18 ART. 7. — S. TANAKA I 



Teeth confluent ; four or five rods in each anterior lamina, 

 sinuate, showing a columnar structure. Lateral rods behind 

 the anterior lamina low, oblique, their tips directed towards the 

 median part. Mandibular laminse included within the upper 

 laminœ ; they have the margin incised by three deej) clefts, one 

 median and two lateral, leaving four rounded cusps, of which the 

 submedian pair are smaller and more acute. The columnar 

 structure of the mandibular laminse is not so evident as in those 

 of the upper jaw and is traceable only in the above-named 

 cusps. A long low lamina containing visible white enamel rods 

 runs backwards from behind each of the outer cusps. Peritoneum 

 lining the body cavity unpigmented. 



Below the eye the sensory canal system gives off two branches, 

 the upper of which passes backwards toward the gill opening, 

 the lower extending forwards below eye as in Chimcera jordani. 

 From the intersection of a canal from the nape with the suborbital 

 canal, the lateral canal begins with a curve, the convexity of which 

 is turned downwards ; it thence proceeds posteriorly in nearly a 

 straight line, nearer back than belly, until a short distance behind 

 or vertically below dorsal notch, where it makes an abrupt bend 

 to the lower side of body and is thus continued into the filament. 



Color in formalin bhickish brown. Two rows of about nine 

 white roundish spots, which are of about half the diameter of eye ; 

 first to fifth spots lie above the suborbital and the lateral 

 canal ; sixth to ninth spots beneath the suborbital and the 

 lateral canal ; the first spot in front of eye ; the second behind 

 eye ; the third beneath dorsal spine ; the fourth below first 

 dorsal ; the fifth below anterior part of second dorsal ; the 

 sixth vertically above tip of ventral and directly beneath the 

 lateral canal ; the seventh beneath the intersection of suborbital 



