278 



ZOOLOGY. 



Fig. 233. —Intestine and testis (^ of a copepod 

 (Pieuroma), side view ce, cesophagua ; v, stomacli ; 

 A, blind sac leadintr from the stomacii ; ^, intes- 

 tine; Cy hearf ; vd, coiled vas deferens. — After Glaus, 

 from Gegenbaur. 



In Lerneonema radiata Steenstnip and Lfltken (Fig. 234), 

 we find the lowest term in the series of degradational forms 



of this order. The 

 mouth-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 (Pig. 

 336) 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 Lemma hranchia- 

 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 with eggs. 



In Adheres, we as- 

 cend a step higher in 

 the perfection of or- 

 gans ; the creature is 

 attached by a pair of „ 



1 . V, -, , V\S- ^lSi.~CaKthocamptm caver- Fie. 234- 



laWS wnicn unite to noram of Mammoth Cave, much Fish - louse ol 

 i! „ „ „„„!,„„ +!,„„„ enlarged. the Menhaden, 



form a sucker, the an- " twice enlarged! 



tennae are present, though rudimentary, while --^"^f^*"''!- 

 the abdomen is faintly segmented. A. Carpenteri Packard 

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



