o,li 



ARriiRLironA 



The >[vsiPTP.i: arc wljoly disli-ilniicil, sc\-cral species of ^fvs:.^ U"',^'- oO('~l 

 oecurriuL; on our coa.sls ami one in ihe C'.reat Lal^es. In these ihe enilopotlile 

 of llie sixth alMlominal appendaLTC contains a otocyst, uith a calcic tluoriele 

 statolilli. Oilier famine; are the EuniiAUSiiLXK atul LenniocAS riuK.v: ol the 

 high seas. 



Fig. _5i!i. — Mvsls cl:.nii;ata ifroin CerstackcrV ,\. _3. first an.l s-coml aiitomia-", J, 

 expedite; an, eye; /, eadopoilite; o. otocyst; 1-7, abiloiniiial soiniles. 



Order II. Stomatopoda. 



In structure cif the cephalothorax these forms, known as mantis shrimps 

 (from a resemblance to the insect, the jiraying mantis), are Knver than the 

 srhizopods, since the last three or four thoracic somites are free and are not 

 CDVcred bv the caraiiace. The appendages, however, are more de\elo|ied, 

 since onlv the three posterior of the thoracic feet are biramous and natatory. 

 The four in front of these are prehensile and bear a jiincer formed of the last 

 two joints, the last being slender and usually toothed and closing in a grooxe of 

 the penult joint like a knife blade in the handle. The first of these raptorial 



Fio. 307. —Stjiiii/d iii,iiil!.<:. ,,l, ,}[', In-st and second aiileniue; /, si\lh abdominal feet; 

 k. L^ills; /), schizopodal thoracic feet; />r. fn-' , raptorial [cet ; l'\. pleopoda ; id, 

 telsoii. 



feet are the largest and are used in capturing fishes, etc. Since the thoracic feet 

 are of little serxice for locomotion, the abdomen is long and stout, especially the 

 caudal fin. The li\'e anterior abdominal feet bear the gills, and correspondingly 

 the elongate heart with many osti;\ extends into the abdomen. The transparent 

 pelagic lar\;e were formerly regarded :is aditUs and described ;is Miiiia and 

 Erirlillnis. .S\/;//7/(;,* (Imioilaclyliis:''' They are burrowing animals and deposit 

 their eggs in their holes. 



