140 AN UNDESCRIBED LARVA FROM MAMMOTH CAVE. 



integument behind the head. 11. The absence of evident 

 segmentation on the greater part of the body. 



EXPLANATION OF THE FIGURES. 



PLATE I. 



A. Head and anterior part of body of larva. 



B. Oblique view of dorsal side of head, showing plates and sutures. 



C. Posterior end of body, showing anal appendages. 



PLATE II. 



D. Larva greatly enlarged, with internal organs represented as 

 seen through the transparent body wall. 



E. Ventral side of head, with parts outlined, a, labrum; b, "la- 

 bium." 



PLATE III. 



F. Transection through anterior part of ocelli, and through man- 

 dibles, a, mandible; b, mouth; c, frontal ganglion; d, ocellus. 



G. Section through middle of an ocellus. 



H. Transection through segment next the head, a, cerebral gan- 

 glia; b, posterior end of subcesophageal ganglia; c, cesophagus; d, 

 salivary ducts ; /, lateral fold of body-wall. 



