412 NOTES ON A COLLECTION OF SILURIAN FOSSILS — AMI. 



3. Tentaculites Canadensis, n. sp. Shell minute, elon- 

 gate, very gradually tapering. Annulations thread-like and 

 numerous, there being seventeen in the space of Jive millimetres. 

 Intermediate spaces marked by very fine transverse lines, of 

 which there are from six to seven present between two annula- 

 tions. Diameter of tube at greater extremity : 0.5 mm. Inas- 

 much as the specimen examined has its apex and portion of 

 the initial portion of the tube broken oft', it cannot be ascer- 

 tained whether this portion of the shell was annulated or 

 smooth. 



BRACHIOPODA. 



4. DisciNA Nova-Scotica, n. sp. (Form A.) Shell broadly 

 elliptical or sub-circular in outline. Dorsal or free valve very 

 convex. Slope of the shell from the apex to tlie anterior ex- 

 tremity of this valve, regularly and evenly convex, whilst the 

 slope on the posterior side of the apex, excentric, incurved, 

 pointing posteriorly, and situated at about one-sixth the length 

 from the posterior margin. 



Surface of the dorsal valve, black and shining — marked by 

 numerous concentric lines or rounded wrinkles of growth which 

 are crossed by more delicate and very numerous thread-like 

 lines, radiating from the apex to the outer margin. These 

 radiating lines are obsolete or well-nigh so on the apex. Lower 

 or attached valve, unknown. 



Dimensions of the dorsal valve of one specimen as follows : — 

 Length: 10 millimetres ; Breadth: 7^ millimetres ; Height oi 

 apex above lower value : 3i millimetres. 



5. DisciNA Fletcheri, n. sp. Shell almost circular in 

 outline, the diameter but slightly elongated in one di- 

 rection. Dorsal or free valve very moderately elevated. 

 Slope of the shell from the apex to the anterior margin, broadly 

 and evenly rounded, whilst the slope from the apex to the pos- 

 terior extremity is gently concave. 



Apex excentric, situated about one-fifth the length from the 

 posterior margin and pointing towards the posterior extremity 

 of the shell. Surface marked by numerous lamellar lines of 



