98 Canadian Record of Science. 
Stromatopora (now Solenopora) compacta could be found, 
and gives no figure nor microscopic characters whereby the 
species may be recognized. New that Solenopora compacta, 
Billings sp., is a well established species which finds place in 
the nomenclature of present writers, it appears from an 
examination of microscopic sections of the Paquette Rapids 
form, that it is distinct from the ordinary form and is 
readily distinguished therefrom by the large size of its 
z0cecia—they vary from 160 to 200 in the space of one 
inch, 7. é., each zocecium varies from 1-160th. to 1-200th. 
of an inch in diameter. The specific name Solenopora 
Paquettiana, is here proposed to receive such forms as 
this which present the generic characters of the genus 
Solenopora, but have zocecia or tubes much larger than in 
S. compacta, and also less wavy. The zoarium is also con- 
siderably larger than ordinary specimens of S. compacta. No 
diaphragins have been detected in the longitudinal section 
of this form. There must obviously have been diaphragms 
at more or less regular intervals in the tubes, but, as in 
most specimens of S. compacta, they are not evident. Very 
skilfully prepared sections of especially well preserved 
examples from the Trenton rocks of Poughkeepsie, N. Y., 
kindly presented to the writer by Prof. W. B. Dwight, of 
Vassar College, have revealed the tabulee of S. compacta. 
3. The third form occurs in the hard compact cherty 
limestone rocks of Quebec city at Céte d’Abraham, and 
closely resembles the type species S. compacta, but is clearly 
distinct from S. Paquettiana, both from the size and 
regularity of its tubes. From SS. compacta, the Quebec 
variety ‘ minuta, differs in having smaller zocecia, less 
regularly arranged and often very tortuous. There are 
from 480 to nearly 600 tubes in the space of one inch, and 
these are all in close contact. No septal teeth or spiniform 
projections from the wall inwardly have been detected in 
any of the zocecia, which are irregularly rounded polygonal 
and triangular at times. 
Under the microscope this form, S. compacta, var. minuta, 
