On a supposed Phyllocarid from the Older Palaeozoic of Tasmania

Abstract

Carapace (right valve), obovate, with a ventral-prolonga. tion (probably somewhat distorted by pressure); with a rounded anterior and prolonged posterior extremity. Dorsal edge gently convex towards the ilnterior, more Strongly so in the posterior region. Ventral border concave near the abdominal arch, becoming convex and distally obscurely extended in the middle region, and meeting the concave margin anteriorly. Surface of carapace wrinkled with three or more undulatory folds, crossing obliquely from the upper anterior towards the lower posterior margin. Surface marked with coarse areolation. Dorsal margin crenulate to undulose, a character probably caused by the compression of the chitinous and inflated carapace.