9 



in a transverse section through the wall of the cup in this specimen, are 

 alternately larger and smaller. There is an appearance of what may be 

 tranverse diaphragms, but not sufficient to prove their actual presence. 



Owing to the imperfection of the specimen, the number of the septa has 

 not been ascertained, except in so far as they are indicated by the exter- 

 nal lon^ritudinal striaj. Assuming; that each one of these indicates a 

 single septum, then there would be about eighty septa, in the upper part 

 of a specimen of the size of that represented by fig. 3. In tlie upper 

 part there are four stride in the width of two lines, but in the lower part 

 there are five or six in the same space. 



Some of the young specimens, those about an inch in length, in the 

 collection, are quite straight, others curved. All arc more or less strongly 

 marked with undulations of growth. 



Making allowance for parts broken away, the length of the specimen 

 figured would be two and three-quarter inches and its width at the margin 

 of the cup about twelve lines. Another specimen (nearly straight), 

 which when perfect must have been two and a half inches in length, is ten 

 lines in width at the margin. A third specimen fifteen lines in length 

 is ten lines wide. This latter is evidently a young individual, and generally 

 in this genus the proportions of the young differ from those of the adult. 



Locality and Formation. — Cape Gaspe. Gaspe limestone. No. 1. 



Collector. — Sir W. E. Logan. 



ZaI'IIRENTIS CORTICATA. (N. Sp.) 

 PI. 1, figs. 4, 4a, 46. (2, 2a, 26.)? 



Description. — Corallam two or three inches in height, straight, or only 

 slightly curved, expanding to a width of eighteen lines at the height of two 

 inches. Surface (in some specimens at least) exhibiting scarcely any 

 trace of longitudinal striae, but marked with numerous obscure engirdling 

 wrinkles, from half a line to one line or more in width. In addition to 

 these, there is a set of fine striae, of which there appear to be four or five 

 in the width of one line. 



A fracture on one side of the specimen figured (fig. 4) shows that the 

 cup is about nine lines in depth. In a polished transverse section of the 

 same specimen at one inch from the base (just opposite the No. 4) forty- 

 four principal septa are seen. Between each two of these there is a 

 septum of a secondary series. Some of these latter appear to be obsolete, 

 others project about a line inwards, while a few can be traced some- 

 what further. On the cast of the interior of the cup of a specimen 

 which appears to have been about one inch in length, there are two 



