SUB GEN US ANATONCHUS 



(S. s.473) 171 



42. M. japonicus, n. sp. The head is not set off in any marked fashion. Am- 

 phids present in the form of elliptical markings nearly opposite the apex of the 

 single dorsal tooth ; the length of their long 2.1 e.9 30. >67* 98. 



axes, which are placed transversely on the 274 271 279 27? 2~* l ' 2 ma 

 head, is probably about one-sixth as great as that of the diameter of the head. The 

 capacious pharynx is somewhat deeper than the head is wide; the anterior portion 

 has a diameter more than half as great as that of the corresponding portion of the 

 head, while the posterior portion has a diameter about two-fifths as great as that 

 of the base of the head. The single, highly refractive dorsal tooth has its apex 

 somewhat in front of the middle of the pharynx. The rasps consist of 5 to 6 rows 

 of teeth, forming a group whose width is about one-fifth as great as the depth of 

 the pharynx. The wall of the pharynx is strongly developed, and is very finely 

 transversely striated in the posterior part. The lining of the oesophagus is an 

 exceedingly distinct feature throughout its length, and appears to occupy about 

 one-fourth of the optical longitudinal section. There is a small cardia. Intestine, 

 about 8 cells in girth, very obscurely tessellated. The short, blunt, arcuate conoid 

 tail is truncated at the terminus, which has a diameter about one-fourth as great as 

 that of the base. The lateral fields are about one-third as wide as the body, and 

 are composed of 2 rows of cells containing relatively large nuclei. 



This species rather closely resembles a number of others, and it is by no means 

 certain that it is not identical with some one of them, perhaps consituting a variety. 

 Curiously enough, it was found in Mississippi Bay, Yokohama, Japan. Sublimate 

 to balsam. 



43. M. tridentatus de Man. At the base of the pharynx are 2 minute denticles. 

 Amphids unknown. Pharynx more or less triquetrous, with three well developed, 

 2. 6.5 22. '62' 26 



2.1 

 2. 



2.6 

 6.5 



3. 



22. 



3.1 



3.2 mm 



2.7 



2.1 2.6 3. 3.1 2. 

 double, longitudinal ribs reaching from 

 end to end. (Esophagus at first slightly 

 swollen. Intestine distinctly tessellated. 

 The arcuate tail is conoid to the termi- 

 nus, which is about one-sixth as wide as 

 the base of the tail. Each of the slen- 

 der, arcuate spicula is cephalated by 

 contraction and is supplied throughout 

 its length with a median stiffening piece, 

 and is crossed near its distal extremity 

 on the outside by one of the rather 

 broad, two-pointed accessory pieces, 

 which are one-half as long as the spic- 

 ula. Supplementary organs 15 to 17, 

 apparently conical, 2 to 3 times as far 

 apart anteriorly as posteriorly, where they are nearly contiguous. The posterior 

 member of the series, the whole of which is about one and one-half times as long 

 as the tail, is somewhat smaller than the other members, and is located a short 

 distance in front of the anus. On the tail itself are a number of papilhe, dorsal as 

 well as ventral ; 2 pairs on the anterior half, ventral, and 2 pairs on the posterior 

 half, dorsal. It remains uncertain whether there is a spinneret and caudal glands. 

 This striking species seems to be widespread in Europe in moist soil, and i 

 rath-er common. Fig. 55 (after de Man). 



