REPORT ON THE ANNELIDA. 
311 
median fissure. The limbs of the mandible are ankylosed at the point of junction 
Fig. 66. — Maxillae and dental plates of Nothria soiribreriana ; x S4 diameters. 
Fig. 67. — Mandibles of the same, from the ventral surface ; x 15 diameters. 
anteriorly, and shortly behind the curved pigment-band are separated by a considerable 
Fig. 68. Pig. 69. 
Pig. 68. — Left great dental plate (soft) of another example ; x 20 diameters. 
Fig. 69. — Dental margins of the mandibles exhibiting the ledge behind the crown ; x 54 diameters. 
interval. There is a deposit of dark brown pigment in the anterior part of the shafts, 
chiefly noticeable on the ventral surface. 
