a carnivorous Tipulid larva. 251 
this paper, some from my own preparations, others from 
living larve. Mr. Hammond has also revised most of 
my statements, correcting errors, and adding further 
particulars. The account of the pericardium and dorsal 
vessel is mainly taken from his notes. Mr. Norman 
Walker, Assistant in the Biological Department of the 
Yorkshire College, has been most zealous in procuring 
specimens and cutting microscopic sections. 
EXPLANATION OF Puates X., XI., XII. & XIII. 
(Figs. 1—81 relate to the larva.) 
PLATE X. 
Fic. 1.—Larva of Dicranota, ventral aspect, x 8. The nume- 
rals indicate the numbers of the body segments, exclusive of the 
head. 
Fic. 2.—Head, dorsal view. at, antenna; oc, eye-spot; s, median 
chitinous septum; mn, mandible; map, maxillary palp; lbr, 
labrum. x 50. 
Fic. 8.—Head, ventral view. sm, submentum; mf, mentum ; 
pr, prothoracic integument enclosing the posterior half of the head ; 
or, cephalo-thoraciec orifice occupying the posterior ventral surface 
of the head. x 50. 
Fic. 4.—Mandible, x 150. 
Fic. 5.—Maxillary palp, x 150. 
Fic. 6.—Setz from external cuticle, x 200. 
Fia. 7.—A pseudopod, with the terminal circles of hooks, x 50. 
7a. Detached hooks, one from each circle, x 800. 
Fic. 8. Head retracted, x 50. 
Fic. 9.—Twelfth segment, dorsal view, showing the spiracles, 
x 26. 
Fic. 10.—Twelfth segment, ventral view, showing the branchial 
appendages, x 25. 
Fic. 11.—Alimentary canal. ws, cesophagus ; sg, salivary gland 
st, stomach ; Mp, Malpighian tubules; 7, intestine 
