the Trondhjem Fiord. 451 



3. Scrupocellaria iiitennedi<i, sp. n. (PI. XIX. tig.-;. 9, 10.) 



Rodberg, on the precipices. 



I cannot assign tliis form satisfactorily to any known 

 species. It comes nearest to S. scrupea, a southern form not 

 yet known north of tlie south of Enghxnd. With that species 

 it agrees in the form of the fornix, of the lateral avicularia, 

 and of the vibracular cells, which latter are present on every 

 zooecium, and in the absence of an avicularium on the front of 

 the cell. It differs in its more slender habit and more elon- 

 gated cells (in S. scrupea the mouth-openings overlap each 

 other, here they are quits distinct), and in the ooeoium, wliich 

 in S. scrujyea is wider than high and very convex, here is 

 somewhat loop-formed, being narrower at the mouth than 

 a little above it, much longer than wide, and flattened cen- 

 trally ; there are four spines at the summit of the cell. In 

 habit this species approaches more nearly to S. scruposa^ 

 from which it is distinguished by the presence of a fornix. 

 From the northern <S'. scabra it differs in the absence of an 

 avicularium on the front of the zooecium and the entirely 

 different form of the vibracular cell *. 



4. Caherea Ellisii, Fleming. 

 Rodberg and Trondhjem, frequent. 



5. Bicellaria Alderi, Busk,= Z?. unisjv'an, M. Sars. 

 Trondhjem, 150 fath. ; Rodberg. 



6. Flustra IJarhei, Busk. 



Not uncommon on the precipices. Here, and in all other 

 West-Norway fiords where 1 iiave taken the species, the 

 habit of the s[)ecies is different trom that of specimens from 

 the sea round Shetland. For the form of the latter sec 

 Hincks, pi. v. tig. 6, which was drawn by Mr. Alder from a 

 specimen in my collection. In Norway, on the other hand, 

 the zoarium generally assumes the form of long narrow strips. 

 Flustra Burleei is common in the West-Norway fiords. It 



* I take this oppoitunitv of disaonting from Mr. Iliucks's view that 

 my 'S'. incnnis is the .same as the Miocene fossil <S'. elllptica, lit'u.ss ; one 

 of that author's tigures shows tiiree S])ines on the front mar{,nn of the 

 colls, and the dorsal view looks quite different, representing the zotecia as 

 very tumid in that part. Many of lleuss's si)ecie8 descrihed in tliis and 

 other papers may prove to be recent; but it is dillicult, except in the 

 case of very marked forms, to judge, without comparison of .specimens, of 

 the identity of fossil witli recent species, es])ecially in such a genus as 

 iScniporclliin'd, where most of the organs in a fossil an; in an imperfect 

 state. 



34* 



