CRUSTACEA. 
212 
all these organ's are filiform and have no forceps. Some of them at 
least as well as the last six and equally simple ones of the Stomapoda 
provided Avith claws, have an appendage or lateral branch. The 
seven last segments of the body, containing a large portion of the 
heart and furnishing a base for the attachment of the respiratory or- 
gans, can no longer in this respect be assimilated to that portion of the 
body AA'hich is called the tail in the Decapoda : it is a true abdomen. 
Its peniiltimate segment has a tin on each side formed like the caucial 
of the Macroiira, hut is frequently, as well as the last segment or 
intermediate portion, armed with spines or teeth. 
The Stomapoda are all marine Crustacea. I'heir favourite habita- 
tion is in the intertropical latitudes, and they arc not found beyond the 
temperate zones. Of tlieir hafnts we are totally ignorant ; that those 
which are furnished Avith cIraa’s use them in seizing their prey, in the 
manner of those Orthoi)tera called in Provence Pregadious or Man- 
tes*, Avc cannot doubt. Hence their Audgar appellation of Sea- 
Mantis: they are the Crangones and Crangines of the Greeks. 
According to Risso they prefer sandy l)ottoms in deep AA-ater, and 
copulate in the spring. Other Stomajjoda, tliose of our second family. 
l)eing less favoured Avith natatory appendages, and having a much 
flatter and more superficially extended body, are generally found on 
the surface of the Avater, Avhere they move very sloAvly. Wc Avill 
divide the Stomapoda into tAA'o families. 
FAMILY L 
CNIPELTATA. 
In this family the shell consists of a single shield, of an elongated 
quadrilateral form, usua.lly Avidened and free behind, coAmring the 
head, the antennse and eyes excepted, Avhich are placed on a common 
anterior articulation, and at least the first segments of the body. Its 
anterior extremity terminates in a point, or is preceded by a small 
plate Avith a similar end. All the foot-jaAVS, the second of Avhich are 
A'ery large, and the four anterior feet are closely approximated to the 
mouth on tAvo inferiorly converging lines, and have the form of 
claAA's Avith a single finger or mobile and flexed hook. With the 
exception of the second feet, all these organs are furnished at their 
external origin AAUth a little pediculated vesicle. The other six feet, 
at the base of aa’Iiosc third segment is a lateral ajspendage, are linear, 
terminated by a brush, and simply natatory. 'I'he lateral antennae 
* Some other analogou.s Orthoptera, such as tlie Phijllivm, resemble leaves. 'J’lie 
Phyllosoma?, Crustacea of the same order, exhibit similar athuities. 
