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My apologies if this has already been mentioned...
Sues, H.-D., Reisz, R.R., Hinic, S., and Raath, M.A. (2004). On the skull
of _Massospondylus carinatus_ Owen, 1854 (Dinosauria: Sauropodomorpha) from
the Elliot and Clarens formations (Lower Jurassic) of South Africa. Annals
of Carnegie Museum. 73(4): 239-257.
ABSTRACT: This paper presents a comprehensive description of the cranial
structure of the sauropodomorph dinosaur _Massospondylus carinatus_, based
oil four well-preserved skulls (including one of a juvenile individual) from
the Lower Jurassic Elliot and Clarens formations of South Africa.
_Massospondylus_ can be distinguished from other basal sauropodomorph
dinosaurs by the following combination of primitive and derived cranial
character-states: The greatest transverse width of the skull exceeds its
dorsoventral height by at least 10 percent. Even in adult specimens, the
orbit is proportionately large and the antorbital region proportionately
short. The maxilla has a tall, nearly vertical dorsal process, and its
medial sheet is narrow anteroposteriorly. A long posterior process of the
prefrontal extends along the dorsal margin of the orbit, but the frontal
still participates significantly in the formation of the orbital margin.
There is a distinct ridge on the dorsolateral aspect of the lacrimal and a
knob on the lateral surface of the prefrontal. A partial skull from the
Lower Jurassic Kayenta Formation of Arizona previously attributed to
_Massospondylus_ differs from the South African material in several cranial
and dental features and is not referable to this taxon.