190 DE. C. T. TEECHMA]S"X OS" [vol. Ixxiii, 



irregular growth-ripples, especially toAvards the beaks, but is other- 

 wise smooth. Anterior margin nearly straight, lower margin gentl}^ 

 rounded, and hinder margin below the hinge-line rounded. 



An adult shell is 49 mm. long, 36 mm. high, and the two valves 

 are 24 mm. thick. 



A young specimen is shorter relatively to the height than the 

 -adult, measuring 18 mm. in length and 15 mm. in height. 



Locality and horizon. — Nugget Point, in a loose block 

 washed out of Carnic beds in the cliif- section. I collected four or 

 live specimens. 



Remarks. — It is with considerable reserve that I refer this 

 edentulous shell to the Palseoconch genus Cardiomorplia. The 

 shape of the young shell, however, suggests this genus. The gape 

 below the beak apparently precludes it from belonging to the group 

 of Anodontopliora ; while the laminar structure of the shell and 

 the byssal gape suggest that it may be a Myalinid. 



Paljeoxeilo otamitexsis, sp. nov. (PL XXI, fig. 21.) 



The shell is rather thick ; anteriorly the valves are somewhat 

 strongly inflated, but they tend to flatten out posteriorly. The 

 beaks are rather prominent, anteriorh^ situated, and directed 

 forwards. The margin is well rounded in front, gently curved 

 below, and is produced, narrowing gradually behind. There is 

 Tio trace of a posterior ridge on the shell, the surface of which is 

 genth" rounded and smooth. The concentric growth-lines are fine, 

 evenly spaced, and ver}^ regular. When the hinge-line is scraped 

 away, a row of many teeth is seen behind the beak, with about 

 ■six much larger teeth in front of it. Length = 17 mm. ; height = 

 9 mm. ; depth of right valve = 3 mm. 



Locality and horizon. — Bed c, Otamita. Carnic. I col- 

 lected several specimens with the shell on them. 



Remarks. — The comparatively-smooth surface of this shell 

 suggests that of P. elliptica Goldfuss, from St. Cassian ; but the 

 beaks are more anterior, and the shell more inflated beneath them. 



Pal^ois'eilo cf. PR.EACUTA Klipstciu. (PI. XXI, fig. 22.) 



1895. A. Bittner, ' Lamellibrancliiaten der Alpineu Trias ' p. 143 & pi. xvi, figs. 

 32-35. 



The shell is fairly thick, the beaks situated well forward. The 

 anterior margin is well rounded, the lower margin gently curved ; 

 the posterior portion of the shell is produced, and tapers rather 

 rapidly. The anterior portion of the valves is considerably inflated, 

 but they flatten out posteriorly. An appreciable blunt ridge passes 

 from behind the beaks to the lower posterior margin. The con- 

 centric growth-ridges are well marked and fairly regular ; a few of 

 the furrows between them are wider than the rest. Length = 

 18 mm. ; height =10 mm. 



Locality and horizon. — Bed c, Otamita (Hokonui Hills). 

 Carnic. I collected two or three fine specimens with the shell on 

 them. 



