310 
Group Eudiphasia (Broch). 
The hydrothecae increase in breadth towards the distal end, 
and attain tlieir largest breadth at the aperture. The gonothecae 
are always provided with a number of projectious (leaves, spines), 
of different form and size, either placed in the distal end or spread 
over a larger portion of the gonotheca. 
To this group belong the following species: D. rosncea (L.) 
(22.), D. attenuata Hincks (22.), D. fallax (Johnst.) (22.), D. 
Wandeli Lev. (32), D. pinaster (Ell.-Sol.) (22.), D. pinnata (Pall.) 
(22.), D. alata Hincks (= Thuj. pharmacopola Allm.) (22.), D. 
paarmani Nutt. (44.), D. palmata Nutt. (45.), D. tropica Nutt. 
(44.), D. bipinnata Allm. (4.), D. scalariformis Kiikp. (Ij9.), D. 
mutulata (Busk) (7.), D. digitalis (Busk) (7.) = Desmoscyphus 
acanthocarpus Allm. (5.) and possibly Thuj . heteromorpha Allm. (4.). 
Group Abietinaria Kirchenp. 
The hydrothecae decrease in breadth towaids the distal end, 
and the breadth of the aperture is smaller — as a rule rnuch 
smaller — than the largest breadth of the hydrotheca. The go¬ 
nothecae are smooth or ringed, and rarely provided with two spines. 
Besides the 10 species, referred by Kirchenpauer to his 
genus Abietinaria, I also refer the following species to this group: 
A.coei Nutt. (44.), A. Traski Torr. (44.), A. amphora Nutt. (44.), 
A. gracilis Nutt. (44.), A. costata Nutt, (44.), A. annulata (Krp.) 
(44.), A. turgida (Clark) (44.), A. gigantea (Clark) (44), Diphasia 
Kincaidi Nutt. (44.), ? D. pulchra Nutt. (44.), (= Dynamena 
unilateralis Bonnevie (12, p. 78), Thuj. thujarioides (Clark) Nutt. 
(44.) and Sertularia ( Selaginopsis ) fusca Johnst. (= Th. salicornia 
Allm.) (1.). Lastly I shall set fortil some few remarks on the 
structure and synonymy of a number of the above species. 
In a number of tliem I have found an internal, median, ad- 
cauline tooth-shaped projection of different form and size, whicli 
is placed a little proximally to the free edge, and only seems to 
be present in such forms in whicli there is a well-developed ad- 
