44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I48 



Glabella slightly expanded forward, with traces of lateral furrows. 

 Occipital furrow deep laterally, shallow medially; occipital ring but 

 partially preserved, Fixigenae convex and downsloping, about half 

 the glabellar width. Ocular ridges low and broad, paralleling the 

 border furrow. Border not well preserved, seemingly very narrow 

 at least in front of the glabella. Palpebral lobes shorter than average 

 for the genus ; posterior area wider (tr.) than occipital ring. Surface 

 of test with indistinct ornamentation. Length of largest cranidium 

 3.5 mm. 



Occurrence. — Collection cs-4. North Chatham. 



Discussion. — This form cannot be identified with any of the 

 species of Bonnia previously described, in particular with the nu- 

 merous species illustrated by the writer from the conglomerates of 

 Quebec (Rasetti, 1948). The chief characteristic is the breadth of 

 the cranidium, the glabella and the fixigenae. 



Disposition of material. — Figured specimens: U.S.N.M, 146040. 



BONNIA, species undetermined No. 2 

 Plate 11, figure 22 



Represented by an immature example. Cranidium of average shape 

 for the genus. Glabella but slightly expanded, of average convexity, 

 un furrowed. Occipital furrow narrow but well impressed ; occipital 

 ring incomplete, possibly spinose. Fixigenae, palpebral lobes, and 

 anterior border of average form. Length of cranidium 2.7 mm. Sur- 

 face of test smooth. 



Occurrence. — Collection cs-4. North Chatham. 



Discussion. — In the general proportions and lack of ornament 

 this form might be compared with Bonnia similis Rasetti. As far as 

 can be ascertained from one small, somewhat imperfect cranidium, 

 it seems to differ in the more posterior position of the palpebral 

 lobes. 



Disposition of material. — Figured specimen: U.S.N.M. 146041. 



BONNIA, species undetermined No. 3 

 Plate 12, figure 16 



Possibly represented by a few, incomplete examples. The descrip- 

 tion is based on the best specimen illustrated herein. Glabella of 

 average convexity, slightly expanded in posterior half, slightly tapered 

 anteriorly, with but traces of lateral furrows. Occipital furrow wide 

 and deep throughout; occipital ring long (sag.), extended into a 

 short, somewhat blunt spine. Fixigenae relatively narrow; anterior 

 border narrow in front of the glabella, wider laterally. Posterior area 



