ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 189 



marinus, the endoneural cell- vesicles, the tissue in the sinus of vibrissas 

 and in the rhomboidal sinus of birds, and the fatty tissue. Under com- 

 pact chordoid supporting tissue he discusses the notochord-tissue in 

 embryos and the remains of it in adults, the supporting tissue in 

 the tentacles of Hydroids and around the margin of Medusae, and the 

 so-called cartilage of Amphioxus. 



Eye of Pteropus.*— Walther Kolmer finds that the eye of Pteropus 

 stands quite by itself. It shows peculiarities of choroid and retina which 

 have no parallel among Vertebrates, at least beyond the limits of the 

 Megachiroptera. In Cynonycteris, another large bat, the choroid showed 

 the same peculiarities as in Pteropus, but the eyes of Microchiroptera 

 show no hint of them. One of the most striking peculiarities is the 

 development of a layer of cone-shaped elevations in the choroid. In 

 consequence of this the outer surface of the retina is not smooth as in 

 all other animals, but shows even on macroscopic investigation numerous 

 depressions or indentations. 



Thread-like Structures in Epidermic Cells of Tadpoles.f — N". 

 Loewenthal discusses peculiar coiled threads of considerable thickness 

 which occur in the cytoplasm of the cells of the epidermis in tadpoles. 

 They are quite smooth and homogeneous, and not composed of granules. 

 Therefore they cannot be mitochondria. It is possible that they repre- 

 sent chondriokonts. 



Threads and Granules in the Cytoplasm. — N. Samssonow $ has 

 found evidence in cartilage, connective-tissue, and epidermic cells, that 

 Flemming's threads and Altmann's granules are really the same. His 

 figures of similar cells treated with Flemming's mixture or by Altmann's 

 method are very convincing. 



F. Meves § has studied, in reference to the same question, the white 

 blood corpuscles of rabbit and rat, and brings forward evidence in 

 support of the conclusion, that Flemming's " Fila," Altmann's 

 " Bioplasts," and the chondriosomes or plastosomes of to-day are all the 

 same. 



Protoplasmic Fibres in Epidermic Cells. || — B. Kosenstadt has 

 studied the adult and embryonic epidermis of man and various other 

 types, with special reference to the fibres in the cytoplasm. They run 

 longitudinally, transversely, and vertically. Some of each direction go 

 from cell to cell through the intercellular spaces, forming the so-called 

 " bridges." The minute " knots," sometimes described as forming part 

 of the bridges, are really fibres in section. 



Supporting Elements in Sensory Epithelium. f — "W. Kolmer bar? 

 studied the sensory papillae of the asolotl, the taste papillae of mammal , 



* Zeitschr. wiss. Zool., xcvii. (1910) pp. 91-104 (1 pi.). 

 f Anat. Anzeig., xxxviii. (1911) pp. 55-67 (1 fig.). 

 J Arch. Mikr. Anat., lxxv. (1910) pp. 635-41 (1 pi.). 

 § Tom. cit., pp. 642-58 (1 pi.). 

 || Tom. cit., pp. 659-88 (1 pi.). 

 ^f Anat. Anzeig., xxxvi. (1910) pp. 281-99 (1 pi and 3 figs.). 



April 19th, 1911 



