562 
AV. F. PURCELL. 
dors. Dorsal side. ec. t. 8. Ectodermal tendon (entapophysis) of the 
anterior respiratory segment. ep. fd. Epigastric fold (along hinder 
margin of anterior respiratory segment), fd. Fold in doi'sal wall of 
tracheal ante-chamher, to the lateral part of which the muscle 11 (text- 
fig. 17) is attached. <). o. Opening of the genital duct into the epi- 
gastric fold. hy. Hypoderniis. I'. Median keel on ventral side of 
receptacnlum seminis. 1. p. Lateral pocket of trachea, lat. Lateral 
side. m. 1-37. Muscles (see numbered list in text). m. 38. Ob- 
liquely transverse muscle from the anterior sui-face of the entapo- 
physis. ec. t. 8 to the sides of the keel of the receptacnlum seminis. 
m. 39. Short muscle from the entochondrite t. 8 in a medio-ventral 
direction to posterior side of epigastric fold. m. 40. Median muscle 
from venti'al side of i-eceijtacnlum seminis to ventral integument of 
hodv. running along posterior ventral edge of the keel of the recep- 
tacnlnm. med. Medial side. med. tub. Medial hunch of four tubules 
at base of anterior trachea, nv. Nerve? p. c. Posterior compartment 
of lateral pocket of trachea. p>ed. Pedicel. post. Posterior side. 
pithii. (I. Pulmonary ante-chamber, r. .s. Receptacnlum seminis. rd. 
Sensory rods in trachea, sept. Septa (lamellae) of lung-book. sp'. 
Spiracle of anterior respiratory segment, sp". Spiracle of posterior 
respiratory segment, spi. Anastomosing spines, spi'. Points at which 
the tracheal spines are attached, .spm. Sperniatophors. t. 8. Ento- 
chondrite at posterior end of the segment of the ventral longitudinal 
muscle of first respiratory somite. thr. Transverse anastomosing 
threads Ijorne liy Uie ti-acheal spines, tr. a. Tracheal ante-chamber. 
tr. fd. Intertracheal fold along hinder margin of second respiratory 
segment, tab. Tracheal tubules, reat. Ventral side. 
All the figures, except fig. 9, were drawn with the aid of a drawing 
apparatus. Transverse and sagittal sections are so arranged that 
the horizontal plane of the body is parallel to the lower edge of the 
papei'. 
Fig. 1. — (Zeiss, objective C. ocular II, spirits.) Calculus bicolor, 
adult $ . Sagittal section through the entapophysis of the inilmonary 
segment. 
Fig. 2. — (Zeiss, C, II. spirits.) Median .section through the recep- 
taculum seminis and ejiigastric fold, from the same series as fig. 1. 
Fig. 3. — (Zeiss, C, II. warm Flemming's solution + alcohol.) Har- 
pactes Hombergi. ad. $ . Similar .section to fig. 2. 
Fig. 4.— (Zeiss. yV oil iminers., IV.) Caponia spiralifera. Internal 
chitinous threads of cephalotlioracic tracheal trunks. 
