SECOND DIVISION. MOLLUSCOUS ANIMALS. 
In addition to the extensive and interesting class of animals which we have 
just reviewed, the oceans, lakes, and rivers swarm with other forms of life, 
of almost infinitely-varied characteristics, some exhibiting aspects of remarka- 
ble beauty, while others are extraordinary for their grotesque ugliness; yet 
it will be seen that all are beautifully adapted, by their organizations and 
attributes, to the order of being where the Creator has placed them. 
Cuvier divides the Mollusea into six classes, as follows : — 
The Crrnatorops, whose body has the form of a sac, enclosing the 
branchiw, and open above, whence protrudes the head well developed, and 
crowned with certain strong, fleshy, elongated productions, by means of which 
the animals progress and seize upon objects. The Cuttle-fish is a represen- 
tative of this class. 
The Prrrorops. —In these the body is not open, and the head has no 
appendages, or if any, they are very minute, locomotion being effected by 
two wines, or membranous fins, placed on the sides of the neck, and in 
which the branchial tissue is often spread. 
The GasrEeropops, which crawl on the belly, on a fleshy disk, sometimes 
compressed into a fin. Nearly all of them have a distinct head. 
The AcEpHaLes. — These have the mouth concealed in the base of the 
cloak, which also encloses the branchiw and the viscera, and opens either 
throughout its whole length, or at both its extremities, or at one only. 
The Bracntorops. — This class comprehends the species which, en- 
closed also in a cloak, and without an apparent head, have fleshy or mem- 
branous arms, garnished with cilie of the same nature. 
The Cirrnoprops. — This class comprises those mollusks which have the 
attributes of the preceding classes, but differ from them in having numerous 
horny articulated members, and in a nervous system more allied to that of 
the Annulose animals. 
They all have a soft body, which is covered by a flexible skin (the so- 
called mantle), under or over which calcareous or horny shells are formed 
by secretion. The chief organs are symmetrical and in pairs, generally 
disposed in a curve, so that the mouth is proximate to the opposite extremity 
of the intestinal canal. The blood is white, flows from the heart’ to all 
NO. XVII. 81 (221) 
