OF THE NORTH-POLAR EXPEDITION. 239 



(very abundant), 10-160 fins, (clay and stone) (Smitt) ; Newfound- 

 land (D'Orhigny) ; ?. Crag (fossil) (S. Wood); in lat. 66° 59' N., 

 long. 55° 27' W., 57 fms. {Norman). 



Although there can be little doubt that this very abundant 

 Arctic species is included in M. d'Orbigny's Celleporaria incras- 

 sata, I can see no reason whatever for considering that it has any 

 thing in common with the Mediterranean form figured by Mar- 

 sigli, which has an entirely different aspect, to judge from the 

 wretched figure contained in his work, and which was taken by 

 Lamarck as the type of his C. incrassata. I have therefore ven- 

 tured to retain the appellation I gave this species in 1856, deem- 

 ing it highly probable that it represented Mr. Couch's species, 

 notwithstanding his statement that the branches are compressed, 

 whilst they are invariably cylindrical and tapering in the Arctic 

 form. Perhaps, however, in view of the multiple applications of 

 the name cervicornis to species of Escliara and Cellepora, it would 

 be better to use another term altogether. 



The agreement in general aspect between this species and that 

 of the Crag Cellepora coronopus of Mr. Searles Wood is very 

 striking; but, upon comparison of the minute characters, I am not 

 prepared positively to regard the two as identical. ^ 



Suborder II. CYCLOSTOMATA. 



Fam. 1. Diastopoeid^:, Bush (Brit. M. Cat. pt. iii. p. 27). 



Genus Mesenteripora, Blainv. 



1. Mesenteripora meandrina ?, Searles Wood (sp.). 

 Diastopora meandrina, S. Wood, Ann. Nat. Hist. (1844) xiii. p. 14. 

 Mesenteripora meandrina, Busk, Crag Polyzoa, p. 109, pi. xvii. fig. 2, 



pi. xviii. fig. 4, pi. xx. fig. 2 ; Smitt, I. c. 1866, pp. 398 & 432. 

 ? Mesenteripora Eudesiana, M.-Edw. Sur les Crisies Sfc. pi. 14. fig. 1. 

 ? Mesenteripora compressa, D'Orb. I. c. p. 756. 

 ? Ditaxia compressa, Hayenow, Bryoz. Maastr. p. 50, pi. 4. fig. 10. 



Rab. Franklin-Pierce Bay, Aug. 10, 1875, 15 fms. (H. W. F.) ; 

 Greenland (Torell), 16-40 fms. ; ? Coralline Crag (fossil) (& 

 Wood). 



The resemblance between this species and the Mesenteripora 

 meandrina of the Coralline Crag is so close as hardly to admit of 

 doubt as to their identity. But in this regard I am disposed to 

 place more importance upon the absence of anastomoses between 

 the folds of the zoarium than Professor Smitt is willing to allow. 



