10 



ANNALES DE L'INSTITUT OCÉANOGRAPHIQUE 



they cannot be used for characterising these small areas; only numerous samples can show 

 which animals are of such common occurrence that they can be used. 



I shall not tire the audience with a further account of all the details regarding the 

 animal communities in Danish waters, but only point out that by means of some few 

 species, namely the characteristic ones, occuring in considerable quantities and having an 



N° 20 



8 miles W. of Vinga. — Clay : Depth 5o-52 meters. 



July io, 191 1. 



pr. im" 



Abra nitida 



Saxicava rugosa . . 

 Axinus flexuosus. 

 Nucula sulcata. .. 



Oylichna sp . 



Lumbrinereis fragilis. 



Glycera sp % . . 



Nephthys sp 



Cirratulus sp 



Eumenia crassa 



Maldanidae 



Ampharetidae 



Pista cristata 



Pectinaria auricoma . . 



Amphiura Chiajei. 

 Brissopsis lyrifera. 



Crustacea... 



Pennatula phosphorea. 

 Actiniidx 



Myxine glutinosa. 



Number 

 of animals. 



o,8 



1,2 



5,6 

 Fragm. 



9> 2 



0,4 



many 



a few 



0,4 



Fragm. 



12,0 

 4,8 



6,4 



0,4 

 0,4 



0,4 



Rough 

 weight. 



0,04 



0,65 



3,89 

 0,32 



i,3o 



0,32 



0,60 



0,28 



2,36 

 1 20,00 



0,72 

 0,48 



0,32 



2,92 



i58,6o 

 (9,008) 



N°46. 



3 miles N. N. W. of Hirtsholmene. — Clay with a 



little sand.— Depth i5 meters.- September 4, 1912. 



pr. 1 m* 



Abra nitida 



Macoma calcarea 



Solen pellucidus 



Cardium echinatum... 



Axinus flexuosus 



Montacuta ferruginosa 



Nucula tenuis 



— nitida 



Turritella terebra 



Cylichra cylindracea. . 

 Philine aperta 



Aricia armiger 



Nephthys sp 



Phascolosoma 



Nemertini 



Amphiura filiformis 



Ophioglypha albida 



Asterias rubens 



Echinocardium cordatum 



Portunus depurator 



Number 

 of animals. 



1 1 

 I 



i5 



1 



102 



3 



6 



78 



47 

 4 

 2 



Fragm. 

 Fragm. 



c. 3oo 



4 



1 



20 



1 



Rough 

 weight. 



1,20 



o,6o 



4,40 

 0,20 



io,5o 

 0,20 



22,90 



78,00 

 0,20 



I2,30 



0,10 

 8.40 

 o,3o 

 1,80 



38,20 



1,40 



2,00 



3 10,00 



1,80 



494, 5o 

 (27,10) 



Fig. 9. — Two valuations of 1 m* sea-bottom. Kattegat. 



even distribution, such as Molluscs or Echinoderms, / have succeeded in obtaining a survey 

 of the animal communities in our Danish waters. This survey is seen on the chart 

 fig. io, where the distribution of the different animal communities is shown by means of 

 ■curvesandcolours. Amatter of importance must, however, be mentioned here. The sea- 

 bottom in Denmark generally consists of ooze, sand or mud and is quite level especially in 

 deep waters; but stones often occur in patches at the bottom, and near land there is 

 also a vigorous growth of Zostera, Laminariae and other algae. Many species of animals live 



