PLATE XVII. 

 Spurilla brasiliana MacFarland. 



Figs. 90 and 91. Outline sketches of preserved specimen from 

 left and right sides. The dorso-lateral cereta have all 

 been removed, the outline of their bases showing their 

 relative position. The mouth region and reproductive 

 openings are partly everted and much distorted, and 

 the rhinophores are strongly contracted, x 5. 



Figs. 92 and 93. Inner surfaces of left and right mandibles, a., 

 superior margin ; b., inferior margin ; c., posterior tip of 

 masticatory process ; d ., fulcrum, or hinge, with single 

 crest in left mandible; e., the same, with double crest 

 in right mandible, x 16. 



