ANALOGIES OF THE ANNULOSA. 35 



tions of the vertebrate and annulose kingdoms, which 

 have been illustrated in this manner in our former vo- 

 lumes. 



(31.) The resemblance of the barnacles to marine 

 shellfish is so strong, that to this day they are confounded 

 with them by collectors; while even Linnaeus, from not 

 being acquainted with the true structure of the animal, 

 fell into the same error, and classed them with the Mol- 

 lusca. Here, then, we have a strong instance of that 

 principle which nature invariably acts upon in the con- 

 struction of all her productions : we have one group of 

 animals representing another ; and this so completely, 

 as to deceive both the learned and the ignorant. Now, 

 the only way in which this popular association of the 

 barnacles with the shelly Testacea can be clearly de- 

 monstrated, is, by comparing the two groups together, 

 and applying to their component parts the test of ana- 

 logy. Unfortunately, the natural series of the Cirrhi- 

 pedes among themselves is unknown. There can be 

 little doubt, however, that the sessile and the peduncu- 

 lated divisions form the two typical groups ; and these 

 furnish us, of course, with the chief characters of the 

 whole class. We can thus compare the primary divi- 

 sions of the Annulosa, one of which is the Cirrhipedes, 

 with the five great divisions of the animal kingdom, 

 the Mottusca being unlike any one of the latter. The 

 following table shows these two series, with their divi- 

 sions and analogies : 



Analogies of the ANIMAL KINGDOM to the ANNULOSA. 



Series of the A . . Series of the 



Animal Kingdom. Analogies. Annulosa. 



VERTEBRATA. Metamorphosis imperfect, or none. APTERA. 

 ANNULOSA. Metamorphosis perfect. PTILOTA. 



RAIMATA ("Head indistinct, or none; body 7 Aluv 



i with radiating appendages. j ANNELIDES. 



ACRITA Body sim P le > without members or 7 VPRMFS 



i appendages. 3 



MOLLUSCA. pody protected by a shelly cover- j CIHRHJPEDES. 



