to the conclusion that Nosema is not the cause of Isle of Wight 



* Leland Stanford Univ. Publications, Univ. Series-, 1916, pp. 1-40 (15 figs.). 



t Rend. Roy. 1st. Lombardo, slviii. (1915) p. 233-7. 



: Arch. Zool. Ital., vii. (1914) pp. 55-79. 



§ Rend. Accad. Lincei, xxiv. (1915). 



II Proc. Roy. Phys. Soc. Edinburgh, xx. (1916) pp. 12-15. 



t Proc. Roy. Phys. Soc. Edinburgh, xx. (1916) pp. 16-22. 



Feh. 21st, 1917 i 



