tl2 ANTICOMA: A GENUS OF FREE-LIVING MARINE NEMATODES, 



and a somewhat wider ampulla througli a ventral porus situated 

 half way between the mouth and the pectoral hairs (i.e. at 8%). 

 The lateral fields are one-third as wide as the body; the median 

 fields are much narrower. The tail is convex-conoid to near the 

 middle, where it is one-fourth to one-fifth as wide as at the 

 anus ; thence it narrows gradually to the ellipsoidal and slightly 

 swollen terminus, which gives exit to the secretions of the caudal 

 glands, — in other words the tail is almost exactly like that of 

 Anticoma typica. The slightly projecting vulva is accompanied 

 by four unicellular glands, of which two lie in front of it and two 

 behind it. One to three rather thick-shelled eggs, two-thirds as 

 wide as the body and about twice as long as wide, are usually to 

 be found in the uteri. The ovaries reach one-half to two-thirds, 

 the way back to the vulva. Next the uteri, the developing ova, 

 of which there are often twenty in each ovary, lie in single file, 

 but farther back (especially near the blind extremities) they are 

 arranged in several parallel rows. 



■ ^21 ^28 's ^ — ^1 ^'^ "™" The tail of the male is much like that 

 of the female. The remarks concerning the anal glands of 

 Anticoma typica apply also to this. The testicles also are 

 arranged much as in A. typica, and all the remarks made on the 

 histology of these organs in the description of that species may be 

 understood to be repeated here. The spicula are arcuate through- 

 out, though less distinctly so near the middle, and are twice as long 

 as the anal diameter. Unless carefully examined they appear to 

 be of nearly uniform size throughout. In reality they are much 

 larger in the proximal part. The proximse are not cephalated. 

 The enveloping accessory pieces are inconspicuous. Oblique 

 copulatory muscles occur in the region occupied by the organs of 

 copulation. The ventral supplementary organ is situated a little 

 in front of the spicula and is about one fourth as long as these 

 latter. Opposite the spicula occur four pairs of equidistant 

 submedian hairs, and considerably behind the anus occur two 

 pairs of hairs also submedian. ' 



Synonyms : A. limalis, Bast., A. pellucida, Bast., A. tyrrhenica, 

 De Man. 



