76 G. F. MATTHEW : ILLUSTEATIONS OF 



backward. Fixed cheek narrow, eyelobe close to the glabella, opposite the end of the third 

 furrow, the cheeks are depressed in front of the eyes, and are united in front of the glabella ; 

 in front of the glabella, the united cheeks descend and are depressed toward the anterior 

 margin, but no marginal fold is there visible. 



The facial sutiire appears to be parallel in its general course to the longitudinal axis of 

 the shield ; it cuts the margin obliquely, curving inward between the margin and the 

 eyelobe ; at this part it approaches close to the glabella, and then, curving outward along 

 the cheek, appears to return again and cut the posterior margin about as far from the 

 glabella as the space from the front of the glabella to the apex of the head shield.^ 



The thorax tapers regularly toward the base ; only the first seven segments are known ; 

 the axis is wide and high, and the rings strongly arched. The pleurœ appear to be 

 shorter than the rings of the axis, they are strongly arched and are bent downward at the 

 exti'emity. The pygidium is unknown. 



This ancient trilobite appears to have been an inhabitant of sandy shores, as it has only 

 been found imbedded in worm biirrows, or coprolitic nodules, or scattered sparsely over the 

 sandy layers of the red-streaked sandstones of Div. l.b. It is remarkable for its compact- 

 ness laterally, and for having the eyes close to the glabella ; the eyelobes have the appear- 

 ance of being directed forward, as represented in the species Conocori/phe Lijelli, from rocks 

 of similar age in Wales. 



Length of head-shield, 9 mm. Width between the facial sutures, 7 mm. Length of part 

 of thorax preserved, 9 mm. Width, 8 mm. 



Horizon and Locality. Found in the red-streaked sandstones, Div. l.y\ at Hanford 

 Brook, St. Martin's. Infrequent. 



SOLENOPLEURA, Angelin. 



The author has not had time to investigate the difficult and variable species of the 

 genu.s Pti/chojMfia, which occur in the St. John group. But the description of a species of 

 the related genus, Solenopleura, is here inserted with the consent of Mr. J. F. Whiteaves. 

 The species was collected from the St. John group, studied by Mr. Whiteaves, and drawn 

 by Mr. A. H. Ford, when connected with the Greological Survey of Canada in 18t8. 



Solenopleura Acadica, Whiteaves, ms. (Plate VII. Fig. 15.) 



Fourteen segments in the thorax ; five or six in the pygidium. 



Facial suture (as far as can be made out) agrees exactly with that of Solenopleura {cana- 

 liculata) as figured by Angelin, PI. VIII. page 2*7. The number of body segments (14) given 

 by Angelin with a query, is the same as in ours, as well as the position of the eyes and 

 the surface markings. 



The present species seems to differ from the <S. communis, Billings, in the position of 

 the eye, which, in the latter species is stated to be " situated a little in advance of the mid- 

 length of the head," whereas in the specimens from Porter's Stream, N. B., it is placed a 

 little behind the middle. 



' There is some doubt about the course of the suture \n this part, as the tests preserved do not show it (clearly. 



