54 



did not find them iu less thau ca. 20 fathoms water, except for a single specimeu, 

 6—7 cm., taken north of Fuuen in 11 fathoms on October 12th. Ou the other 

 hånd we found the 3'oung of the loug-young dab in deeper water thau the dab 

 young, as for example in the Skager Rak: 



D. 26—7—04. Skaw lightship in S. W. '/4 W., 4 miles, 60 fm. Small English trawl, 

 45 minutes: 12 lotig roiigh-dab, three of which were young, 3, 3 and oV._. cm.; also, many other fishes. 



As the bottom-stages of the long rough dab thus only occur in deep water, 

 their distribution in Danish waters is very Hraited. In sufficiently deep water, ca. 

 30 fm. and soft bottom, however, we have seldom sought for the bottom-stages 

 without result. We have found them even in the western Baltic: 



D. 17—8 — 04. W. of Lyø, 20 fm., soft bottom. Young-fish trawl on bottom, 5 minutes: 

 6 long-roiiijh dab, 4 of which were young, 2'/._. — 4 cm. 



2. Species with demersal eggs. 



Oommon sea-scorpion, Cottus scm-pius, and Loug-spiiied sea-scorpioii Cottus bubalis. 



In the spring of l'JOS, when investigations of the pelagic life were being 

 carried on by the Biologicai Station in Fænø Sound and ueighbouring jDarts of 

 the Little Belt, some attention was at the same time paid to the determination øf 

 the spawiiing-period of our two species of Cottus and their other biologicai cha- 

 racteristics. This was so much the simpler as a large number of both species 

 at all sizes occurred in the neiglibourhood of "Stationen's" anchorage, so that we 

 were able to collect a good material by the aid of various apparatus. Johs. Schmidt, 

 who was assistant at the Biological Station in 1902, gives a description of these 

 investigations iu the journal, and I shall keep in the main to his description in 

 giving an account of the spawning of the two species of sea-scorpion. 



D. 3 — 4 — 02. Fænø Sound. One longspined Cottus, placed in the well at the Station 

 has spawned there. 



A description of tlie appearance and size of the eggs is added in the 

 journal, but as Elirenbaum in "Eier und Larven von Fischen der deutschen Bucht 

 III. Fische mit festsitzeuden Eiern" (Wissenscli. Meeresunt., Neue Folge, VI Band, 

 Abt. Helgoland, Heft 2, 1904) has given a description of the eggs of Cottus buba- 

 lis, I find no reason for publishing Johs. Schmidt's description, which would be 

 almost a repetition of Ehrenbaum's. 



D. 1 — 5—02. At Fænø. Fishing for Cottus with seines and hook.s. Result: ca. 50, 

 only two of which were the longspined Cottus, the remainder the coiiiiuon Cottus. 



D. 6 — 5 — 02. At Espenhoved at below Hindsgavl, '/s fti^-j shrimp shove-net and trawl. 

 A number of small Cottus (2 — 4 inches) of both species, most long-spined species, were taken. 



D. 7 — 5 — 02, Searched the Fucus clumps at Fænø Kalv with the shrimp shovenet. 

 Some specimens of the longspined Cottus were taken ; also, eggs of the same species. 



D. 9 — 5—02. Off Anker S. of Fænø. C'ottids (almo.st e.xclusively the long-spined species) 

 were taken here at low water in the Fucus with shrimp shovenet. Most of the sjjecimens were 

 large, and all these had well-developed reproductive organs, yet eggs were only running from a 

 few. The spawn (with rough, warty capsnles) was also found on the Fucus and stones to which 

 the Fucus was iixed, yet not so abundantly as on the 7th at Fænø Kalv. 



All the cottids taken near Fænø in the beginning of May were measured. 

 The measurements are given on the lists p. 58 and p. 59. Tlie following remarks 

 accompany the measurements in the journal: 



