Reproductive Organs of Spar%is Cent radon tus. 15 



egg-ridges. Small eggs are associated with these yellow bodies. 

 They are evidently the j^ellow glands that are seen in the developing 

 ovary. 



The January fish 42 cm. long had yolked eggs "37 mm. in diameter. 



Sehastes marinus (L.). 



According to Cuviev and Valenciennes,* Linnaeus included this fish, 

 and Pcrca scriha, L., under the name Perca marina, L. Muller named 

 it Ferca norvegica. The two French authors said that " its form is 

 nearly that of the Perch or of the large Serranus ; '" and further, '' it 

 is not a Perch, but a Sebastes similar to the form described hy 

 Delaroche under the name Scor^Kena dactyloptera." Cuvier and 

 Valenciennes gave it the name Sehastes norvegicus. Smitt, in 

 " Scandinavian Fishes," uses the name Sehastes marinus (L.). 



This fish is undoubtedly a Perca. It resembles Perca fluviatilis 

 very much in general shape, colouration, and external characters. 

 The chief difference lies in the dorsal fin, which is here a single long- 

 fin having two distinct parts. In Perca Jiuviatilis these two parts are 

 separate fins. The exclusion of Sehastes marinus from the genus 

 Perca does not appear to me to have been justified. The question is, 

 however, complicated by the other members of the genus Sebastes, 

 and especially by Sehastes dacti/lopterus, \\'hich is described in another 

 part of this paper. 



This fish, which is known as the Norwaj' Haddock, or Runkie, is 

 landed regularly by trawlers at Aberdeen. Large quantities are 

 brought from Iceland, but some are also got in the North Sea. 



Among the adult specimens examined there was a great difference 

 in size, so much so that there appeared the possibility that two species 

 were included under the same name. A comparison which was 

 instituted between the two lots of fish revealed no structural differ- 

 ence of importance. This question is referred to below. 



The general external appearance of the fisb is shown in Fig. 56. 

 The exact number of fin-rays has not been introduced into each fin. 



The fish is red or pink coloured externally. It exhibits a large 

 black blotch on the operculum, and a small blotch on the lower angles 

 of the operculum and sub-operculum. Dark-red or brown bars cross 

 the dorsum and extend down on to the side to a greater or less 

 extent. The bars are five i-n number. The first is over the opercular 

 region, the second and third are under the spinous portion of the 

 dorsal fin. The fourth is under the soft-rayed portion of the 

 dorsal fin. The fifth is on the root of the tail. In the small 

 specimens the bars extended down to and past the lateral line ; thej' 

 were of irregular shape, broadened out in one part and narrowing at 

 another. The fins are of a brilliant red ; the lower half of the 

 pectoral fin and the ventral and anal fins are especially so. The 

 inside of the mouth and phar3mx is white or pink-colom-ed. The 

 red colour gradually fades away after preservation. The black blotch 

 on the operculum is sometimes absent in some of the large fishes 

 landed (e.g., 38 cm. in length), and the bars can hardly be traced in 

 some examples ; these fishes had probably been iced. The inside 

 surface of the operculum has a small amount of black pigment. The 

 teeth in the jaws are numerous and small. Teeth are also present on 



* " Histoire Naturelle des Poissons, ' T. IV. Paris, 1829. 



