20 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



bordered by a narrow, rounded rgii that is continued obliquely 

 inward and forward, as an ocular ridge, across the fixed cheek 

 to the dorsal furrow opposite the anterior pair of glabellar fur- 

 rows. Glabella, including occipital ring, subquadrilateral, with 

 sides slightly curved inward and front broadly rounded, moderately 

 convex ; the average sized glabella is marked by a pair of short, 

 shallow- furrows that extend obliquely inward and backward about 

 one-third the distance across the glabella, and a pair of nearly trans- 

 verse, short furrows that divide it into a short lobe on each side and a 

 large anterior frontal lobe ; the latter has a short, shallow furrow 

 on each side about midway of its length that extends directly in- 

 ward toward the central third of the width of the glabella ; the 

 glabella of a crandidilim 23 mm. in length has a pair of deep, 

 oblique, posterior furrows, and, in advance of them, four pairs of 

 faint, short, nearly transverse furrows, the posterior pair of which 

 are between the strong, oblique, posterior furrows and the longitu- 

 dinal, median third of the glabella ; a small dorsal shield with a 

 cephalon 1.3 mm. in length, shows the oblique, posterior glabellar 

 furrow and two pairs of the anterior furrows ; occipital furrow 

 strong, sharply defined, and curving forward at its ends ; occipital 

 ring strong, rounded, arching slightly backward with its antero- 

 lateral angle extending forward. Free cheeks slightly convex, with 

 the body rising from the inter-border furrow to the base of the 

 elongate, low eye lobe. The facial sutures cut the posterior margin 

 within the middle third of the distance from the dorsal furrow to 

 the outer margin ; they curve gently outward and then inward 

 across the border, and thence with a slight sigmoid curve to the 

 base of the eye lobe; arching over the latter, they extend forward 

 with a slight outward arching to and across the frontal border, so 

 as to cut the frontal margin within a longitudinal line drawn for- 

 ward from the outer margin of the palpebral lobe. 



Thorax with seven nearly transverse segments ; axial lobe convex 

 and arching slightly backward ; a small, low node occurs at the 

 center near the posterior margin, and a transverse, rounded, low 

 ridge at each end next to the dorsal furrow ; the pleura is nearly 

 straight, somewhat flattened, and terminated by a sharp spine that 

 extends obliquely outward and backward a short distance, except 

 on the third segment, which has a strong spine extending back- 

 ward nearly to a hue opposite the posterior third of the pygidium ; 

 pleural furrow broad at the dorsal furrow and narrowing to its 

 end at the base of the terminal spine ; a rounded, elongate, subtri- 

 angular tubercle occupies its inner half ; the anterior border of the 

 pleura next to the dorsal furrow is a narrow, rounded ridge, which 



