282 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
shale with invertebrate fossils was fortunately recognized as contain- 
ing the types of all Lea’s species, and these upon the present occa- 
sion it is my purpose to supply with somewhat better illustrations 
than the original ones. ‘There is little remedy in prospect for the 
imperfectness of the type-specimens themselves, since, as just stated, 
the original locality was not described and the horizon has not been 
rediscovered, so that the species can not be rehabilitated upon better 
material. 
Of the five invertebrate species described in Lea’s paper two are 
based upon such mere fragments that it is doubtful if they could be 
definitely fixed, even with additional material from the same fauna. 
A single species is unquestionably valid, while of the two remaining, 
one is with little doubt identical with it and the other is probably the 
same as a species already in the literature. 3 
Lea’s remark, therefore, that “As these forms are the only ones yet 
found that I am acquainted with, I have deemed it better to give an 
exact representation of the specimen itself and to give provisional 
names, that geologists may be able to recognize them when met with 
again,” seems tinged with unconscious irony. 
The remaining species, three in number, are of somewhat unusual 
interest. One of these belongs to the genus /larttina, a type of struc- 
ture hitherto known only in Nova Scotia, while the two others, which 
represent the genus 7egulifera, are interesting not only on their own 
account but because that genus has as yet been found only in Europe, 
the original species having been obtained in the Carnic Alps, while 
a second doubtful representative has been described from the Ural 
Mountains. 
HETEROCCG:LIA, new genus. 
General shape moniliform, consisting of subspherical units joined 
end to end in straight or nearly straight lines; sometimes branching. 
Each unit consists of a spherical outer wall interrupted at both ends 
by the passage of a large cylindrical cloaca, which is continuous from 
‘cell to cell. The outer wall is interrupted also by large spout-lke 
ostia. 
The mode of growth of this organism is not quite clear from the 
material examined. There is some evidence that the cylindrical 
cloaca may have been first prolonged, or in perfect specimens may 
normally have projected from the upper end, and that upon this 
the spherical outer wall was formed. The constitutent spheres are 
sometimes just in contact, but sometimes also they appear to be sep- 
arated by an interval bridged only by what seems to be a section of 
the cloaca. On the other hand, two consecutive spheres may overlap, 
in which case the lower end of the upper or younger one is invagi- 
nated. In any event the two cells even when in contact have discrete 
spherical walls throughout. The cylindrical cloacal walls seem to be 
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