450 TUBULIPORIDjE. 



GEOGRAPHICAL DISTRIBUTION. Greenland (Fabricius) : 

 Davis Straits, 100 fathoms; Hamilton's Inlet, Labrador 

 (Wallich) : Gulf of St. Lawrence (Dawson) : Bahusia 

 (Loven) : Spitzbergen (Swed. Exped.) : west of Nova 

 Zembla, lat. 72 30 7 , long. 52 45', 5-20 fathoms (Stux- 

 bergandTheel). 



RANGE IN TIME. English Crag (S. Wood) : Canadian 

 Postpliocene (Dawson). 



Genus IDMONEA, Lamouroux. 

 Der. From Idmon, one of the Argonauts. 



IDMONEA, Lamx. Expos. Meth. : Blainville : Milne-Edwards : Johnston : 



Reuss : D'Orbigny (part.) : Busk : &c. 

 RETEPORA (part.), Goldfuss : Lamk. 

 DIASTOPORA (part.), Michelin. 

 TUBULIPORA (part.), Lamk. 

 CRISINA (part.), D'Orbigny : Smitt. 

 TUBUUPOHA, subgenus IDMONEA, Smitt. 



GENERIC CHARACTER. ZOARIUM erect and ramose, or 

 (rarely) adnate ; branches usually triangular. ZOCECIA 

 tubular , disposed on the front of the branches, ranging in 

 parallel transverse or oblique rows on each side of a mesial 

 line. 



IDMONEA is most closely allied to Tubulipora, and must 

 rank, I think, in the same family with it. Its erect habit, 

 and more or less triangular branches, built up of tubes, the 

 free extremities of which form transverse parallel rows, 

 disposed subalternately on each side of a central line, give 

 it a very characteristic facies ; but such a form as /. ser- 

 pens, which in its leading character is a true member of 

 the genus, is a connecting link between it and Tubulipora. 



