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M. V. L. BENNETT
L
Fig. 38. Brains of fish with and without electrosensory systems. ( A ) Trout, Salrno
fario (from Nieuwenhuys, 1967); (B, C ) dorsal and lateral views, buffalo fish,
Carpiodes (from Herrick, 1905); ( D ) squirrelfish Holocentrus (from Meader, 1934);
( E ) stargazer Astroscopus. ( F ) thornback ray, Platyrhinoides triseriata (from
Nicholson et al., 1969); ( G ) catfish Leptops (from Herrick, 1905); ( H ) electric eel
Ekxtrophorus (from Couceiro and Fessard, 1953); ( I ) mormyrid Gnathonernus
(from Nieuwenhuys and Nicholson, 1969a); and ( J ) mormyrid Mormyrops (from
Stendall, 1914). Abbreviations: C, cerebellum; L, lateral line nerve; 01, olfactory
bulb; Op, optic tectum; V, valvula of the cerebellum; VL, vagal lobe; and 111,
oculomotor nerve.
lum in electroreception. Volleys from electroreceptors have been observed
to project to the lateral line lobes, midbrain, and valvulae of the cerebellum in mormyrids (Bennett and Steinbach, 1969; B. Zipser and M. V. L.
Bennett, unpublished data). Morphological studies indicate the cited
order is the actual pathway, but projections of cerebellar outputs have
not yet been identified (Nieuwenhuys and Nicholson, 1969a). Physio-