ETCHEMINIAN FAUNA OF NEWFOUNDLAND. 191 



Platyceras transversum, n. sp. PI. I. figs. 4 a and b. 



This is one of a group of three species of small gasteropods, occa- 

 sionally met with at Smith Sound. They are found buried in the 

 calcareous mud of the upper limestone, and also within the tubes of 

 Hyolithes, etc., where they probably concealed themselves after the 

 death of the animals which formed those tubes. 



The surface of all those species is minutely granular, and in none 

 does the curve make a complete whorl, but the umbo projects too far 

 to allow the shell to be classed with PaUeacmsea or Parmophorella. 

 P. transversum is considerably larger than the other two, and is 

 distinguished by its fine, closely set growth lines. 



Platyceras radiatuji, n. sp. PI. I., figs. 5 a and b. 



This is proportionately a longer species with more projecting umbo. 

 [t is distinguished by about a dozen fine, narrow, sharp ribs on the 

 dorsum, radiating from the umbo. 



This differs from any described Cambrian or Ordovician species. 

 It approaches the genus Heliconopsis, Ulrich and Scofield ; but its 

 strongly curved back and projecting umbo separate it. 



Platyceras cymbula, n. sp. PL I., figs. 6 a and b. 



Distinguished from the preceding by its smooth surface, and from 

 the first by its sub-carinate dorsum, and less concave slopes in the 

 anterior region. 



LAMELLIBRANCH1ATA. 



Modiolopsis thecoides, n. sp. PL I., figs. 7, a to c. 



Only the right valve is known ; it is remarkable for its long, nar- 

 row shape and ear-like anterior end. When this is concealed, the 

 shell is easily mistaken for a Hyolithes, the form of the posterior end 

 and the sculpture of the surface, being like the dorsal side of a tube 

 of that genus. The shell is about 9 mm. long and 4 mm. wide. 



ANNELIDA. 



UROTHECA, n. gen. 



This genus based on chitinous tubes from the Etcheminian and 

 Cambrian is described in an article to be communicated to the Royal 

 Society of Canada, May 1899. 



