Page:Report of the Second Norwegian Arctic Expedition in the "Fram," 1898-1902 (volume 4).djvu/260

 189571901 No 33.] UPPER DEVONIAN lt'lSII REMAINS, 35

These assuntptiuns 0t PANDER are mainly at historir interest as tar as we are concerned. Allb‘l‘TltAUUAlR’a investigations. whit-,h have been carried further lvy my own prnot's oi the structure of the skeleton, it hm been considered t-ertain that Psmmnostens. Drepcmaspis aurl le’aspis are uearl related tortm. Drvpamtspis, the dermal skeleton of which is‘ known in most details, >l10llltl therefore provith us in the main with a representation of the appearance of Psammoslnus as well

In this rmtnectinn. however. it is of great interest to note that the Psmmnosteus remains iii the East Provinces ol Ru'

according tn

Fig.8. Sketch showing ttrr structure of the dermal skrletnuutPsttmmostousImman- Ih'imts A.“ We set» the dermal skelvtun vttt through in hut rtirrrtim Al ur- top, the llatlL-m-d dentit-Im “in. n u

line, narrow pulp t-m‘ihns tutti lint- dentin tutmtrs; twin“- llwse the vascular rrrmrt system

PANDEIt’s theory lit-long In one species. which would in that ruse receive the name 1’s. mueandrinus AG.

A.Sm'rn-Wuomvmnv itt his tratnlogtte‘ names. Amtsslz‘a species withnut giving his reasons tor ~n doing.

In reality a fresh investigation is retptired, - particularly at the nticroscopir structure 7 in order tn deride this tptestimt.

l’ersunallv l have only had a ten Psammoslens remaim from the Baltir Provinres ltn- rotnpariaun, viz, a spine .shapml element train the

‘ Catalogue nf the Fussil Fishes in lhl‘ Britiih Mint-tun, ll, 18%”, page till;