EUPHOBERIA FEROX. 171 



compose his Catamites communis. Of course, if Geinitz is right in his correlation of the 

 fruit, Ettingshausen himself would eliminate it from the synonyms ; but even apart from 

 this, it seems to me that the delicate stem made up of a large series of very small 

 vascular ridges with intervening cellular structures, and the form of the persistent leaves 

 sufficiently separate them from what we know as the ordinary type of Calamite in this 

 country as to make a good generic distinction, and to justify Lindley and Hutton in their 

 placing them in a distinct genus. Their name {Hippurites), however, indicates a false 

 affinity, and must be set aside for Sternberg's Equisetites, unnecessarily altered by 

 Schimper into Equisetides. Probably the " thin-walled Calamopitus," figured by Prof. 

 Williamson in his recent memoir on " Calamites " (' Phil. Trans.,' 1871, pi. xxv, figs. 19, 

 20), belongs to this plant ; and the Calamitean strobilus which he has so well worked out 

 in the ' Memoirs of the Literary and Philosophical Society of Manchester,' vol. iv, p. 248, 

 may be the fruit. 



" EURYPTERUS." {EUPHOBERIA) FEROX ."— Salter. 



Eurypterus ? (Arthropleura) ferox, Salter. Quart. Journ. Geol. Soc, 1863, vol. xix, 



p. 86, woodcut, fig. 8. 



Caterpillar ?, J. O. Westwood, in Brodie's Fossil Iusects in the Secondary Rocks of England, 



1845, p. xvii, p. 1 15, pi. i, fig. 1 1 . 



Accompanying Mr. Salter's description of Eurypterus {Arthropleura !) mammatus x is 

 a notice of another form named by him Eurypterus ? {Arthropleura) ferox. The specimen 

 described forms Fig. 54, 8, of the Woodcut reproduced at p. 164 from Mr. Salter's paper, 

 and was obtained by Mr. Charles Ketley (of Smethwick) from the Clay-ironstone 

 nodules in the shale over the " Thick Coal " of the Coal-measures, Tipton, Staffordshire, 

 associated with abundance of fossil plants. 



Mr. Salter observes, " At first sight it would strike an entomologist as a fossil Cater- 

 pillar of the Saturnia genus, so strong is its resemblance in size, form, and ornament to the 

 larvae of that group. Unlike most Crustaceans from the old rocks, it is extravagantly orna- 

 mented with long forked spines." Such spines are found on the carapace of Lithodes, and 

 also on the segments of the abdomen of the " Murray River Cray-fish," Potamobius astacus. 



Mr. Salter considers von Meyer's Arthropleura armata (already referred to) to belong 

 to Eurypterus (see Woodcut, Fig. 55, p. 166), and thinks it possible to assign both hisiT. 

 mammatus and E. ferox to the same group. 



In a ' History of Fossil Insects of the Secondary Rocks of England,' by the Rev. 

 P. B. Brodie, M.A., F.G.S., 8vo, published in 1845, some specimens are figured from 

 the collection of the Rev. F. W. Hope, 2 now preserved in the Oxford Museum. 



1 'Quart. Journ. Geol. Soc.,' vol. xix, p. 86. See also Woodcut, Fig. 54, 8, p. 164. 



2 The Founder of the Hope Professorship of Zoology in the University of Oxford, so ably filled by 

 Prof. J. 0. Westwood, M.A., F.L.S., the eminent Entomologist and Carcinologist. 



