278 



ZOOLOGY. 



Tig. 232.— Intestine and testis (0 of a copepod 

 (Pleuroma), eide view, a, oesophagus ; ??, stomacli ; 

 h, blind sac leading from the stomach ; i, intes- 

 tine; c, hearr ; vd, coiled vas deferens. — ^After Clans, 

 from Gegenbanr. 



In Lerneonema radiata Steenstrap and Ltltken (Pig. 234)^ 

 we find the lowest term in the series of degradational forms 



of this order. The 

 month-parts are here- 

 converted into five 

 roots, radiating from 

 the head ; the body 

 is not segmented, and. 

 ends in two long egg- 

 masses. 



In PeneUa (Fig. 

 236) the body is cord- 

 like, buried in the 

 flesh of the sun-fish or sword-fish, etc., the females having 

 two long, string-like 

 egg-sacs. The speci- 

 men figured was taken 

 from a sword-fish off 

 Portland, Maine. 



In LemcBci Iranchia- 

 lis Linn, of the gills of 

 the cod, the body is 

 thicker, the root-like 

 appendages grow deep 

 into the flesh of its 

 host, like twisted and 

 gnarled roots, while the 

 shapeless sac-like body 

 is filled wi Ui eggs. 



In Aether e^, we as- 

 cend a step higher in 

 the perfection of or- 

 gans ; the creature is 

 attached by a pair of 



„i,:„t, „„;4.„ J-., Fig. 233.— CSintt<wamp«tM «(H«r- Fig. 834 — 

 jaws Wnicn unite to nar«m of Mammoth Cave, much Pisb-lonse oi 



form a, sucker, the an- ^•^"=^ '^^'^^^ 



tennae are present, though rudimentary, while — -^^'erTemiL 

 the abdomen is faintly segmented. A. Carpenteri Packard 

 (Fig. 235) lives on the trout in Colorado. 



