REPORT ON THE POLYZOA. 41 



sometimes the row of zooecia is continuous, but often more or less interrupted at the 

 side, in which case it has the appearance of two Idmoneie joined back to back. This has 

 been found fossil, and sometimes called Idmonea disticha, but as " Eetepora disticha" of 

 Goldfuss apparently relates to two or three species, and as there has been much confusion 

 in the use of the specific term disticha, I found it necessary to rechristen it ; and 

 although Dr. Pergens has since called it Idmonea disticha, the reasons already given 

 seem to justify the new name. 



Habitat. — Washings of dredge between Fayal and Pico, 50 to 90 fathoms; abundant." 



Defrancia striatida, Busk (PI. III. fig. 45). 



Defrancia striatula. Busk, Crag Polyzoa, p. 117, pi. xviL fig. 5. 



Zoarium stipitate. Zooecia in much elevated, bi-multiserial rays starting from near 

 the centre and extending to the margin of the cup. Central portion and interspaces 

 without cancelli ; opening of the ovicell infundibuliform between two of the rays, but 

 the inflation is so very slight, that it would pass unnoticed except for the opening. 

 Dorsal surface divided into subhexagonal divisions, the peduncle longitudinally ridged. 



In appearance this resembles Defrancia lucernaria, Sars, but differs in not having 

 the central portion cancellate. It is also much like Ttdynlipora hrongniartii, M. Ed. and 

 Manzoni, and also like Pelagia insignis, Mich., but we are yet much in the dark con- 

 cerning the classification of such forms, so that it is difficult to know whether we should 

 place it with Tubidipora or Defrancia. 



Habitat. — Washings from dredge between Fayal and Pico, 50 to 90 fathoms. Fossil 

 — Coralline Crag. 



»• 



Lichenopora holdsworthii, Busk, occurs from Station 142, 150 fathoms, on 

 Adeonella regidaris. 



Idmonea atlantica, Forbes, add Station 49, 85 fathoms. 



(ZOOL. CHALI,. EXP. PART LXXI.X. — 1888.) Kkkk 6 



