112 FREDERICK TILNEY AND LUTHER F. WARREN 



23. Cyclopterus lumpus. Cattle ('82). 60 In this form the 

 pineal organ is only rudimentary, being made up of a short, 

 conical body representing the stalk, while the distal part is 

 entirely absent. 



24. Lota vulgaris. Cattie ('82). 60 As in Gadus, the end- 

 vesicle in this species lies against the roof of the skull. The cells 

 in this vesicle are similar to those in Gadus. 



25. Pleuronectes platessa. Cattie ('82). 60 In this species the 

 stalk is solid and so also is the end- vesicle. The latter is highly 

 vascular and the stalk is very long. 



26. Lucioperca vitrea. Hill ('94). 18 In this species the 

 anlagen of both the parapineal organ and the pineal organ 

 appear. 



27. Lophius piscatorius. Studnicka ('96). 386 An end- vesicle 

 and a stalk are present in this form. The end-vesicle is in a 

 deep fossa. There are two types of cells in it besides the epen- 

 dymal layer, namely, neuroglia cells and sensory cells. Nerve 

 fibers were observed in the stalk. 



28. Cepola rubescens. Studnicka ('96). 386 A thin stalk with 

 an expanded end-vesicle sharply flexed forward is the charac- 

 teristic in this species. The lumen in both is conspicuous. The 

 end- vesicle is much convoluted and rests against the roof of 

 the skull. 



29. Anarrhichas lupus. Studnicka ('96). 386 In this form 

 there is a very long stalk, but no recognizable end- vesicle. There 

 is a tractus pinealis in the dorsal wall of the stalk and a plasmatic 

 lens in its lumen. 



30. Ophidium barbatum. Studnicka ('96). 386 In this species 

 there is a thin, long, hollow stalk and a very small but elongated 

 end-vesicle. There is no fossa in the skull and no tractus 

 pinealis, but many blood vessels accompany the stalk as far as 

 the end-vesicle. 



31. Arnoglossus lanterna. Studnicka ('96). 386 In this species 

 there is a hollow and long stalk with a well-marked end-vesicle. 

 This vesicle is vascular, but is situated in a position far removed 

 from the skull roof. 



