ZOOLOGICAL RESEARCHES. 



jVIEjMOIR VI. 



Developerncnt of *4rtemis Snlinus, or Brine Shrimp; 



demonstrative of its relationship to Branchipus and the other Crust a ceous 

 Phyllopoda, and to those enigmatical Fossils, the apparently eyeless 

 Trilobites.. . with a new species of Artemis and of Ajms. 



Amongst the Fossil remains of animals, it may be remarked, that 

 some have no existing t}'pe, that others present a doubtful character, 

 while many are indisputably allied to some of the members of the 

 present race. . .of this last description are the Trilobites with evident 

 eyes, now forming the Genera of Calymena and Asaphus, and which 

 aree\ndently related, through Apus (PI. 6, f. 3), to the Crustaceous 

 Phyllopoda; of the first description, have been regarded, the appa- 

 rently eyeless Trilobites of the Genera Ogygia, Bucephalithus, and 

 Paradoxides, and which it is one of the objects of the present Memoir 

 to show, are equally related to the sam.e tribe, through Artemis, now 

 for the first time described with the requisite detail. 



The immense quantity and great variety of animal remains, im- 

 bedded in the rocks which compose the crust of our globe, has so 

 identified the study of Geology and Zoology, that the student of the 

 former science, can no longer prosecute it in a satisfactory manner 

 without the aid of the latter, neither will a slight knowledge of Zoolo- 

 gy avail, as may be learnt from the substance of the present 

 Memoir, and from the unavailing guesses of the older Naturalists, as 

 to the type of the Trilobites, many believing them to be trilobed 

 shells, (as Schreber, Lehmann, Klein, Luyd, Wolstersdorf, &c.). . 

 others likened them to the Chitons (Sclotheims), others to the Onisci 

 (Walch), and some even regarded them as aquatic larva, and the 

 Bucephalithus (PI. 5, f. 1) in particular, as having some affinity 

 with the Scolopendra ! (Beckman). 



Satisfactor]/ as it may be to the Philosopher, the Geologist, and to 

 the Natural Historian, to be able to discover and point out the ana- 

 logies which connect the fossilized with the existing race of animals 

 and plants,* we shall perceive, that it is no less important to deter- 

 mine the exact species which any particular bed or formation pre- 

 sents to our view, these bodies being found to determine with much 

 greater certainty, the identity of mineral deposits, than characters 

 taken from the Rocks themselves, which every experienced Geologist 

 knows to vary considerably in colour, density, and many other par- 

 ticulars, even within a very limited distance ; they declare even more 

 in regard to strata, by pointing out the respective Epocha of their 

 formation, and hence, have been emphatically termed, the Medals 

 of Creation. 



• See my Jleinoir on Peiitacriuus Euraprens. 



