the lAiminosity of the Sea, 509 



fancy formed," I should be rather inclined to imagine that 

 this is one of the inconceivable number of the "ways" of 

 the Great Creator in " the great deep," which, at least as yet, 

 are " past finding out." 



2. With respect to the crustaceous animals which have 

 been recorded by Mr. Baird in his former and the preceding 

 memoir, I can but regret the difficulty under which he (in 

 common with Macartney, Thompson, and others, who have 

 observed these animals at sea) laboured, in not being enabled 

 to examine and describe the very minute objects of his inves- 

 tigation with that degree of delicate accuracy which the 

 recent researches of Strauss, Jurine, &c., have shown to be so 

 indispensable to the true knowledge of their structure. 



With respect to the Limulus noctiliicus of Macartney, 

 which Dr. Leach regarded as belonging to a very different 

 undescribed genus, I may observe that Mr. Thompson has 

 described its characters and luminous properties under the 

 name of Sapphirina indicator, and that he considers it as 

 referable to the group of Monoculi near Cyclops. 



The crustaceous animalcule figured by Mr. Baird (Vol. III. 

 p. 315. fig. 83. d) certainly belongs (as Mr. Baird considers) to 

 a new genus, if it really possesses a pair of lateral eyes ; in 

 other respects it resembles the one-eyed genus Cyclops, to 

 which e and/" (Vol. III. fig. 83.) are certainly referable : the 

 latter appears to approach the Cyclops minutus of Miiller 

 (Monoculus staphylinus of Jurine and Desmarest), with which 

 it agrees in the length of the antennae and two long caudal 

 setae. In the engraving these two setae are accidentally united 

 at the end, giving the appearance of a long cylindric tail. 

 MUUer obtained this species not only from stagnant water, 

 but also from the waters of the coast of the Baltic. 



The singular animal fig. 83. g (Vol. III.) appeared to me^ 

 at the first, to be the young state of some species of Cyclops, 

 which Miiller, supposing to be perfect animals, formed into 

 two genera. The possession, however, of two lateral eyes, 

 sufficiently separates them ; but, as it was found by Mr. Baird 

 in the Straits of Malacca, where it would appear that fig. 83. d, 

 was also captured, it does not seem improbable that it may 

 be the young state of that insect : especially since, from a 

 general comparison of Miiller's figures of the young and per- 

 fect Cyclops, I feel but little hesitation in regarding it as not 

 arrived at its adult state. The same observation seems, also, 

 to apply to figs, h and /. The form and structure of these 

 two extraordinary animals are perfectly distinct from any 

 thing hitherto recorded, and it is only to be regretted that 

 more highly magnifying powers were not employed in their 

 examination. From the very interesting account of the 



