BRYOZOA. in 



•*•**•* Zooecia few in conical bundles of two or more 3. 



3. Subterminal apertures not elevated XIII. Phacelopora. 



3. Terminal apertures, elevated at right angles to axis of branch, fre- 



quently free XCVTII. Filifascigera. 



*■*#* Zocecia numerous 4. 



4. Zoarium a more or less flattened expansion or attached stem a. 



a. Of flattened attached stems sometimes widening or uniting into 

 sheets, tubes slightly or not at all projecting.. VI. Proboscina. 



a. Spreading fronds, with ends of tubes projecting aa. 



aa. Free, bifoliate VIII. Diastoporina. 



aa. Attached, tubes on one side only VII. Bcrenuea. 



a. Obconical or cup- shaped, attached by center of sides with epi- 

 theca, tubes not projecting XCIX. Discosparsa. 



4. Zoarium a branching cylindrical stem with more or less freely pro- 



jecting tube ends b. 



b. Tubes regular, distant, generally much exserted.. XII. Mitoclema. 



b. Tubes crowded slightly exserted, branches hollow, cavity divided 



by transverse partitions C. Cavaria. 



Zocecia in compound zoaria, with interstitial cells or mesopores 5*. 



5* Walls of adjoining zocecia thoroughly amalgamated and pierced by numer- 

 ous pores, no lunaria 5. 



5. Variously formed generally massy with basal epitheca, and uniform 



zocecial apertures CI. Ceriopora. 



5. Massy or branching, numerous mesopores or interstitial cells between 

 the zooecia CII. Heteropora. 



5. Of hollow branches the cavity divided by transverse plates; surface 



with maculae and mesopores C. Cavaria. 



5* Walls minutely porous, lunarium present, often very prominent, surface 

 with maculae or monticules 6. 



6. Encrusting c. 



c Lamellose expansions bb. 



bb. Mesopores abundant //. 



//. Lunarium forming pronounced hood. 



XV. Ceramoporella. 

 11. Lunarium not hooded, interspaces with vesicles. 



Fistulipora. 



bb. Mesopores few 22. 



22. Mesopores scattered XVIII. Anolotichia. 



22. Mesopores mostly in maculae XVI. Crepipora. 



c. Disc-shaped, apertures in radiating ridges.. XXV. Botryllopora. 

 6. Lamellate or massy d. 



d. Mesopores few, decreasing toward margin.... XIV. Ccramopora. 



d. Mesopores numerous cc. 



cc. Lunarium well raised XX. Bythotrypa. 



cc. Lunarium moderate, interspaces with vesicles. 



XXI. Fistulipora. 

 cc. Lunarium a strong bidentate process, interspaces with 



vesicles XXIII. Buskopora. 



6. Branching, more or less cylindrical e. 



e. Branches hollow, lined on inside with epitheca, lunarium hooded. 



XVII. Coeloclema. 



