FREE-LIVING NEMATODES 



489 



26 (27) Lateral dots much accentuated Spilophoni HjLsiian. 



The striae arc rcs^jlvah'e into ruw< ..f dots 



which are much accentuated on the latir.il lu-lds. 



/' \ _ ' Genus of a score or more known siKxics, 



aquatic, mostly marine. 



Representative species. 



Spilophora canadensis Cobb 19 14. 



Cs .5. . . .8. . . i '5 -MM U4 



(^ 2. 4.3/ ■■ . ij i.- • •■\yi ■> '■* 



Lateral wings (j) are very prominent, and pos- 

 teriorly are somewhat scalariform. The females 

 have symmetrically reflcxed ovaries. 



Habitat: Fresh-water ptjiids, Cape Breton Is- 

 land, Dominion of Canada. 



Fig. 786. Spilophora canadensis. 



a, mouth opening; b, dorsal tooth; c. pharj-nx; d. 

 base of the pharynx; e, esophuKus; f, nerve celL»; t, 

 nerve-ring; //, excretory imre; /, valvular api«ratu<i 

 of the bulb; j, longitudinal row of cuticular markings 

 characteristic of the genus; k, intestine; /, rencttc cell; 

 m, nucleus of renette cell; n, cell access<jrv to the 

 t » ti X300 renette cell; o, blind end of testicle; p, reversed of the 



striationsof thecuticula; (/, vas deferens; r, spiculum; i, 

 anus; /, caudal gland; u, spinneret, (.\fter Cobb.) 



Striae composed of dots; the lateral ones Httle if any accentuated. 28 

 Pharynx without esophageal bulb Cyatholaimus ^iisiv^n. 



PharjMix is cup shaped then conoid, and 

 longitudinally ribbed. 



Genus of a score or more of aquatic 

 species, nearly all marine but found also 

 in brackish and fresh waters. Cyatho- 

 laimi are found in all trojiical and tem- 

 perate seas, and the individuals are nu- 

 merous. In most habitats lx)th sexes 

 will be found. Diatoms are sttmetimcs 

 found in the intestine. Thoush not 

 shown in the species here figured, the re- 

 nette seems always present, and is often 

 well developed. 



27 (26) 



28 (29) 



Representative species. 

 Cyatholaimus truncatus Cobb 1914. 





i- 



Habitat: Silver Springs, Fla. 



Fig. 787. Cyatholaimus trumatui. 

 I, side view of a female; II. side view of 

 head; III, front view of the same head; 



IV, ventral view of anal region of male; 



V, lateral view of the siime; VI. lateral view 

 in tl>e middle of tiie body showing cuticular 

 markings and pores. 



a, suhmedian cephalic seta ; h. lal>ial 

 papilla; c, amphid; d, dorsal to<nh: <■, lat- 

 eral cephalic seta; /, one of the twelve ribs 

 of the vcstihulc; .?, small sul)nie«lian phar;k-n- 

 goal tooth; //, base of the pliar>nx; i. ejac- 

 ulatory duct; j. intestine; k. one of the 

 four male pre-anal supplementary orRan.*; 

 /, one of the spicula; m, anal muscles; ». one 

 of the accessor>- pieces; o, ner\c ring; p. 

 one of the cells of the intestine; q. lumen oA 

 the intestine; r, anus; s, blind end of re- 

 flexed ovar\-; /, egg; u. vulv.i; r. llexurr 

 in anterior ovan.'; w, junction <>l tlir .ivarv- 

 and uterus; J. pores in the cutKiila: y cme 

 of the three caudal glands; :. male gland (i). 

 (After Cobb.) 



