56 
BULLETIN OF THE LABORATORIES 
Decade iii, vol. i, p. 306, 1883. The specimen described was a near- 
ly entire pigidium, differing from all known carboniferous species in 
the long spinous processes, which resemble those of Dalmanites. 
It might be observed that the great size of the median lobe is sug- 
gestive that possibly the marginal part of the pigidium had been some- 
how removed, leaving the ribs irregularly preserved. The pigidium 
might then belong to Brachymetopus^ but such a mutilation would most 
assuredly have been noticed by Prof. Claypole. 
The specimens referred to Proetus consist of pigidia and frag- 
ments and the reference is based on analogy simply. 
Of the species of Phulipsia figured, it is not necessary to give 
descriptions, while condensed descriptions of the others, as far as they 
can now be drawn up, are given. 
The various authorities who have described P. cequalis ( — P. pos- 
thumus,) disagree even in essential characteristics, so that for the pres- 
ent its position must remain doubtful. 
P. articidosa is closely related to P. clijfoi'di^ from which it differs 
in the greater number of coalesced somites. 
“ Pigidium [the only part known] one-fourth broader than long, 
axis one-third breadth, consisting of seventeen coalesced segments, 
which diminish rapidly in breadth to the extremity, which is bluntly 
round, and less than one third the breadth of the axis at the proximal 
end; axial furrows deeply marked. Plurse 13, terminating abruptly 
within the margin, which is finely striated, unornamented.” 
P. carinata^ is too imperfect in the specimens as yet discovered 
to be worthy of description. 
P. cliffordi. Pigidium twice as long as broad, axis one-third the 
breadth at proximal border, rapidly diminishing to one-seventh ; the 
border is posteriorly one-seventh the length of the pigidium, but di- 
minishes laterally; axis of 13 somites, with 10 lateral plurse, which 
bifurcate as they approach the margin, unornamented. 
P. laticaudata. Pigidium much broader than long, very strongly 
trilobed; axis elevated, consisting of 12 somites; each strongly ridged 
and ornamented with a series of minute tubercles. Plurse 9, broad 
for half their length, minutely ornamented, losing themselves near 
margin ; length 6 mm., breadth 9 mm. Glabella tumid, imperfect. 
Our restoration of the head of P. leei is from badly distorted 
specimens and hence may not be accurate in every particular. The 
The pigidium is one-fifth broader than long, the axis forms one-third 
