28 IV. Pisces für 1898, 



II th. type are foiind in the lobus vagi, the acusticum and in botli 

 layers of the cerebcUum. A reniarkable cell of the II th type found in 

 the val Villa has dendrites similar to those found in the Purkinje ccUs 

 and a very coarse neurite with peculiar cliiblike thickenings. Meynert's 

 bundles have two sets of fibres, one of which after decussating cnds in a 

 nucleus dorsal to the ansiform coniniissure and bordering on the central 

 cavity at the posterior end of the basc of the niid-brain. The other, 

 composed of fine fibres, probably ends, after partical decussation, 

 in the granulär layer of the cerebellum. The Corpus interpedunculare 

 is probably a nucleus of secondary importance in connection with the 

 bundles of Meynert. — Theoretische Schlüsse: The cranial 

 sensory nerves are arranged in two quite distinct coniplexes. The 

 sensory V th., VIII th., and lateral line nerves alone are homologous 

 Avith the sensory roots of the spinal nerves. The tiiberciilum acusticum 

 and the cerebellum are the rcpresentatives in the bind brain of the 

 dorsal horns of the cord. There is in Acipenser a spinal VIII th., which 

 is probably homologous with that in man. The sensory VIl th., IX th., 

 and X th. nerves are not homologous with any nerves in the trunk 

 region. The Lobiis vagi has no homologous or only a rudimentary 

 homologue, in the spinal cord of the adult. The sensory roots of the 

 cranial nerves can not be considered as serially homologous with (the 

 dorsal roots of) the spinal nerves in determimy the segmentation of the 

 brain or head. The motor roots alone are directly comparable to 

 (the ventral roots of) the spinal nerves. The peculiar character of 

 the Purkinje cell dendrites seems to bc due to their physiological 

 relation with the very fine fibres of the molecular layer of the cerebellum. 



— (3). The olfactory Lobes, Fore-Brain and Habenular Tracts 

 of Acipenser. A Summary of Work on their Minute Structure. In: 

 Zool. Bull. Boston. Vol. Lp. 221—41. 5 Figg. — Ref. in: Zool. Jahres- 

 ber. 1898 p. 153. 



Jordan, D. S. (1). Description of a species of Fish (Mitsukurina 

 owstoni) from Japan, the type of a distinct Family of Lamnoid Sharks. 

 In: Proc. Calif. Ac. (3) Lp. 199—201. pls. XI— XII. 



— i'i). Agassiz on recent Fishes. In: Amer. Natur. 32. p. 173 — 6. 

 Mitsukurina n. g. mit Carcharias am nächsten verwandt; Skelett 



flexibel, die Schnauze klingenförmig verlängert, die hintere Kiemen- 

 öffnung über der Basis der Pectoralien, alle Flossen niedrig, der untere 

 Lobus der Schwanzflosse lang. 



Jordan, D. S. and l'hernianu. 15. >V. The Fishes of North and 

 Middle America : A descriptive C'atalogue of the species of Fish - like 

 Vertebrates found in the waters of North America, North of the Isthmus 

 of Panama. Pts. II a. III. In: Bull. U. S. Nat. Mus. No. 47. p. 1241 

 — 3130. 



Beschreil)ungen, Bcstimmungstabellen, l^iteratur, Verbreitung, 

 l'iirt 11 bringt Foitsetzuug von den Teloostonii, von der Familie Luti- 

 anidae an. und b(*sc.lireil)t lli>. Kaniilicn und Arten: 



