368 Dr. R. H. Traquair on Palceozoic Fishes. 



ward of the entrance to Chesapeake Bay, 1685 fath. {Dall) ; 

 Gulf of Manaar, Ceylon, 738 fath. {^Investigator'). 



Tliis is another remarkable instance of wide distribution 

 among deep-water moUusks — another link in the chain of 

 proof (if that were needed) regarding the cosmopolitan cha- 

 racter of the deep-sea fauna. 



The soft parts of this species have been examined and 

 described by Mr. W. H. Dall, and are remarkable in several 

 respects. 



The shells from the Gulf of Manaar have the acute tubercles 

 somewhat larger and less numerous than in the ^ Challenger ' 

 shells or Mr. Dall's specimen, which he liberally placed in 

 the British Museum collection. 



lu other respects they agree. The width and character of 

 the umbilicus, the general form, colour, and texture are 

 similar, and the number and relative proximity of the ribs on 

 the lower half of the body-Avhorl also correspond, the ridge 

 bordering the umbilicus being more crenulated than the rest. 



On account of the extra size of the nodules on the two upper 

 ridges the aperture exhibits two corresponding conspicuous 

 rows of indentations, a feature but feebly developed in the 

 more finely tuberculated forms. 



I have followed Wood-Mason and Alcock in placing this 

 shell in Solariella, as it agrees conchologically more closely 

 with that group than with Margarita. It is, however, pro- 

 bable that the characters of the soft parts are sufficiently 

 distinctive to warrant the formation of a new genus. 



XLV. — Notes on Palceozoic Fishes. — No. I. 

 By R. H. Tbaquaik, M.D., LL.D., F.R.S. 



[Plate IX.] 



DEVONIAN. 



DiplacantMdse. 



Paeexus. 



In the Powrie Collection, now in the Edinburgh Museum, 

 there is a spine belonging to this genus, from the Old Red 

 Sandstone of Cradley, Herefordsliire. It is 2| inches in 

 length, slender, tapering, gently curved, and showing, along 

 the concave side, one of the two rows of denticles, with 

 distally directed apices, characteristic of the genus. The 



