for the Microscope. 73 



the pads, with their trumpet-shaped tenant hairs, should 

 be examined. 



543. COMPOUND EYE. Many insects are at hand to 

 furnish compound eyes, that is, eyes composed of innu- 

 merable hexagonal segments, each of which is believed to 

 perform the office of a simple eye 



544. PROBOSCIS OF BUTTERFLY ( Vanessa Urticce). 

 It is better to mount the entire head of such a butter- 

 fly as the Small Tortoiseshell, so as to show the com- 

 pound eyes, the antennae, and the coiled proboscis at one 

 view. 



545. WING OF HOUSE-FLY (Musca domesticd) is beau- 

 tifully iridescent under the microscope, especially if the 

 light be well managed. It is best to use a Lieberkuhn 

 (. Marks). 



546. PLUME MOTH WING (Pterophorus pentadactylus). 

 One of the plumes or an entire wing of the White 

 Plume Moth. Each plume is fringed along each side 

 with delicate white hairs. 



547. HEAD OF CORETHRA (Corethra plumicornis^.lte 

 head of this common gnat-like insect, with its plumed 

 antennae, is a very pretty object. 



548. SKELETON LARVA (Corethra plumicornis). A 

 common aquatic larva, remarkably transparent, fully de- 

 scribed in several natural-history journals. Should have a 

 place in every cabinet. 



549. LARVA OF GNAT (Culex pipiens, &c.). May be 

 found in every water-butt, and, if carefully mounted, is ' a 

 thing of beauty.' 



550. FOOT OF CUCKOO-SPIT (Aphrophora spumarid). 

 This common hopper, with its frothy home, is well known; 

 and both the foot and under wing are recommended as 

 microscopical objects. 



551. CLAW OF BRITTLE STAR (Ophiocoma rosula). The 

 anns of the common Brittle Star have attached on the 

 under side numerous two-toothed hooks, which, with the 

 ray spines, are good objects. (PI. X., fig. 25.) 



552. ROSY FEATHER STAR (Comatula rosacea). Either 

 the young animal, or the arms of a larger one, of this 



