11 6 hepas matifera. 



Sparrows, finches, buntings, and other small birds, alike 

 under the pressure of the same necessity, do the same thin g, 

 and sometimes all in company, and sometimes all in the rook's 

 company. It is this necessity which is made a means — man 

 may interpret, and perhaps safely — of causing the appropri- 

 ation, the fruition, tjie preservation from waste, of every atom 

 of the liberal plenty provided in nature for all things formed. 



Cirri'pedes. — Upas anatifera (55 — 59.). — The following 

 remarks had been put in type, to be placed at the end of 

 Mr. Clarke's communication on the subject of them, but want 

 of space excluded them there : — 



Touch is the fundamental and elementary sense, of which 

 all the rest are mere modifications. It is, moreover, the 

 sense most universally diffused among animals, from man to 

 the polype, that feels even ; light. (Walker, in his treatise on 

 the Nervous System, Anatomical and Physiological, p. 147.) 

 The instance, noted by Mr. Clarke, of the lepas instantly 

 perceiving the incidence of light, proves that, although the 

 creature is destitute of the faculty of seeing, it is endowed 

 with that of feeling in an eminent degree : its feet, in their 

 structure (d), their joints, flexibility, contractility, extensi- 

 bility, and the numerous filaments with which they are 

 fringed, seem admirably adapted to the creature's exercising 

 of this faculty. The protective covering of shells given to 

 the more active part of the creature's person is consistent 

 with this imputing of active sensitiveness to the creature 

 itself. The peduncles of the lepases are flexible; and Dr. 

 Weatherill has ascribed to the species which he has noticed 

 in V. 339 — 342., the power of availing itself of this flexibility 

 in " extending, shrinking, and writhing itself at pleasure." 

 If one species possesses this power, it is probable that every 

 species does, in some degree. The possession and the exer- 

 cise of it provide an increased range of pasture ; and this 

 must conduce to the welfare of 'the animal. 



Dr. Weatherill has well remarked the difference of the 

 species he has noticed from .Lepas anatifera, in every indi- 

 vidual of the former being attached to the nucleus common 

 to the colony by its own distinct peduncle, and not clustered, 

 that is, branched off one another, as in the L. anatifera. 

 Compare fig. 76. in V. 340. with fig. 77. in V. 343. and fig. 9. 

 in VIII. 56. We owe an apology to Dr. Weatherill for 

 omitting, in V. 340., to explain that the words "Jig. 76. a 

 is about the ordinary length and size," have reference to Dr. 

 Weatherill's drawing, and not to our engraving, which is not 

 much more than half of the size, to the best of our recollec- 

 tion, of his drawing. 



