CETOCHILUS. 235 



" for it gives a faint idea, to speak of numbers .... On 

 looking into the water," he continues, " it was found to 

 be quite obscured by the moving masses of Entomostraca, 

 which rendered it impossible to see anything even a few 

 inches below the surface. But if a clear spot is obtained, 

 so as to allow the observer to get a view of the bottom, 

 immense shoals of cod-fish are seen swimming lazily 

 about, and devouring their minute prey in great quan- 

 tities. Occasionally small shoals of herrings are seen, 

 pursuing them with greater agility .... Great numbers 

 of Cctacea often frequent the neighbourhood of the island 

 at this time, droves of dolphins and porpoises swimming 

 about with great activity ; and occasionally an immense 

 rorqual may be seen, raising his enormous back at in- 

 tervals from the water, and is to be observed coursing 

 round and round the island." 



On one of his visits to the Isle of May, he observed 

 that at a considerable distance from the land, the sea had 

 assumed a slightly red colour, and that this became 

 deeper and deeper, the nearer he approached the island. 

 The water too, he noticed, presented a very curious ap- 

 pearance on the surface, as if a quantity of fine sand were 

 constantly falling upon it. At first he thought this 

 might proceed from light rain, but, upon more attentive 

 examination, he found both the red hue of the water and 

 the motion on its surface proceeded from an immense 

 number of small Entomostraca. Some of these he col- 

 lected, and found them to be a species of the genus 

 Cetochilus. 



1. CETOCHILUS SEPTENTRIONALIS. Tab. XXIX, fig. 1 a-y. 



Goodsir, Edin. New Phil. Jouru., xxxv, 339, t. 6, f. 1-11. 

 Baird, Trans. Berw. Nat. Club, ii, 156. 



animal is about one and a half, or 

 two lines long, of a bright red colour, and slightly trans- 

 lucent. The thoracic and abdominal portions of the body 

 are distinct, each portion being divided into six segments. 



