ONCHIUM, DORYLLTUM 



303 



XII. 



83. Onchium ocellatum n. sp. 



Order Axonchia 



.27 7.2 19. Y? 52 t 



1.8 1.2' " " Cuticle thin, the 

 transverse striae almost impossible of resolution. Except for the cephalic setae, 

 the cuticle is naked. Spear hollow, brownish, very thin-walled. Though the 

 yellowish, solid, refractive eye-spots are sublateral in position, they are rather 

 near together. The specimens thus far examined do not enable one to make a 

 clear distinction between the oesophagus and the intestine. Connected with 

 the posterior part of the oesoph- set (ph (4-l\^ QMph ^&_ 

 agus are large glandular cells, (^^C\ // A 



probably three in number, judg- "\vv^H% 



ing by the number of nuclei. These w aHHm \VW m 



structures seem to be homologous 

 with those found in a similar posi- ^ 

 tion in Tylenchus and Aphelen- 

 chus, but their actual connection 

 with the lumen of the oesophagus * 750 



is problematical, as no connecting duct has been seen. The fl(X 

 best interpretation seems to be to consider these structures 

 as a part of the oesophagus, but it is entirely possible that ^ p 

 the oesophagus ends just in front of these glands. The thick- 

 walled intestine, which has a very distinct, refractive zig- ,, 

 zag lumen, becomes almost at once three-fourths as wide as 

 the body. From the elevated anus, the prominent, cutinized , /a 

 rectum extends inward a distance equal to the anal body- > 

 diameter. The cells of the intestine contain numerous some- 

 what variable yellowish granules, the largest of which are OCt /W. 

 one-sixteenth as wide as the body. The conoid tail is arcuate. 



Caudal glands have not been clearly deciphered, but they ff/ 



probably lie behind the anus in the anterior half of the tail 



in a loose tandem. They are narrow and elongated. The (fa[ rffl 



elongated, granular renette cell, twice as long as the body 



is wide, and about one-third as wide as long, is located // ,./ 



six to eight body-widths behind the neck. The single, 



reflexed sexual organ extends forward; the accompanying 



formula, correct for the larvae, does not pretend to indi- lMlnt.. 



cate the true form of the developed organ. Males unknown. 



Habitat: Clean "white" marine sand, in five feet of water, x 500 

 from a cove near the entrance to Buzzard's Bay, Mass., U. S. A., Also from 

 "sea-grass," Key West, Florida. Fig. 83. 



84. Doryllium uniforme n. sp. Cuticle naked, very minutely transversely stri- 

 ated. Neck conoid. Spear minute, dorylaimoid, but with a distinct, somewhat 

 refractive posterior swollen part. The oesophagus continues with slight vari- 

 ations until it joins the pineapple-shaped cardiac bulb, which is two-thirds as 

 wide as the base of the neck and is separated from the preceding portion of the 

 oesophageal tube by a constriction. This bulb contains, among other things, 

 a spherical nucleus with a distinct nucleolus, presumably indicating the exis- 

 tence here of glands like those of Dorylaimus. The narrow intestine joins the 

 middle of the posterior surface of the bulb, and becomes at once about two-fifths 



