TABLE 1. Measurements in mm of NFL 2074, referred specimen of Numataphocoena yamashitai: skull. Dimensions follow Fordyce et al. (2002). Measurements are rounded to the nearest 0.5 mm. For skull and mandible, distances are either horizontal or vertical. * shows a measurement, which is only of the left side (the measurement points to the median line).
| Skull | NFL 2074 | NFL 7 |
| total length, from the most anterior point to posterior of occipital condyles | 260.0+ | 199.0+ |
| length of rostrum | 111.5+ | - |
| width of rostrum at the base | 43.5* | - |
| cranial length | 142.5+ | 199.0+ |
| width of premaxillae at a line across posterior limits of antorbital notches | 44.0* | - |
| maximum width of premaxillae about the level with mid-orbit | 25.0* | 56.0+ |
| postorbital width, across apices of postorbital processes | 85.5* | - |
| maximum width across narial aperture | 19.5* | - |
