186 Fnuh'rn-h (%nj>,Han: 



Class BIlArHTOPODA. 



Fain. TKHEBUATl'LIDAE. 



Genus TEREBRATULINA. (rOrl)i^iiy. 



TkREBRATULIXA FLINDKKSI, sp. liov. (Plate XVUr., Fii;-. ."U'Nr). 



Description. — Shell small, elongate ovate, with tapering beak. 

 Both valves convex, the pedicle valve deeper tlian the l)rachial ; the 

 latter depressed towards the anterior margin. Beak stout, pro- 

 minent, with large foramen. 



Shell surface ornamented with about 12 strong, ridge-like costae, 

 bifurcated at or near the anterior margin, and beset with squamosa 

 scales; costae becoming spinose at lateral margins of shell. Inter- 

 costal spaces deep. Concentric lines of growth inconspicuous. 



Dimensions. — Lengtli, 4.75 mm.; greatest width, 3 nun.; thick- 

 ness, 2 mm. 



Ohstrrdfions. — This species is well repi-esented in the Dennant 

 Collection by specimens from Flinders, from the Mitchell Eivei-, and 

 fi-oiu the Muddy Creek older beds. 



T . findersi differs from T . fria/u/ulfiris. Tate,l in its more elon- 

 gate shape and ovate outline, and in tlie convexity of the bi-achial 

 valve. 



Occurrence. — Two specimens (one of whicli is the selected holo- 

 typeK found in Bore K). :]\i)-:V2i) feet. 



Fam. TF]?EB1{ATFLL1DAF. 



Cenus TEREBKATELLA. (1'()rl)igny. 



Tekebratrli.a acutii.'osti; \. sp. iio\. (Plate XV [JT., Fig. '.^yin-r). 



Dc.^cn ption . — Shell small, subci I'eular, compressed, with a pro- 

 minent l)eak. Pedicle valve lonve.x in the umbonal area, with 

 sli-jhtly concave shoulders, flattcMied posteriorly. Brneliial valve 

 nioie ile))ressed and only slightly i-ouvex in the ]iosterioi- region. 

 Surface nearly smooth, but under a low jMiwt'r st'en to lie finely, 

 rail i ally striate. 



/>;///^//^■/V>/^9.— Leno-tli. •2.2:5 nmi. ; l.readth, 1.84 nnii. : thickness. 

 .7.") mm. 



OlK-ierraf ions. — This s])ecies bears somi' resemblance to the evenly 

 contoured variations of T. iroothi. Tate, 2 l)ut is easily separated by 



1. Trans. Roy. Soc. S. A\ist., veil, iii., isso, i>. l.".'.t, i>I. viii., H-s. -,iiL n.id.. vol. \xiii., lsli!> 

 p. -Jf-J. 



". Op. siipia fit., vol. iii., ISSH, )>. Kit, jil. i\., ti-s. KV/,-. 



