260 



Lin^ula Rodriguezii, Bathhun, sp. nov. 



Dorsal valve ratlier large, elongate, and oblong in outline. Front very sligbtly 

 rounded, but curving somewbat strongly to meet tbe lateral margins, wbicb, 

 curving but sligbtly, extend backwards nearly parallel witli one anotber for 

 about tbree-fourtbs tbe lengtb of tbe valve. Tbe posterior lateral margins 

 incline towards one anotber at an angle of about 100 degrees, and tbe beak is 

 apparently a little rounded. Tbe outline of tbe valve is very defective, but I 

 bave been able, I tbink, to trace it out very satisfactorily from tbe ratber 

 numerous lines of growtb, wbicb are quite well preserved on tbe front ; but 

 tbe valve is so crusbed tbat it is impossible to determine its convexity. 



Tbe impressions of tbe several muscular markings are more or less perfectly 

 preserved. Tbey sbow tbat tbe valve is dorsal. Tbe impression of tbe pedicle 

 muscle is not preserved, but just in front of tbe place wbere it sbould be, are 

 two small cresceut-sbaped impressions, placed closely togetber and apparently 

 more deeply excavated in tbe substance of tbe test tban are tbe otber muscular 

 markings. Tbe markings left by tbe decussating muscles seem to be narrow^ 

 and elongate, but tbe outline is indistinct. Tbey are apparently situated at 

 tbe sides of a raised, circular disc, from tbe front of wbicb extends a sbort, 

 low and ratber broad median crest, but tlie test is so broken tbat tbe appear- 

 ance of a disc and crest may not be natural. On eacb side of tbis crest are tbe 

 impressions of tbe posterior adductors, wbicb seem to be unusually small, 

 Avbile tbe subelliptical impression of tbe anterior adductors in front of tbe 

 crest is also very small. One or two narrow, faint, curving depressions 

 extend forward from tbe front of tbe impressions of tbe decussating muscles, 

 and probably denote structure. Tbere is a V-sbaped line on tbe forward por- 

 tion of tbe disc, apparently of tbe same cbaracter. Lengtb 22 m. m., breadtli 

 13 m. m. 



Obtained from the yellow sliale underlying the sandstone at Erere. 



Dedicated to Dr. J. C. Eodrigues, Editor of the Novo Mnndo, 

 New York, one of the most prominent patrons of the Morgan 

 Expeditions of 1870 and '71. 



Although the fossils so far obtained from Erere, were collected 

 from so small an area and so limited a thickness of rock as to ren- 

 der it unsafe to draw any extended or definite conclusions from 

 them ; yet the Brachiopod fauna, such as it is, resembles so closely 

 that of the Hamilton group of New York State, as to leave no 

 doubt that the beds in which it was found, the sandstones and shales 

 of Erere, represent about the same horizon as the Hamilton group 

 of North America. Not only are characteristic Hamilton group 



