IV. Pisces für 1898. 27 



— (3). Recherches sur ranatoinic et TliLstologie du Silurus f^lanis L. 

 In: Arch. Sc. Med. Bucarest, 3. p. 101— 152. 13 Taf. — Ref. von 

 H. Klaatsch in: Zool. Centr. (3. p. 681. 



Jaekel, 0. (1). Die verschiedenen Rochentvpen. In: Sitz.ber. 

 Ges. naturf. Freunde Berlin 1898 p. 44—53. Ref. in: Zool. Centr. 3. 

 p. 408. 



Verf. unterscheidet folgende Typen : I. Petaiodontidae : Unterfani. 

 Janassinae, Polyrhizodontinae u. Pristodontinae. IL Psammodontidae : 

 Unterfam. : Psamniodontinae, Helodontinae und Psephodontinae. 

 III. Centrobatidae : Unterfam.: Ptychodontinae, Trygoninae . Myli- 

 batinae u. Ceratopterinae. IV. 8quatinidae. V. Rhinorajidae; Unter- 

 fam. Rhinobatinae, Torpedininae u. Rajinae. 



— {%). Ueber Hybodus Ag. Ebenda p. 135— 14(). Ref. in: 

 Zool. Centr. 6. p. 408. 



Die verschiedenen unter dem Namen Hybodus Ag. bisher zusammen- 

 gefaßten Formen verteilt Verf. auf folg. Gattungen: Hybodus Ag. 

 für die von Agassiz beschriebenen Flossenstacheln, wälirend für die 

 Hybodusartigen Zalinf ormen flg. Namen zu verwenden sind : Polyacrodus 

 Jaek., Orthyhodus w. g., Orthacodus Sm. Wd., Nemacanthus Ag., 

 Pachybodus ii. ji. 



— (3). Verzeichnis der Selachier des Mainzer Oligocäns. In: 

 Sitz.ber. Ges. naturf. Freunde Berlin 1898. p. 161. 



1 Notidanus, 2 Odontaspis, 1 [ii.] Oxyrrliina, 1 Carcharodon, 

 1 [n.] Scyllium, 1 [ii.] Galeus, 1 Galeocerdo, 1 [n.] Scoliodon, 1 [n.] 

 H yproprion, 1 Squatina, 1 Myliobatis. 



Jatzow. R. und Lenz, H. Fische von Ost-Africa, Madagascar 

 und Aldabra. In: Abh. d. Senckenb. Ges. XXI. p. 497—531. Taf. 34—6. 



Jolmston, J. B. (1). Hind Brain and Cranial Nerves of Acipenser. 

 In: Anat. Anz. XIV p. 580—602. 13 Figg. 



Selbstresume : The sensory V th., VIII th.. and lateral line nerves 

 enter common centers, namely, the Nucleus funiculi, tuberculum 

 acusticum and the granulär layer of the cerebellum. A large part 

 of the V th., VIII th., and lateral line f ihres go as arcuate f ihres to the 

 opposite side. The lobus trigemini of Goronowitsch is shown by its 

 structure to be a part of the tuberculum acusticum. There is continuity 

 of structure between the acusticum and the granulär layer of the cere- 

 bellum. In fact, the acusticum w i t h the c e r e b e 1 1 a r c r e s t 

 corresponds in every detail writh the cerebellum and the one may be 

 considered as the direct continuation of the other. A large bündle of 

 fibres runs from the tuberculum acusticum to the Nucleus funiculi 

 and to a special Nucleus acustici spinalis. The cells of the tuberculum 

 acusticum send their dendrites to the base of the medulla. There is a 

 secondary tract from the acusticum, which joins the spinal V th. The 

 sensory VII th., IX th., and X th. nerves (exclusive of lateral-line 

 and spinal V th. constituents) enter a common, center, the lobus vagi. 

 The secondary vagus tract divides into ascending and descending 

 bundles. The ascending bündle ends in the Rindenknoten as described 

 by others. The descending bündle extends into the cord. Cells of the 



