Table 2. Measurements of left half of nasal structure.

Species	ID	Head length (cm)	Distance from naris to choanae (cm)	Diameter of center of nasopharyngeal duct (cm)	Volume of intermediate region (cm3)	Volume of olfactory region (cm3)
Hawksbill	H-1	16.8	5.0	0.71	0.93	0.44
	H-2	11.8	3.8	0.57	0.46	0.16
Olive ridley	O-1	12.8	4.3	0.62	0.71	0.38
	O-2	13.4	4.9	0.59	0.73	0.28
	O-3	13.1	4.9	0.69	1.34	0.43
Black	B-1	16.4	5.7	0.70	1.14	0.65
	B-2	9.2	2.9	0.47	0.29	0.11
	B-3	9.3	2.9	0.41	0.28	0.11
Green	Cm-1†	13.8	4.1	0.41	0.34	0.15
	Cm-2‡	18.0	5.8	0.66	0.93	0.37
Loggerhead	Cc-1‡	20.3	6.7	0.83	ND	ND
	Cc-2‡	20.8	6.1	0.67	ND	ND
Leatherback	Dc-1‡	18.6	4.5	1.07	ND	ND
	Dc-2‡	21.3	4.3	1.33	3.78	1.47
	Dc-3‡	20.1	4.2	1.18	ND	ND

ND, Not determined.

^†An individual reported in [10].

^‡Individuals reported in [13].