ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 35 



Development of Limbs in Salamandrella kayserlingii.* — J. J. 

 ■Sckmalhausen kas made a careful study of tke development of tke limbs 

 in tkis Urodele, wkick shows several remarkable peculiarities, e.g. in 

 the position of the intermedium entirely between the primordia of the 

 ulna (or fibula) and the radius (or tibia), and in the disposition of the 

 hasipodials in longitudinal rays. The author thinks that the evidence 

 goes to show that the Protetrapoda had five centralia, a prre-kallux in 

 front of the hallux, a postminimus behind the fifth digit, and an arrange- 

 ment of the elements in regular rows, as if they were the results of the 

 division of the fin-rays of a fish-like ancestor. 



Teleostean Ova and Larvae.f — A. E. Hefford gives an account of a 

 large number of Teleostean ova, both pelagic and dimersal, observed at 

 Plymouth. Among the pelagic forms described may be noted gold-sinny, 

 gaper, scad, boar-fish, dragonet, sole, solenette, top-knot, whiting, rock- 

 ling, frog-fish, and sprat. Among the dimersal forms dealt with may be 

 noted the shanny, the cornish sucker, and the john-dory. 



b. Histology. 



Insterstitial Tissue of Striped Muscle.! — J- Hirschler concludes 

 that the " trophospongia nets " in the wing-muscles of Insects (that are 

 rich in plasma), in the heart-muscle of Vertebrates, or in the muscles 

 of the crayfish, correspond to the basal membranes of these muscle- 

 fibres (and in the frog to the middle membrane as well). The "tro- 

 phospongia nets" in the skeletal muscles of Vertebrates are identical 

 with the sarcosome rows of Krause and Retzius. The " trophospongia 

 nets " in the skeletal muscles of Insects are identical with similar sarco- 

 some rows. What Holmgren has described as exogenous and new 

 structures are endogenous and essential parts of the muscle-fibre. 



Direct Division of Red Blood Corpuscles in Scorp8ena.§ — E. Mencl 

 observed two cases of the direct division of red blood corpuscles in 

 S'corpsena porcus. An elongated dumbbell-like form was seen, with 

 rounded contours round the two halves, and with the normal relations 

 of cytoplasm and nucleoplasm. 



Cartilage in Thymus of Rat.|| — Tomaki Toyofuku found hyaline 

 ■cartilage in the apex of the thymus in two cases. It has been shown by 

 Erdheim that there are in the rat's thymus various epithelial vesicles and 

 cysts and corpuscles of branchiogenous origin (from the third visceral 

 cleft), and there can be no doubt that the piece of cartilage, which has 

 been shown by Toyofuku to occur in a few cases, is derived from the 

 branchial arch. 



Ligaments of Oviduct of Domestic Fowl.f — M. Curtis gives an 

 account of the anatomical structure of the ligaments of the oviduct in 

 the domestic fowl, the investigation of which he was led to undertake by 



* Anat. Anzeig., xxxvii. (1910) pp. 431-6 (1 pi. and 7 figs.). 

 t Journ. Marine Biol. Assoc, ix. (1910) pp. 1-58 (2 pis.). 



I Bull. Internat. Acad. Cracovie, 1910, pp. 448-76 (1 pi.) 

 § Anat. Anzeig., xxxvii. (1910) pp. 539-40 (1 fig.). 



II Tom. cit., pp. 573-5 (1 fig.). 



i Maine Agric. Stat. Exper., Bull. 176 (1910) pp. 1-19 (9 figs.). 



D 2 



