specimens are very robust, and the head measures one fifth of the total length. Like in L. elvensis, the parietals measure less than half of the frontals. The frontals are three times as long as they are wide. It possessed slightly tumid, but styliform marginal teeth. The inner teeth were large and obtuse, but there pedicles were only moderately high. The species lacked any signs of ring-vertebrae. The fin-fulcra were large, but on the medial fins they were slender. The specimens assigned to it are P. 6839, P. 6899, P. 6900, P. 7412, and P. 7413, from the Oxfordian of England. L. occidentalis L. occidentalis is known from five ovular scales, described by Joseph Leidy in 1860. The enamel surfacing of all five scales is shiny and smooth. The largest of the scales is long, and the smallest in . L. haydeni L. haydeni is a species known from a single, rectangular scale, described by Leidy in 1860. The scale is long and wide. The covering of the scale is small, rectangular squares. The root of the scale projects toward the front of one of the long sides. The specific name honors Dr. Hayden, who discovered many remains, including the only scale of L. haydeni. L. latifrons L. latifrons was named and described by Arthur Smith Woodward in 1893. It is known from bones and scales from the head and trunk regions. It measured to about long. The scales of this species are large and smooth. There are no traces of rings on the vertebrae. The marginal teeth are slender and styliform. The portion of the dentary that bears teeth is deepened near the symphysis. It is known from a few, mostly complete specimens, P. 6841, P. 6838, and P. 6840. The specimens date to the Oxfordian of Huntingdonshire. References Semionotiformes Prehistoric ray-finned fish genera Jurassic fish of North America Jurassic fish of Europe Early Cretaceous fish of South America Early Cretaceous fish of Europe Late Cretaceous fish of Africa Cretaceous Brazil Fossils of Brazil Crato Formation Romualdo Formation Cenomanian genus extinctions Toarcian genus first appearances Fossil taxa described in 1832 Taxa named by Louis Agassiz