288 ORDER SYNODONTIA, ORDER SYNONCHIA 



where it bends inward and forms an elbowed lip, giving to the front of the head 

 an asymmetrical appearance; hence, the generic name. Neck cylindroid posteri- 

 orly, convex-conoid anteriorly. Amphids faint. At the base of the pharynx 

 there are three spherical collections of black, loosely-placed granules (ocelli?), 

 one collection dorsal and two submedian, the dorsal collection being the least 

 pronounced. The cylindroid oesophagus at the nerve-ring is one-third, and fi- 

 nally is one-half, as wide as the corresponding portion of the neck; it has an indis- 

 tinct lining, and a fine, colorless musculature. There is a more or less hemi- 

 spherical cardia, three-fifths as wide as the base of the neck. The thick-walled 

 intestine, which is set off by a constriction one-half as wide as the base of the 

 neck, becomes at once three-fourths as wide as the body. It has a faint lumen, 

 and its cross-section exhibits about four cells. In all parts of the intestine the 

 cell walls are rather distinct and optically give rise to a network 

 effect. From the more or less continuous anus the prominent, 

 cutinized rectum extends inward a distance three-fourths as great 

 as the anal body diameter. The rather numerous, more or less 

 yellowish granules contained in the cells of the intestine are of 

 Invariable size, the .largest being about one-thirty-fifth as wide as 

 the body. They are so arranged as to give rise to a more or 

 less distinct tessellation. The lateral fields are one-fourth 

 as wide as the body. The tail tapers from the anus, and is at first conoid, and 

 then convex-conoid in the posterior eighth. It is arcuate to the unarmed, more 

 or less symmetrical terminus. There is a conoid, symmetrical spinneret. In it 

 a compound ampulla is apparent. Renette unknown. The female sexual organs 

 are probably double and symmetrically placed. 



Habitat: Marine tap water, laboratory, Woods Hole, Mass., U. S. A. Flem- 

 ming to glycerine jelly. Fig. 70. 



VIII. Order Synonchia 



71. Tripylium carcinicolum (Baylis). Cuticle naked. Cephalic setae papil- 

 loid. Wall of the pharynx fairly thick and refractive, and curved inward on the 

 inner surface of each pair of lips so as to form three 120 biting organs, which 

 close together as shown in the illustration. Pharynx cylindroid. Neck cylin- 

 droid posteriorly, conoid anteriorly. Oesophagus cylindroid, its lining a trifle 

 stronger behind the pharynx for a distance equal to the length of the pharynx. 

 The anterior portion of the intestine is altered so as to produce the effect 

 of a pyriform bulb three-fourths as wide as the base of the neck, set off on 

 both sides by a constriction. At the nerve-ring, the oesophagus is two-thirds, 

 and finally three-fifths, as wide as the corresponding part of the neck. The lin- 

 ing of the oesophagus finds optical expression in three refractive lines, occupying 

 two-fifths of the width of the organ. There is no cardia. What appear to be 

 glandular cells occur opposite the cardiac constriction, two, one on each side, 

 each ellipsoidal and half as wide as the neck, finely granular and with a promi- 

 nent nucleus. The thick-walled intestine has a distinct, refractive, more or less 

 zig-zag lumen, and becomes at once three-fourths as wide as the body; in cross- 

 section it presents two cells. The cardiac collum is one-fourth as wide as the 

 neck. From the more or less continuous anus, the cutinized rectum extends a 

 distance equal to the length of the anal body diameter. Fine uniform granules 

 pack the cells of the intestine; there is a faint tessellated effect due to the refrac- 

 tive nature of the cell walls. From in front of the anus, the straight tail is first 



