FAUNA OF THE ST. JOHN GEOUP. 57 



example figured by Brog-ger the geual spiue is close to the posterior termiuatiou of the 

 dorsal suture, but iu the Acadian and also in the Swedish form the spiue is placed op])o- 

 site the middle of the cheek, and iu fact in some of the Acadian examples is nearer the 

 anterior thau the posterior end of the cheek. 



Sculpture. — The surface is minutely granulated. 



Size. — Middle piece of the head shield, length, 3 mm. ; width, 6 mm. Movable check, 

 length, 3 mm. ; width, 2| mm. Length of genal spiue, 2 mm. 



Horizon and Locality. — In limestoue lentiles of Div. 3 b at Kint;- Street, St. John. 



Var. 



Occurring in the same fragments of limestone which hold /S. JlagilUfer is a variety 

 which presents constant marks of difference The glabella is broader, and has more dis- 

 tinct furrows, the posterior furrows iu place of beiug transverse, as in the type, are arched 

 backward as iu the next species, but they do not as in that, cause the surface of the gla- 

 bella to be corrugated, nor are they as in it, heavily impressed at the sides of the glabella. 

 On the contrary, they begin at some little distance from the edge of the glabella, and are 

 equally impressed all along. The head shield resembles that of Eurycare angustatum, 

 Aug., as figured by Brogger (I.e. Tab. xii, fig. 3), but differs in being emarginate in front 

 of the glabella, and the glabella also is not so completely semicircular in front. This 

 variety may be the broad form of S. flngillifer. 



Ctenopyge spectabilis. Brog. var. (PI. XIII, figs. 13 a and b.) 

 1882 — Clcnopyge spectabilis. Brog. 'Die Silurischon,' Etagen 2 und 3. Tab. ii, fig. IS a-t. 



The most noticeable of the species of trilobites in the limestone lentiles of Division 3 b 

 is Brogger's species above named. Being larger than S. flagillifer, though not nearly so 

 large as the example figured by Dr. Brogger, it more readily attracts the eye. There are 

 some points of difference between it and the type beside the obvious one of size. I do 

 not find that the genal spiue in the Acadian variety is as long, and there is also a differ- 

 ence in the proportionate width of the glabella, which in the Acadian form is wider than 

 in that from Norway, and the middle furrow of the glabella is more transverse. 



Comparing the two Acadian species, I see little difference between the cheek of this 

 species and that of C. flagillifer. The cheek is perhaps less tumid and the genal spiue 

 more slender. The glabella, in addition to its more angular form and larger size, is more 

 prominent in front, where also the anterior marginal fold is thickened and separated from 

 the glabella by a very narrow area. The two strongly impressed glabellar furrows, 

 directed backward, as well as the third or anterior furrow, also distinguish this species 

 from S. flagillifer. 



Sculpture. — Surface minutely granulated. 



Size. — Head-shield, middle-piece, length, 5 mm. ; width, !) mm. Movable cheek, 

 length, 4.5 mm. ; width, 3.5 mm. Length of genal spine, 3 mm. or more. 



Horizon and Locality. — In the limestone lentiles of the black shale of Division 3 b at 

 King-street, St. John. 



Sec. IV, 1891. S. 



