KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 59. NIO |. 11 



In the few specimens whcre thc calice is not so perfectly round as is usually the 

 case, the longer diameter has been measured. 



Miss Harrison says (17, p. 1024) with regard to the types of Gardiner: »Type II 

 is probably identical with Verrill's H. alternatus, a speeies which has escaped the no- 

 tice of several authors. This speeies possesses all the characters which separate Gar- 

 diner^ Type II from Type I, — the base smaller than the disk, with a slight constric- 

 tion above it and theri walls spreading obliquely outwards to the edge of the disk, 

 alternating costae, paliform teeth exsert before all septal cycles except the last, and an ill- 

 developed papillose eolumella which scarcely rises above the surfaee of the broad 

 shallow central fossa. » 



The author, however, is overlooking the fäets, that the calice of Gardiner's Type 

 II is relatively deep and that the presence or absence of paliform teeth is highly vari- 

 able. Besides these differences and the relation in size between the septa of the third 

 and fourth cycles, which is diffcrent in the two speeies, the outline of //. alternatus 

 Verrill is quite different from that of Type II: in the former the diameter is about 

 twice the height (in Verrill' s specimen the relation is 7:4, in those of the Swedish State 

 Museum average 13:6); but in Type II the diameter is equal to the height (in Gardi- 

 ner^ specimens the relation is 94: 97 for an average diameter of 9,4). 



For this reason I cannot agree with the opinion of Miss Harrison as to the ident- 

 ity of Gardiner's Type II with H . alternatus Verrill, though the latter is no doubt 

 more closely related to Type II than to Type I. 



Spongiocyathus Folkeson n. g. 



The genus is established on the four specimens described below. The agreement 

 between this genus and Ileterocyathus is very striking; the principal difference seems to 

 be the marked spongious consistency of the septa iji Spongiocyathus. The character- 

 istics of this genus thus are: Corallum simple, fixed upon a small gastropod shell, and 

 with a wormhole in its base. No epitheca. Calice subcircular. Columella more or less 

 developed. Septa in four cycles and six systems, exsert, generally thick and always of 

 a very spongious consistency; those of the third cyele are the smallest. 



Spongiocyathus typicus Folkeson n. sp. (Figs. 12—15). 



There are four specimens, which have a somewhat different appearance, owing to 

 the degree of the thickness of the septa: but as they agree in every other respect with 

 each other, they undoubtedly belong to the same speeies. 



1. 45 miles W.S.W. off Cape Jaubert, 2.7.11, 70 feet; 2. 45 miles W.S.W. off 

 Cape Jaubert, 16.7.11, 72 feet; 3. 42 miles W.S.W. off Cape Jaubert, 11.7.11, 36 feet; 

 4. 45 miles W.S.W. off Cape Jaubert, 18.7.11, 140 feet. 



figs. 12—13. - figs. 14- 



Xo. 



Average diameter 

 of corallum 



Height o t 

 corallum 





in mm 



in mm 



I 1 



11 



7 



2 



10 



5,5 



3 



8,6 



about 

 5 



4 J 



11,5 



8 



15. 







