cole 
opened ai their apices. From the apiees the inner eurfaces curve towatd each other 
and there is then a slight recurvature,eo that somewhat in front of the middle it 
would almost appear as if they could not be brought into contact. Everywhere the ine 
terior surface of the mandible is plain; there is no appearance of irregularity such 
ae would indicate the presence of denticlese or ridges, or any other sort of saree 
geal armature. foward the back, nauely opposite the base of the lerger anterior por- 
tion of the pharyngeal capaule conteining the mandibles, at the point where in this 
- view the mauntibies-—sentt come together, and at what niet perhaps be called the hinge, 
there is @ slight inerease in volune of the sutinized matter comprising uh 
to that in thie repiongthe;dorsomventrel width of the labial structures 16 somewhat 
greater than At is & little farther front, yet not 60 wade ae it is som ligtle rt B- 
gute. en 
 Sanee behind ‘the apices of the mandible . So sige in this view, regarding the gaand ib les 
as expressing @ mouth ‘opening euch ae thet of a fish or ligerd, the expreesion ; is some~ 
what that of a rather stupid erin. | 
FRONT VIEW. Taree © little behind the tps of the mendibles, the optical 
eroge-section of the mand it les together with the dorso-ventral expansion ete a six 7 
pointed star, 1 the upper and lower pointe of which are a Little woaker than the other 
four, and exhibit less color. This is the apiieal | section which shows the outeide 
mandibular groove or rvalley' at ite nost pronounced part, that ie to say @ conaider~ 
able distance in front of the gubmedian papillae. Thie view Like the dorac-ventral, 
‘chews the mandibles to close together feirly well, although they are not exactly in con- 
tact throughout their length. 
AMPHIDS. By careful focussing it is possible in any of the three views, but es- 
pecially the front view, to eee the amphidial openings. They are . little over one 
micron across, and lie between the front parts of the relatively large cephalic pap- 
illae. They are seen more distinctly in front view than in any other, and may be 
there followed inward and backward until a sensilla is reaches which is about one- 
eighth ae wide as the corresponding portion of the head, nearly circular in contour 
and résolves eo as to show about eight to ten elements. There are no eyespote. 

