PENNATULACEA. 



179 



Bellonclla Gray ; Nidalia Gray ; Paralcyonium M. Ed\v. ; Sarakka Dan. ; 

 Alcyonium L., A. diyitatum, dead men's fingers; Lobularia Savigny ; Sarco- 

 phyton Lesson, with dimorphic polyps ; Lobophytum Marenzeller, with dimorphic 

 polyps ; Anthomastus Verr., dimor- 

 phic polyps ; Nannodendron Dan., 

 dimorphic polyps. 



Fam. 7. Nephthyidae. A branched 

 coenenchyma with sterile Lase and 

 terminal polyps. The latter do not 

 exhibit separate calycine and ten- 

 tacular regions, and there is no in- 

 vagination of the latter ; when at 

 rest tentacles folded over oral disc. 

 Buds arise from fine endodermal 

 canals between the polyps. Vocrin- 

 cjin Dan.; Fulla Dan.; Barathrobius 

 Dan. ; Gersemia Marenzeller ; Ger- 

 semiopsis Dan.; Drifa Dan.; Duva 

 Ivor, and Dan.; Euncphthya Verr.; 

 Ammothea Sav. ; Ncphthya Sav. ; 

 Spongodes Lesson ; Paranephfhya 

 Wright and Studer ; Sderoncphthya 

 "Wi. and St. ; Chironephthya AVr. 

 and St.; Siphonogorgia Ki.il 1. 



Fam. 8. Helioporidae.* Compact 

 corallum formed in the jelly of the 

 coenenchyma. The corallum is tra- 

 versed by tubes closed above, called 

 coenenchymal tubes (possibly modi- 

 fied siphonozooids), and by tubes 

 continued from the polyp calycles. 

 Both systems of tubes are divided 

 by tabulae and are united by endo- 

 dermal canals in the superficial 

 coenenchyma. False septa formed 

 by denticulations of the margins of 

 the calycles. Heliopora, Blainville. 



Sub-order 4. PENNATULACEA.f 



Unattached polyp colonies with a 

 stalk embedded in mud or sand, and 

 a r/tchis bearing polyps. The stalk 

 generally has an axial rod. 



The stalk is without polyps and 

 is embedded in mud or sand. The 

 rachis is a continuation of the stalk and carries the polyps, which are arranged 



FIG. 147. Kophdbelemnon Lc-uclMrtii. 



* H. N. Moseley, "The Structure and Relations of the Alcyonarian Heliopora 

 Coerulea," Phil. Trans., 1876. 



t A. Kolliker, Anat.-syst. Bcschrcib. d. Alcyonaricn Alt. 1. Die Pennatuliden, 

 Frankfurt-a-M., 1872. A. Kolliker, "Report on the Pennatulidae," Challenger 

 Reports, 1880. 



