THE DISCOBOLI. 31 



coral on its upper face. This nerve is much longer than in Liparis. 

 Small Lump-fishes show each hemisphere to he rather smaller than the 

 cerebellum ; in large ones the cerebellum is smaller than the hemisphere. 

 In the small ones, again, the optic nerves are larger than the olfactory, 

 but with age the latter gain more than the former. As in Cottus, the 

 optic lobes are much larger than the hemispheres; the disproportion is 

 greater than in the Liparids, as may be seen by comparing Figure 1 with 

 Figures 4 and 9 of Plate VIII. The optic nerves partly originate in the 

 inferior lobes. The epiphysis is neither large nor prominent. The cere- 

 bellum is nearly equal in size to one of the hemispheres, varying with 

 age ; on each side of it and behind it a considerable portion of the rhom- 

 boidal sinus is exposed. Toward the sinus and at its sides the medulla 

 is broadened ; the restiform bodies make a slight prominence behind each 

 of the optic lobes. The infundibulum being very short, the hypophysis is 

 sessile ; its central portion lies below the meeting of hemisjjheres and 

 optic lobes. The inferior lobes are of moderate size ; at their posterior 

 extremities they form a transverse prominence, extending down behind 

 the heart-shaped hrematosac. The spinal chord extends nearly or quite 

 to the end of the column ; it is without glandular enlargements. 



Early Stages. 



Plates XII. and XIII. 



The following account of the young stages of the Lump was published 

 by Prof. Alexander Agassiz in the Proceedings of the American Academy 

 of Arts and Sciences, Vol. XVII. p. 286, Plates IV. and V., 1882. With 

 his permission, both the plates and the accompanying text are here 

 reproduced : — 



" In the youngest stage of this species I have had occasion to examine 

 (Plate XII. Fig. 1), measuring 4 mm., the caudal fin was already partly 

 separated from the dorsal and ventral embryonic fin. The spiny rays 

 were also indistinctly indicated in those fins. The pectorals were large, 

 the rays gradually diminishing in length towards their junction with the 

 sucking disk (the modified ventrals on the abdominal side). The anterior 

 dorsal is formed evidently, as in Lophius, at an early stage, and separates, 

 as in that genus, the anterior and posterior parts of the embryonic dorsal 

 fin. The younger stages of Lumpus (Plate XII. Figs. 1-4) are noted for 



