334 ORDER ANAXONCHIA 



113. Nudora lineata n. sp. Cuticle two to three times as thick at the head 

 end as elsewhere; more or less like that of Desmodora, but with longitudinal 

 striae somewhat like those of Monoposthia. The annules increase in width, 

 and are more accentuated, toward the head. Each of the ten longitudinal wings 

 appears to comprise a series of "V"-like markings on the anterior portion of 

 the body, which are reversed on the posterior. Following the serrate contour 

 of the head it is discovered that this reversal takes place not far behind the 

 neck. There seem to be twelve, subdistinct, more or less conoid, minute, blunt 

 labial elements. The labial papillae are more or less setose, one seta between 

 each pair of labial elements. Limits of the pharynx rendered very definite on 

 account of the elongated pharyngeal swelling. Anterior part of the pharynx 

 cyathiform, posterior triquetrous-tubular. Posterior part of the neck cylin- 



setqM4) J-l-l-W 13 ---:? 9 ?2l" >i. 7 6.. droid, anterior convex-co- 



lh\\ ; V\ktf*^^ "I/A '" noid. The amphids appear 



1 J-l _ 1-^t. _ _ _* y >: 48 to be oylindroid depressions 



E.2 2.9 3.2 3.4 r^Z.? , ,, ,. , 



about as deep as the cuticle 



is thick. In front of the wide annule bearing the amphids, 

 there is another about as wide as those on the neck, 

 which, however, does not thin out on its anterior edge, 

 X756 "^^strJongity spn as do the regular annules. Following this annule comes 

 the lip-region, which in contra-distinction takes a carmine stain. The elon- 

 gated, pharyngeal bulb, one-half as wide as the neck, is set off from the remainder 

 of the oesophagus by a constriction. The oesophagus is at first one-third, near 

 the nerve-ring one-third, preceding the cardiac bulb one-third, and finally five- 

 sixths, as wide as the corresponding portion of the neck. The cardiac bulb is 

 cylindroid and makes up one-third of the oesophagus. Its musculature is coarse 

 and colorless. The oesophageal tube expands suddenly to form the cardiac 

 bulb, which is divided into two main parts by a break in its musculature. There 

 are smaller breaks, also, near each end. The lining of the oesophagus appears 

 to occupy one-sixth of its width. The rather thin-walled, narrow intestine 

 becomes at once one-fifth as wide as the body. At the cardiac constriction the 

 intestine joins the center of the posterior surface of the oesophageal bulb. 

 Minute granules are scattered in the intestinal cells. The conoid tail, on which 

 there are obscure longitudinal striae, tapers from the anus to the non-striated, 

 simple, symmetrical spinneret. The broadly saccate caudal glands form a close 

 tandem in the anterior half of the tail. Slender caudal setae occur on the tail 

 end, both preanal and postanal, three to four ventrally submedian, and three to 

 four dorsally submedian. just in front of as well as behind the anus, about one 

 and one-half body-widths apart, and shorter on the male than on the female. 

 The rather broad ovary tapers near its blind end. The flattish ova are arranged 

 for the most part single file. The spicula are frail, very slender, mostly uniform, 

 but finally tapering and acute. Their proximal ends appear to lie about opposite 

 the body-axis. The yellow accessory pieces are somewhat longer than the 

 spicula. They are arcuate and stoutish, and their proximal ends appear to lie 

 somewhat dorsad from the body-axis. There are two obscure supplementary 

 organs, the anterior of which is located at a distance in front of the anus equal 

 to one and one-half body-diameters, the posterior being opposite the middle of 

 the spicula. These consist of slight elevations further accentuated by small 

 alterations in about three consecutive annules. 

 Habitat: Sand, below low tide mark, Hull, Massachusetts, U. S. A. Fig. 113. 



