TRILOB1TES. 303 



me to be proper to the East Indies and the coast of America. The gpecies 

 found in France L. cyclops is commonly called the Casserole *, from its 

 having some resemblance to the form of that utensil, and because when the 

 feet are removed its shell is used to hold water. Savages employ the stylet of 

 the tail to point their arrows, which, thus armed, are much dreaded. Their 

 eggs are eaten in China. When these animals walk, their feet are not seen. 

 Fossil specimens are found in certain strata of a moderate antiquity. 



FAMILY II. 



SIPHONOSTOMA. 



THE Siphonostomse have no kind of jaws whatever. A sucker or siphon, 

 sometimes external and in the form of an acute inarticulated rostrum, and at 

 others concealed or but slightly visible, fulfils the functions of a mouth. There 

 are never more than fourteen feet. The shell is very thin, and composed of a 

 single piece. They are all parasitical. 



This)family is now divided into two tribes, theCALAGiDEs, comprising Argula 

 and Caligvs (or the Fish- Louse), and the LEBNEIFORMES, which consists of 

 two genera also. They are Dichelestium and 



NlCOTHOE. 



These animals terminate the Crustacea, and are distinguished from all 

 others of that class by their heteroclitical form. To the naked eye they seem 

 nothing more than two lobes united in the form of a horse-shoe, which encloses 

 two others. By the aid of glasses, however, we discover that the two large 

 lobes are formed by the great expansion of the sides of the thorax, which 

 resemble wings, are almost oval, and thrown behind ; that the two others are 

 clusters of eggs, &c. 



Nicothoe astaci, Aud. and Edw. The only species known; it is about half 

 a line long and three lines broad, the thoracic enlargement included. It is 

 rose-coloured, paler on the oviferous sacs; the expansions yellowish. It 

 adheres closely to the branchiae of the Lobster, and penetrates deeply between, 

 the filaments of those organs. 



TRILOBITES. 



ACCORDING to Brongniart and various other naturalists, it is in the- 

 vicinity of the Limuli and other Entomostraca with numerous feet, 



* The King-crab of our fishermen,' or the Horse-shoe. Very common on the coast of 

 New Jersev. 



