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6B). The estimated surface area of the olfactory epithelium, including that present on the lateral walls of the nasal chamber (Figs. 1B and 2L), is ?140 mm2. The volume of the nasal chamber is 51 mm3. The estimated depth of the sensory channels (Fig. 1B, inset) is 65�C130 ��m. Transverse cross-sectional areas increase markedly in the nasal chamber (Fig. 6A); the increase correlates with an anterior-to-posterior expansion in the width of the nasal chamber (Fig. 3A and B). The maximum transverse cross-sectional area of the nasal passageway is found toward the rear of the nasal chamber (Fig. 6A). As noted by Theisen http://www.selleckchem.com/products/Gefitinib.html ( 1976; see also Braun and Northcutt, 1998, Fig. 32.4B), the anterior edge of the central lamella projects from the lamellar array (Fig. 2K). Furthermore, the anterodorsal edge of this lamella extends into the junction between the nasal duct and the nasal chamber (ADE, Fig. 2D�CF and Fig. 3D), terminating just anterior to the dorsal spur. But the most prominent feature of the central lamella, visible even to the naked eye, is a large protrusion situated on its anteroventral edge (P, Figs. 2F and http://www.selleckchem.com/products/DAPT-GSI-IX.html L, 3D, 4, and 5; see also Fig. 1C). The protrusion, which has a triangular frontal aspect (Fig. 5A) and appears spade-like in transverse and horizontal cross-sections (Fig. 2F and L), spans the three central lamellae (Fig. 5A) and partially obstructs the incipient nasopharyngeal duct (Fig. 2, main image, and Fig. 3D). Although Theisen (1976) refers to the protrusion as two ventral ��extensions�� of the central lamella, http://en.wikipedia.org/wiki/NK_cells in the present specimen this feature is a single, discrete protrusion from the anterior edge of the central lamella. The protrusion is either missing in Myxine (Theisen, 1973, Fig. 1), or much reduced (Theisen, 1976). Reynolds numbers throughout the nasal passageway are low (