296 DR. J. MURIE ON THE ORGANIZATION OF THE CAAING WHALE. 
Fig. 27. The blow-hole of the White-beaked Bottlenose (Lagenorhynchus albirostris) 
opened by retroverting the lips. It shows the alar protuberances, smooth- 
surfaced posterior wall, and antero-lateral corrugated membrane. 4, anterior, 
and p, posterior lips; sp, septum narium; ¢, cartilaginous cushion, the arrow 
being directed into the maxillary pouch; 7, cuticular ridges of the spiracular 
cavity. 
Fig. 28. Diagram of the narial pouches and spout-hole of Globiceps. 
B, blow-hole; spe, spiracular cavity; p, premaxillary sac; m, maxillary, and nf, naso- 
frontal sacs. 
Fig. 29. Sketch of the right orbito-auricular region of the male L. albirostris, showing 
a dissection of the ear-muscles &c. 
ac, auditory canal; Ret, retrahens aurem; Afr, attrahens; Afl, attollens; Te, tem- 
poralis ; fav x std, facial vessels, nerve, and Steno’s duct. 
Fig. 30. An underview of portion of the left mandible and pterygo-maxillary region 
of the same Lagenorhynchus. Dissected to show the vascular rete inter- 
vening between the lower jaw and basis cranii, and its relation to the 
pterygoid muscles &c. 
Mn, mandible; z, zygomatic bar; Jpt, internal pterygoideus ; Hpt, external pterygoid, 
severed; ete, of the basis cranii and mandible; dma, internal maxillary artery ; 
id, inferior dental artery; @, artery, and v, vein, pterygo-maxillary branches ; pam, 
postnarial muscle. 
Fig. 31. Segment of the base of the skull of the Caaing Whale, which displays from 
below the tympanic region, the Eustachian tube, its enlargement, and the 
extensive rete mirabile covering its membranous walls and the adjoining 
depressions. 
c, left condyle; Boc, basioccipital; Hoc, exoccipital; ty, tympanic bulla; ma, malar; 
z,zygoma; pt, pterygoid; P.na, posterior nares; ac, auditory canal; Hus, Eustachian 
tube partially opened; Rete, basicranial plexus; vp, venous plexus; ¢f, condyloid 
foramen; fn, facial nerve ; she, stylohyal cartilage. 
PLATE XXXIITI. 
Fig. 32. Portion of cesophagus, the compound stomach, and part of the duodenum of 
the Pilot Whale. All more or less opened to show their internal walls and 
connecting passages. Their relative positions are necessarily displaced, to 
exhibit interior structure. 
@, esophagus; gl, esophageal gland; J, J*, IZ, IJ, dé IV, the four separate gastric 
cavities or stomachs; nos. 1, 2, 3, 4, 5, 6, lie over the pointers which indicate the 
several passages from the cesophagus to the commencement of the small intestine; 
