30 



O. NORDGAAHI) 



[1915 



60 mm. laken from a capsule from Gulosen V2 1910, capsule 4, 

 this juncture bad laken place (figs. 8, 9). The oral disc has 

 now al ils fore end grown out inlo a point, reaching nearlv to 

 a level with Ihe fore end of the head. In the object itself, the 

 suture of the joint is distinctly visible, although it is not appa 

 rent in fig, 9. On holding the object up to the light, the pec- 

 toral fin rays are also visible right up to this suture. The mouth 

 and olfaclory organs are approaching their ultimale form. There 

 is no pigment formation either on the upper or under side ex- 

 eept in the eve. The so called »eyelid« distinctl} r apparent, with 

 small linger-shaped lobes at the edge. The yolk sac is still 



Fig. 9. Embryo oi' R. radiata from Gulosen, Va 1910. capsule 4, total 

 length abt. 60 mm., vcntral view. 



comparatively large, with a lenglh of 25 mm. and breadth 19 

 mm. The ventral fins present a dislinct indication of division, 

 and the anal lin is clearly apparent (fig. 9). The gill threads 

 are still present, and there are 15 of these in each row of gill 

 slits, i. e. 80 in all. The dorsal fins are in their original posi 

 tion; distanee from 2. dorsal fin to point of tail 16 mm. The 

 spines in Ihe dorsal line now indicated as small knols under 

 Ihe skin. The two scapular spines also are seen in their inci- 

 pient stage as two small knots. The lateral folds of the caudal 

 part are now beginning to appear. 



Finally, we have a capsule from Gulosen, Febr. 1909, con- 



