MORPHOLOGY OF THE LEPIDOPTEEA. 183 



Figs. 54 rt to 54 A-. Transverse sections tlirougli the vesicles and azygos oviduct of a caterpillar about the 



middle of the quiescent suspended stage, corresponding to fig. 31, Pi. XVII. 

 54 a. Transverse section, the sixth of the scries, tlirougli the azygos oviduct. A small amount of 



intrusive fatty tissue intervenes between it and the hypodermis, h. 

 54 b. The ninth section of the series, corresponding to the posterior limit of the anterior portion of 



the azygos oviduct. The folds are just in contact veutrally. 

 54 c. The eleventh section of the series ; Zi.c, the lumen of the bursa copulatrix ; od! , the lumen 



of the middle section of the azygos oviduct, still open ventrally. 

 54 d. The eighteenth section of the series, taken between the bursa copulatrix and the receptaeulum 



seminis, but nearer the latter. The lumina of the anterior vesicle and the middle region of 



the azygos oviduct, od! , are indistinguishable. 

 54 e. The apex only of the twenty-second section of the series, taken through the base of the 



receptaeulum seminis, r.s, od! , the lumen of the azygos oviduct, which in shape resembles 



fig. 54 <^. It becomes gradually diminished in height and increased in width in the following 



sections. 

 54/. The twenty-ninth section of the series, towards the posterior limit of the hind region of the 



azygos oviduct, where its height is least. 

 54 g. The thirty -second section of the series, through the anterior edge of the posterior vesicle. 



The narrower upper part above the dotted line appears to correspond with m, fig. 53 d, and to 



form a portion of the sebaceous apparatus, (jL od!, the azygos oviduct open below, 

 54 /;. The thirty-fourth section of the series. The dorsal or sebaceous portion, yl., of the vesicle is 



more constricted basally. od! , the azygos oviduct open below. 

 54?'. The thirty-fifth section of the series. The sebaceous portion, _j//., of the vesicle is distinctly 



divisible into a right and left half, with a median furrow, od!, the azygos oviduct as before. 



m, mesoblast cells. 



54 A-. The thirty-sixth section of the series. The sebaceous portion of the vesicle is divided into 



two tubes, gl., a right and a left. The tubes are traceable through the three following sections 

 and the basal or oviducal region, od!, through one more in addition. 

 Figs. 55 a to 55 i. Transverse sections similar to the above from a caterpillar just about to pupate. The 

 larval cuticle was split in the dorsal thoracic region. The j)arts evidently resemble very 

 closely in anatomical character fig. 38, PI. XA^II., but are smaller. 



55 a. The sixth section of the series, b.c, lumen of the bursa copulatrix ; od! , the azygos oviduct; 



h, the hypodermis of the body. 

 55 b. The eighth section of the series. The lumina of the bursa, b.c, and of the azygos oviduct, 



od!, are continuous ; /;, the hypodermis of the body-wall. 

 55 c. The tenth section of the series. ?-.*., the lumen at the base of the receptaeulum seminis, just 



open to the lumen of the azygos oviduct, od! The hypodermis, h, and very delicate pupal 



cuticle, cu., are shown. 

 55 d. The eleventh section of the series. ?•.*., the base of the receptaeulum just separated ofl" from 



the azygos oviduct, od.' Between it and the oviduct the obliquely cut ends of some cells of the 



vesicle. The azygos oviduct opens below by a small pore into which the cuticle, cu., is 



prolonged. The pore is the bursal aperture. 

 55 e. The thirteenth section of the series, r.s., the receptaeulum cut across, od! , the posterior 



region of the azygos oviduct completely closed in below by union of tlic edges of the iurrow 



seen in fig. 54/. It is still in continuity with the hypodermis, h, of tlic body-wall, cu., the 



pupal cuticle. 

 55/ The sixteenth section of the series, just at the commencement of the sebaceous apparatus, yl. 



The azygos oviduct, od!, opens to the exterior by a second pore, the posterior or oviducal 

 SECOND SERIES. — ZOOLOGY, VOL. V. 28 



