ON TWO NEW SPECIES OF CHIM^KA. 5 



clasping organ armed with five spinous denticles on the inner 

 side. 



Teeth confluent ; five or six rods in each anterior lamina of 

 the upper jaw ; the margin of the lamina sinuate and slightly 

 convex ; lateral rods behind the anterior lamina low, oblique, 

 their tips directed towards the median part. Mandibular laminae 

 included within the upper laminse ; rods in the laminae rather 

 indistinct, margin of lamina with two concavities and more or less 

 indistinctly sinuate. Peritoneum lining the body cavity unpigment- 

 ed ; wall of digestive canal of a dusky color. 



Lateral canal of the sensory canal system straight almost 



Lateral view of the head of a C'Idmœm, explaining nomenclature of the sensory 

 canal system adopted. (After Mr. Collinge's nomenclature.) Ju., Jugular branch ; 

 L. C, Lateral canal; Mx. Mn., Maxillo-mandibular branch; Mx., Maxillary division of 

 the maxillo-mandibular; Mn. Mandibular division of the maxillo-maudibular; S. or., 

 Suborbital branch. 



without any sinuation. It shows an interesting feature in the sub- 

 orbital part. From the suborbital branch of the canal system 



