26 O. NORDGAARD [1915 



taleral carina easily falls away when the outer envelope is 

 removed. 



Some idea as to general dimensions may be gained from the 

 following measurements: 



Gulosen, February 1909. 

 Capsule 1. 1. 52 mm., b. 45 mm., long tubes abt. 50 mm., short 

 abt. 25 mm. 



2. 1. 52 mm., b. 45 mm., long tubes abt. 47 mm., 

 short abt. 20 mm. Length of interior cavity abt. 

 45 mm., b. abt. 30 mm. 



3. 1. 50 mm., b. 43 mm., long tubes abt. 50 mm., 

 short abt. 25 mm. 



V2 1910, Gulosen, abt. 80 m. snurrevad. 

 Capsule 1. 1. 65 mm., long tubes abt, 45 mm., short abt. 35 

 mm., con lents partly exuded. 



2. 1. 52 mm., b. 40 mm., long tubes abt. 48 mm., 

 short abt. 22 mm. Distinct embryonal formation. 



3. 1. 57 mm., b. 44 mm., thickness 17 mm., long tubes 

 abt. 70 mm., short abt. 30 mm., contents exuded. 



4. 1. 60 mm., b. 48 mm., long tubes abt. 60 mm., short 

 abt. 24 mm. Distinct embryonal formation. 



5. 1. 54 mm., b. 48 mm., thickness 15 mm. (vide fig. 6). 



13 /a 1913, Inderøya, abt. 40 ni. snurrevad. 

 Capsule 6. 1. 50 mm., b. 45 mm., length of internal cavity 39 

 mm., breadt of same 29 mm. Capsule brown in 

 colour, with no covering envelope of threads. 



Development of Raja radiata. 

 The capsule from Inderøya ( 13 /2 1913) was opened for in 

 vestigation from the dorsal side. The yolk mass, which was 

 oval in section, was 30 mm. long and 24 mm. bread. The yolk 

 was surrounded by a gelatinous mass, which also extended out 

 into the short and long tubes. Strange to sa} r , I was unable to 

 find, either in this or in any other of the capsules examined, 

 any trace of the fissures in the capsule tubes which are stated 

 as having been observed in the capsules of other Raja species. 

 It would also seem that the gelatinous mass in the tubes must 

 prevent any ingress of water. The incipient embryonal forma- 

 tion on the dorsal side of the yolk had a thin white disc in 

 front, the anlerior end abt. 5 mm. broad, but narrowing slightly 

 towards the rear. The smallest embryo detached from the yolk 

 was found in a capsule from Gulosen February 1909. Its total 

 length was 18 mm. (pl. I, fig. 1.) 



