M \ i;"* I. \ \it (;i:oi,()(iic.M, sikvkv 209 



rolllidcd ;is well ;i,- liiPLicr ;i |M'it II res. 'The iiir-oporcs ocelli' ill the 

 iM.-iciiliic .-iihI ill llic (Icprt'sx'd .-|i;icc> liclwccii the /.(>(icci;i. arc S()iiirtliii)<; 

 like (wiee a> mlllle|•ull^ as llic laller. ami liaNc >iiiall lliou^iii variable 

 a|iertiircs >>e( in llie hotloiiis (if rdiiiiilcil nr aiii:iilar ilcprcssions. liiiier 

 (liaiiicler i^\' /.(Miceial a|iertiire- almiit n.s nun., with foiir in the s[)aec of 

 1.(1 nun. In voiiiil;- nr siii^htly wnni exainples the inaculae are not 

 i-eadily dist iii,u'iiishcd, the iiiesupnrcs ['(datively larg'er and the two sets 

 of inoiilhs inoi'e nearly alike tlinn in the condition described above. 

 Gonoeysts laT<i'e, appearing as rounded or irregular iiillations of the 

 snrface perforated by the mouths of zooerdal tubes which pass through 

 them without interruption. Beside each zooecium is the orifice of a 

 smaller tube, the nature of which is not understood. \\']ien the outer 

 wall of the gonocyst is broken away, the zooeeial tuljes, together with 

 the small tubes accompanying them, are turned in every direction away 

 from the center. Between them the mouths of the mesopores are 

 covered by a perforated pellicle. 



The axial hollow or tube varies between 0.2 and OA mm. in diameter, 

 is wrinkled transversely and further constricted at irregular intervals. 

 At the constrictions a thin curved plate is often observable, but that it 

 extends completely across the cavity^ has not been observed and from 

 the evidence at hand it is at least doubtful that it ever does. The tubes, 

 as seen in fractures, present no evidence of diaphragms, but the con- 

 necting perforations in the walls are quite distinct. They occur mostly 

 in transverse rows, two or three of the rows in a space equalling the 

 width of a tube. 



Superficially there is considerable resemblance between this species 

 and Heteropora (Multicrescis) parvicella Gabb and Horn, a common fossil 

 of the Upper Cretaceous deposits at Vincentown, IST. J. The ramulets 

 of that species, however, are more slender and divide less frequently 

 while its zooecia and mesopores appear more scattered. But the prin- 

 cipal difference lies in the central hollow which is wanting in Gabb and 

 Horn's species and distinguishes Cavaria from Heteropora. Of the 

 three species of Cavaria described by Hagenow, only C. ramosa, the 

 t3'pe of the genus, is at all similar. In this the axial hollow is rela- 

 tively larger and is crossed by strong transverse partitions. The branches 



14 



