ÏHB FAUNA OP THE ST. JOHN C4K0Ur. 119 



This species resembles C. bvfo (Hicks) of the English Cambrian rocks, but differs in the 

 following particulars : it grows to a larger size and has no eyes ', the front margin is not 

 so heavily impressed, nor is the triangular part so wide, the tubercles on the shield are 

 more numerous than represented in the figure of C. bxfo, and there is no tubercle on the 

 outer posterior corner of the cheek. It may be found at St. John, Radclifi's, etc., in 

 Division Ic. 



3. — CoNOCOEYPHE Walcotti, n. sp. [Figs. 36 and 366.) 



Only the cephalic shield is known ; this is semi-circular, without siaiues. 



The anterior margin well arched forward, with a narrow and well rounded fold. Suture 

 in about the same position as that of C. Baileyi; in specimens that are shortened by pressure, 

 the initial point is about as far from the apex of the shield as that is long ; in others that 

 are narrowed, the distance from the front equals the combined length of the glabella and 

 occipital ring. 



The glabella rather flat, bounded by a distinct furrow. The glabellar furrows are 

 three pairs, not well defined in the examples known, but apparently similar in course and 

 length to those of C. Baileyi. 



The occipital ring as in that species, but with the tubercle more distinct, and always 

 carrying a slender spine ; in the examples known, the ring projects behind the posterior 

 line of the shield. 



The j9oste»w marg m is bent forward at the extremity. Fold rather narrow. Furrow 

 well marked, arched forward in the middle, widening toward the extremity. 



The cheeks are high next the glabella, descending toward the front and sides ; they 

 are rather higher than the glabella, and are connected in front. The ocular ridge begins 

 more than a third from the front and extends across the cheek to the posterior corner ; 

 ramifying ridgelers are numerous, crowded, and not very distinct. 



Sculpture. — The surface is closely covered with fine granulations without, but marked 

 on the inner surface also by numerous minute pittings, which, in the mould of the interior 

 of the test, have the appearance of small spines. These pits, or pores, are connected by 

 numerous fine, thread-like strife. These strite are similar to those found on the inner sur' 

 face of the test in Clenocephaliis Matthetvi, but in the species Walcotti they haVe a more net- 

 like arrangement, and are foiiud covering a baud that crosses the cheek behind the eyelobe ; 

 they are also found on the front of the glabella : in the two other tuberculated species 

 occurring, at St. John, the striœ connecting the tubercles, or pores, are confined to the 

 eyelobe and anterior marginal fold and the sjjace between them. 



Tliorax and Fygidium unknown. 



Development of the Young. — The examples of the young tests in this species are not 

 stiflB.ciently numerous or perfect to form the basis of remarks on changes during the period 

 of growth. The following will show that it differed but little from C. Baileyi in its pro- 

 portions : — 



'The eyes of that species appear to be rudimentary, for Dr. Hicks apeaks of them aa "small and scarcely 

 visible." 



