FREE-LIVING NEMATODES U 



SPIRA, Bastian, 1865 13 



1. Spira septentrionalis, n. sp. The striae, invisible except near the head are 

 resolvable into rather irregular dots. The three lips are without papillae. The 

 i 7.4 10.6 Y 92.3 neck is cylindroid posteriorly, 



s ' i"g ' "2 is j 7' 1-4nm ' convex-conoid anteriorly. The 



amphids, seen thus far only in 



dorso-ventral view, have a central elevation, probably appear- 

 ing as a "fleck" in the surface view, and are about half as wide 

 as the corresponding diameter of the head. The oesophagus 

 is half as wide as the neck, and ends in a rather obscure bulb containing an in- 

 distinct valve, two-thirds as wide as itself. No distinct cardia was seen. The 

 intestine, separated from the oesophagus by a collum about half as wide as the 

 neck, becomes at once three-fourths as wide as the body; it is but a few cells in 

 girth, and the cells contain few or no granules. The rectum is conspicuous, the 

 posterior lip of the anus prominently elevated. From the anus the tail tapers 

 for two-thirds of its length, then becomes cylindroid to the swollen terminus, 

 which is one-fifth as wide as the base. The caudal glands were not clearly seen, 

 but are apparently arranged in a loose tandem in the anterior third of the tail! 

 The female reproductive organs are probably double and reflexed. 



Habitat; remarks. Cape Royds. Described from a single somewhat shrunken 

 specimen. 



ANTICOMA, Bastian, 1865 



2. Anticoma subsimilis, n. sp. The thin cuticle is almost invisibly striated. 

 On each lateral line there is a row of five somewhat curved cervical setae, 

 r ' 26 si 8 each having a length equal to one- 



r- ' '' :.. i.5mm. fourth the corresponding width 



of the neck. These two rows 



begin at a distance from the anterior end equal to nearly three 

 times the width of the head, and have a length equal to the corre- 

 sponding diameter of the neck. The cuticle becomes thicker at 

 the lips, which bear a circlet of six papillae. The oesophagus is cylindroid in 

 the anterior part, but becomes conoid posteriorly. The mobility of the lips is 

 proved by the nature of the ingested food. Seen dorso-ventrally the pharynx 

 appears more nearly cylindroid than when seen laterally. Seen laterally it 

 tapers so that finally it is one-fifth as wide as the corresponding part of the head. 

 The lining is rather thin, but refractive. The cardia, one-half as wide as the 

 neck, is conoid with a short cylindroid extension. The rather thick-walled in- 

 testine, separated from the oesophagus by a collum three-fifths as wide as the 

 neck, becomes at once three-fourths as wide as the body, and is about six cells 

 in girth. The intestinal cells contain numerous small, uniform, distinct granules. 

 The posterior lip of the anus is elevated. The caudal glands are packed together 



13 The abbreviations used in lettering the sketches, which represent the ante- 

 rior and posterior extremities respectively, are explained near the foot of page 9. 

 As a rule the information given in the sketches is not repeated elsewhere. As 

 far as possible the sketches are derived from typical specimens. 



