BARNACLES 253 



the other that do fall upon the land do perish and come to no- 

 thing." He then describes in detail the various transformations, 

 arid ends with : " But what our eies have seen and hands have 

 touched we shall declare." 



The long, flexible stalk of Lepas is its anterior end. Generally 

 this stalk is only half an inch long, but in some species it attains 

 the length of a foot. 



Huxley describes the barnacle as a crustacean fixed by its head 

 and kicking food into its mouth with its legs. The mouth has a 

 pair of small mandibles and two pairs of maxillae, the last pair 

 uniting to form a lower lip. The thorax has six pairs of branched 

 appendages. The body is enveloped in a fold of skin, to which 

 are attached five shell-like plates. One of these plates is long 

 and narrow, and extends along the dorsal side ; two are large and 

 triangular (the terga) ; two are small and triangular {the scuta), 

 the long point extending downward. These shells are on the 

 free or posterior end. 



Barnacles have a nervous system, consisting of a brain and a 

 chain of five or more ganglia, but no special respiratory or circu- 

 latory organs are known ; the cirripeds, or feet, are supposed to 

 perform these functions. They have also a food-canal, a diges- 

 tive gland, and excretory tubes. The eggs are carried under the 

 external fold of the skin in flat cakes. 



L. anatifera. The shell is bluish-white, showing lines of growth 

 and faint radiating lines emanating from the anterior basal angle. The 

 upper valves are narrow; the long tips point downward, and the top is 

 blunted, leaving a space which is occupied only by a membrane. Near 

 the apex of the shell, at the back, is a distinct angle. The dorsal valve 

 is broad, not much compressed, and is sometimes grooved lengthwise. 

 The cartilage of the shell and the stalk adjoining the shell are orange- 

 colored. The stalk is grayish-brown and the cirri flesh-colored. 

 The stalk is from one inch to six inches long. The shell is one inch 

 long. 



L. striata. Shells bluish-white ; valves sharply triangular ; dorsal 

 valve compressed, forming a ridge ; lines radiate from the basal angle of 

 the lower valves and from the upper angle of the terminal valves, start- 

 ing from the extreme end ; the margins have a narrow edge of yellow 

 cartilage ; the stalk and cirri are of a dark slate-color ; shell and stalk 

 are each about an inch long. 



L. pectinata. Shell shorter and less compressed than in the preced- 

 ing species ; lines of growth and radiating lines distinct ; a decided line 



