CLARK: NEW FOSSILS FROM NEAR BOSTON. 477 
a row of very stout high tubercles situated on the axial lobe, al- 
most high enough to be called spines. Unfortunatelj^, the 
material of which the fossil was composed was exceedingly friable, 
with the result that the specimen was badly damaged merely by 
rubbing against the sides of the tray in which it was resting. The 
tubercles and much of the rest of the pj'gidium were abraded. 
It may be that the type material originally carried higher spines 
than the specimens now show. 
Weymouthia nobilis (Ford). 
Raymond, 1913, p. 102, figs. 15, 16. 
This species, originally discovered at Troj^, New York, and 
rediscovered by the writer at North Weymouth, Massachusetts, 
after the type had been lost, has recently been reported by Kiaer 
from the Lower Cambrian rocks of Norway. Originallj' known 
from a single specimen at Troy, this genus is now found to be 
nearly cosmopolitan in range. We have two specimens: a cepha- 
lon and apygidium. The cephalon is proportionately longer than 
in the type; the pygidium is of the usual shape. 
Callavia, two or more species. 
Numerous fragments of individuals belonging to this genus 
occur in the collection, indicating a species with cephalic widths 
of from 5 mm, to 15 mm. None of them is well enough preserved 
to be identified with any of the species that is found at North Wey- 
mouth, although some are probably conspecific with the latter. 
Ptychoparia attleborensis (Shaler and Foerste). 
Grabau, 1900, p. G81. 
This is the commonest trilobite present. We know it from 
several examples of the cephalic shield only. They are all small, 
2 or 3 mm. across and about as long. The type material consists 
of both minute and larger specimens, but none of the larger forms 
occurs in our material. 
Agraulos sp. 
We have one spcciinon, imperfect and poorly presorvod, hut it 
belongs without a doubt to this genus, although specific ileter- 
mination is out of the question. 
