540 AIE-BLADDEE IN NOTOPTEKUS BOENEENSTS. 



'Reference letters. 



a.h.c. Anterior diverticulum of the left branchial cavity. 

 ab.p. Abdominal portion of the air-bladder. 

 a.f. Auditory fontanelle. 

 als. Alisphenoid. 



a.p. Accessory articular process for the centrum of ihe first vertebra. 

 h.g. Basioccipital groove. 

 be. Basioccipital. 

 hr^, br-. First and second branchial arches. 

 c.f. Cranial fontanelle. 

 c.s. Entrance to bony cul-de-sac. 

 d.p. Ductus pneumaticus, 

 d.v. Dorsal vacuity. 

 d.w. Dorsal wall of the air-bladder. 

 e.o. Exoccipital. 

 e.p. Epiotic. 

 /. Frontal. 

 f.c. Filiform caeca. 



g. Lateral groove for the sensory canal of the bead. 

 h.s. Haemal spine. 

 l.a.c. Left auditory cjecum. 

 l.c.c. Left caudal cacum of the air-bladder. 

 l.p. The inpushed dorsal wall of the tubular portion of the bladder. 

 l.s. Longitudinal septum in the abdominal part of the bladder. 

 Is'. Longitudinal septum in the subspherical sac. 

 as. CEsophagus. 

 e.g. Oblique groove separating the subspherical sac from the abdominal 



part of the bladder. 

 op. Opisthotic. 

 p. Parietal. 

 pro. Prootic. 

 ps. Parasphenoid. 

 pt. Pterotic. 

 r.a.c. Aperture leading to right auditory csecnm. 

 r.e. Kadial or interspinous element of anal fin. 

 sh.s. Subspherical sac. 

 spo. Sphenotic. 

 so. Supraoceipital. 



tp. Tubular portion of the air-bladder. 

 ts. Transverse septum. 

 u.s.r. Utriculo-saccular recess in the basioccipital. 

 v'. First vertebra. 

 v.d. Ventral diverticulum. ; ' 



v.v. Ventral vacuity. 

 X. Foramen for the exit of the Vagus nerve. 



