CRYPTONYMUS. 169 



Fig. 38. 



Jsaphus {Crypt.) Kowalewskii, Lower Silurian. Pulkowka, Russia. (From Lawrow.) 



AsAPHUs (Cryptonymus) scutalts, Salter. PI. XXV, figs. 2 and 3. 



IsoTELUS L.fflviCEPS, Portl. Geol. Report, p. 299, t. ix, fig. A (not of Balman, Paleadae., 



t. iv, fig. 1), 1843. 

 AsAPHUS (IsoT.) LiBViCEPS? Salter, in Morris's Catal., 2Dd edition, p. 100, including 



wrongly /. mtermedius, Portl. ; see I. gigas, 1854. 



— (Crypton.) l5;viceps ? lb., in Decade xi, Geol. Survey, under the descrip- 



tion of A. gigas, sec. 3, p. 4, 1864. 



— scuTALis, Salter, in the Catalogue of Fossils in the Mus. P. Geology, p. 5, 



1864. 



A. {Crypt. ?) modicus, triuncis, late ovatus, convexus, caudd obtusd, capite subangulato. 

 Caput caudd longius {long. 1^ unc, lot. 2 uncias), angulis obtusis. Glabella non lobata, 

 IcBvissima, in medio capite constricta, et sulcis axalibus pone oculosprofimdis convergentibus, 

 ante minime profundis et divergentibus. Ocidi ex medio capite prominentes, propiores. 

 SuturcB faciales postica valde arcuatce, pane angulum aftingentes. Thorax axe lato con- 

 vexo, pleuris brevibus. Cauda semicirculata fere ; axe conico prominente sub cortice annu- 

 lato, per § caudce extenso. Latera caudce lavia, sulco superno solum disfincto. 



The Asaphus laviceps of Caiman's Palaeadae, T. lY, fig. 1, thoiigli in some general 

 characters like this species, is quite another thing really, and is a species of the subgenus 

 Symphymrus rather than of Cryptonymus or Isofelus, as Professor Burmeister pointed out. 

 It is near to A. palpebrosus, Dalm., and Portlock himself pointed out some of the 

 difierences from his species, 



/. intermedins of the last-named author, which he says he only separated provisionally 

 from /. IcBviceps, is a crushed specimen of the A. gigas. Portlock seems not to have 

 been clear about this form, for he has labelled the specimen here figured (fig. 3) as 

 Isotelus intermedius, whereas the axis of the tail is well marked out, and the ribs visible. 



I have figured the true /. intermedius of Portlock with ours at the top of the plate, 

 that the difi"erence in the eyes, thorax, &c., may be apparent. Our species is a marked 

 one, and I am glad to have the opportunity of clearing it up. It has long been in the 

 Mus. P. Geology as A. scutalis (MS.). 

 22 



