482 



cobb: further notes on tricoma 





m 



f 



Fig. 1. Female 



of Tricoma si mi- 

 lls, n. sp. 



a, mouth opening 

 and pharynx; 



b, reconstructed 

 cephalic seta; 



c, nerve ring; 



d, esophagus; 

 /, eye-spot; 



g, intestine; 



j, annule of the 

 cuticle ; 



k, blind end of ova- 

 ry; 



the worms are hairy thru- 

 out. The mouth cavity is 

 very small, prismoid and 

 unarmed. Three obscure 

 lips occur. Neither the 

 Jamaican species, T. major, 

 nor the Larat species, T. 

 similis, appear to possess 

 the cephalic alae observed 

 in T. cincta. Otherwise the 

 head on all three species 

 has practically the same 

 form, namely, approximate- 



:\ 



Z, location of the ly that of a quadrangular, 





vulva; 

 m, nucleus of egg; 

 n, anus; 

 o, one of the three 



caudal glands; 



j>, spinneret. 



blunt, truncated pyramid, 

 with two edges of the pyra- 

 mid ventrally submedian 

 and the other two dorsally 

 submedian. The four cor- 

 ners of the base of the 

 pyramid project slightly and to them are 

 attached the four cephalic setae. No labial 

 papillae have been seen. There is some 

 uncertainty about the function of the two 

 pigmented submedian bodies behind the 

 base of the neck. Their form, number and 

 position somewhat favor the supposition 

 that they are eye-spots, but if so they are 

 farther back than in any species of nema- 

 tode known to me. No lateral organs have 

 been seen. There occurs uniformly in three 

 specimens of T. similis an organ of con- 

 siderable size in the body cavity on the 

 ventral side just behind the oesophagus. 

 It seems probable that this is the ventral gland and that it 

 has a smaller companion cell in its rear, after the manner of 

 the ventral gland in Spilophora, Chro?nadora and related genera. 



2 60 



