88 CAUFOnNIA ACADF.MY OF SCIENCES. 



DiKFEKKNTlAL ClIARACTKKS OK TIIK ThKEK CaLIKOKNI AN Sl'ECIKS OF CaK YOIMI VLI.I A. 

 Septa iu (our oycloH ( form eoriiiitc; Iwolvo more prominent ooBtio ) C. pfdroetuia 



(form Hliort, iuverKoly Huliconical, costiu 1 

 et|iml near the ailioo, nltornnting iu aize [C. arnoldi 

 ui'nr biwe ) 



Septa iu four com- 1 \ 



pU'te cvcleH, mnnv \ form Hubflnbcllale, costm excepting neiir the ( „ ,„iif.,„;.„ 



nitMulicrs o( the hfth 1 oalicnlftr margin indistiuct ( 



prexeut ( ) 



As tlie descriptions ami the above table sliow, for the <lifTerentiaLion of the spe- 

 cies, especial stress is laid upon the niiml)er of the septa, the form, iiiid the costal charac- 

 ters. AUhoiij,'h i-ach of the throe species is based on a single specimen, the author does 

 not believe it possible for intergradation to occur within the horizons from which 

 they were collected. C. jiedm'uds and C. arnoldi appear to belong in the same 

 group (section) of the genus; hut V. califondca presents great and striking difTer- 

 ences from each of the preceding. 



Genus Paracyathus Milne- Eduards li- Ilaime. 



Verrill has described three species of Paracyathus from the west coast of 

 North America, viz.: Paraci/athus caltha,^ Paracyathus stearnsi,- and Paracyathus 

 humitis.^ The first two species mentioned are from Monterey, California; the last 

 mentioned is from the Pearl Islands. 



Expressed in tabular form the differences between these three species are: — 



f Costai distinct only at edge of calice, be- ) 



_ ,, r ■ . low represented by rows of grauules: axes of / P. caltha 



Corallam .5 in.* or ,. "^ .- ■ / ,., • ° \ 



. , . , ; ,. calice, .45 in./. 32 in ) 



more in height; live j' ' ' 



eomp e eye s Scabrous, subequal costte, distinct to base, 1 



"P ° I near base every fourth or sixth costa more y P. slearnti 



[prominent; axes of calice, .72 in. /. 50 in ) 



Corallum only .2 in. | Q^gj^ feeble, except near calicular margin. ) „ , ... 



in height; four com- diameter of Circular calice, .22 in ..A^' '"'""'" 



plete cycles of septa. ( ' ) 



According to the diagnostic characters given by Verrill, these three species 

 are very distinct. 



4. Paracyathus pedroensis Vaughan, sp. nov. 

 Plate III, Figs. 1 and In. 



Corallum subturbinate in shape, base damaged, apparently not especially expanded; trans- 

 verse outline of calice elliptical, slightly deformed. 



Costje not prominent, but distinct from the calicular margin to the base, subequal, some- 

 times every third or every fifth may be slightly more prominent than those intervening, the edges 

 usually flatlish, sometimes slightly crested. Bottoms of the intercostal furrows usually flattish; 

 granulations crowded on the costze, and present in the intercostal furrows also. 



> Proc. Bo«». 80c. N»t. Hl»t.. Vol. XII, 18«9, p. 394; Trans. Conn. Acad. 8cl., Vol. I, 1870, p. 537, PI. IX, flgs. 9, 9a. 



« Ppoc. Best. 9oc. S«l. Hl«l.. Vol. XII. 1869. p. 393; Trang. Conn. Ac«d. Scl., Vol. I, 1870, p. 537. 



>Trkn.q. Conn. Acad. Scl., Vol. 1. 1870, p. 638. 



* Tbese dKlmalj of an Inch can be competed Into mlUlmetere by reckoning .1 inch = 2.5 mm. 



