278 



ZOOLOGY. 



In Lerneonema radiata Steenstrup and Ltltken (Fig. 234), 

 we find the lowest term in the series of degradational forms 



of this order. The 

 niouth-parts are here 

 converted into five 

 roots, radiating from 

 the head ; the body 

 is not segmented, and 

 ends in two long egg- 

 masses. 



In Penella (Fig. 

 236) the body is cord- 

 like, buried in the 



Fig. 232. Intestine and testis (f) of a copepod 

 (Pleuroma), side view. <%, oesophagus ; v, stomach ; 

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

 tine; e, heart ; vd, coiled vas deferens. After Clans, 

 from Gegenbaur. 



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 Lerncea branchia- 

 Us Linn, of the gills of 

 the cod, the body ia 

 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 with eggs. 



In Adheres, w| as- 

 cend a step higrrer in 

 the perfection of or- 

 gans ; the creature is 

 attached by a pair of 



, . Y ., . . - . .- 



jaWS Wnicn unite to narum of Mammoth Cave, much Fish- louse ot 



form a sucker, the an- enlarged ' tSSSSgfr 



tennae are present, though rudimentary, while ~ AfterVerrllL 

 the abdomen is faintly segmented. A. Carpenter i Packard 

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



Cantfwcamptw caver- Pig. 234.- 



