Little- kno'wn Victorian Fossils. 115- 



Caryocaris curvilatus, Gurley, Journal of Geology, vol. iv.,. 

 No. 1, 1896, p. 87, pi. iv., fig. 3; pi. v., fig. 3. 



Specific characters. — Carapace thin, or even filmy, winglike in. 

 appearance, sub-elliptical, well-rounded ventrally, dorsal and 

 ventral margins with deep fokls, excepting on the extren)e edge. 

 A few oblique wrinkles crossing the ventral folds both ways in 

 the posterior ventral region, which possibly mean a strong 

 original inflation of that part of the carapace. Vestiges of 

 cliitinous thoracic or cephalic appendages sometimes preserved at 

 the anterior extremity of the carapace ; this end is distinctly 

 blunt in general form in well-preserved specimens, thus differing 

 from that of Lingulocaris. Occasionally the two valves are found 

 united (see Fig. 17). Posterior extremity of carapace occasionally 

 showing a rninute tuberculation near the hinge line. Telson 

 short, sharply pointed, and with a laterally attached and oblique 

 stylet. Masticatory apparatus consisting of a maxillary ridge or 

 base, with about eight sharp cusps, the highest being in the 

 middle. 



Measure/nenis. — Extreme length of longest specimen figured, 40 

 mm. Greatest lieiglit of same specimen, 11 mm. Average 

 length of carapace without appendage.s, 30 mm. 



Observations. — In the lower Ordovician slates and shales of 

 Victoria certain Phyllocarida occur, often in great abundance. 

 The largest and commonest of these forms was referred by Sir F. . 

 McCoy to the genus Hymenocaris, and he gave the provisional 

 or MS. name of H. salteri to the species in 1861.' Since that 

 time, although often referred to by the above-mentioned name, it 

 had not been systematically described until 1892, when Mr. 

 Etheridge, jun. {(>p. supra cit.), gave a very complete account of 

 the form, so far as specimens were available, with full references 

 to past records; and figures were also given of some of these 

 Victorian fossils. Etheridge then referred the form to the genus 

 Lingulocaris on account of its general shape ; the affinity to 

 Caryocari-s, in which genus Salter had previously suggested it 

 should be included,^ being considered slight, since it difi'ered in 

 its general outline. The specific name maccoyi was then substi- 



1 The ancient and recent Natural History of Victoria. Vict. Intercol. Exhib. Essays, . 

 p. 162. 



2 Quart. Journ. Geol. Soc, vol. xix., 1863, p. 139, note. 



