335 APPENDIX. 



Fam. III. NAIDES (page 69). 



The Naides have been recently (1837) raised to the rank of a 

 separate class, under the name Somatotoma : see Ann. des Sc. nat. 

 vii. p. 101 (1847). Schmidt considers this a right proceeding: see 

 his interesting *' Observations sur 1' anatomic et la physiologie des 

 Naides," in Ann. des Sc. nat. vii. p. 189. 



Nais scotica (page 71). 



Body transparent, the anterior portion cylindrical, rounded and 

 obtuse at the end. Bristles shorter than the diameter of the body, 

 more than one in the place of insertion. 



" In some a yellow globule is seen towards the anterior, and in 

 one or two, white spherules have appeared. 



*' The food may be the minute Entomostraca, as a specimen of the 

 Cypris appeared in the intestine. This last organ is of variable 

 form, being divided into several sacs, of alterable appearance and 

 numbers. 



" The transparence of the animal completely exposes the internal 

 conformation. 



*' It dwells among the roots of the Iris and EquisetuMy not very 

 far from the surface of lakes and ponds." — Daly ell. 



It resembles Nais elinguis of Miiller, but in this the bristle is soli- 

 tary, or there is one only from the same point ; and N. scotica differs 

 from N. barbata in the form of the head, in the absence of eyes, and 

 in the bristles, which in N. barbata exceed the diameter of the 

 bodv. 



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