104 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



rently to the species Darned above, has long been in the Museum of thu 

 Survey, labelled as having been collected in the township of Bosanquet. 

 It is thirty-three millimetres in height from base to summit, thirteen 

 mm. in breadth, as measured from the apices of two lateral processes, 

 and four across the summit. The base is shortly and broadly conical 

 or bluntly pointed as viewed laterally, and distinctly quadrangular, with 

 the sides faintly concave, as viewed endways. In the centre of the base 

 there is a minute circular depression or pit, around which at a distance 

 of about two mm. there is a circular impressed line. The four lateral 

 ascending spinose processes upon which the genus was based, are 

 represented by four low conical protuberances, which are slightly 

 flattened laterally and truncated at their apices in a direction nearly 

 parallel to the main axis of the column. At the summit of each of 

 these truncated protuberances there is a longitudinally oval depression, 

 in the centre of which there seems to be a minute and narrowly linear 

 perforation. Immediately above these processes the ascending column 

 is eight mm. broad and about seven-eighths of an inch long, and from 

 this point it narrows gradually upwards to the summit, which, as 

 already stated, is four mm. in diameter. Throughout its entire length 

 the column appears to be circular, but the sjjecimen is very much 

 worn, and its central canal as seen from above, is distinctly four lobed. 



BLASTOIDEA. 



Pentremitidba filosa. (N. Sp. '!) 



Plate 14, figs. 1, 1 a, 1 b. 



Perhaps the same as Pcntremitcx Whitei, Hall, a description of which may be 

 found on page 150 of the Fifteenth Bep. N. York .St. Cab. Nat. Hist. 



Of medium size, height about one-fourth greater than the maxi- 

 mum breadth, which latter ranges from a little below the middle of 

 tlie specimen to the base of the radial sinuses: lateral outline sub- 

 ovate but conical at the base and truncated at the summit : transverse 

 section, in the thickest part, pentagonal in outline with neaidy straight 

 sides, which latter, however, are very faintly depressed in the centre, 

 and as faintly convex laterally. 



Ab-oral side inversely and doubly pyramidal, throe-sided at and 

 near the base of the body, but gradually becoming five-sided and pen- 

 lalobate above; its lower portion rather narrowly conical as viewed 

 sideways, its upper moiety broadening more vapidly upward and 



