. Smithsonian miscellaneous collections . ksi than to the spicules of P. fenestrata. Dr. Hinde identifies this species from Nevada, but I find that theNevada spicules are smaller and the rays proportionally moreslender. The spicules and surface of the shale are coated with a blackcarbonaceous-appearing film abounding in minute crystals of largest fragment of the wall is 6 by 4 cm. and gives no indicationof the form of the sponge. 1 British Fossil Sponges, 1S88. Pt. II, pp. 107, i( NO. 6 MIDDLE CAMBRIAN SPONGIAE 3O9 Formation and locality.—Middle Cambrian : (35k) Burgess shalemember
. Smithsonian miscellaneous collections . ksi than to the spicules of P. fenestrata. Dr. Hinde identifies this species from Nevada, but I find that theNevada spicules are smaller and the rays proportionally moreslender. The spicules and surface of the shale are coated with a blackcarbonaceous-appearing film abounding in minute crystals of largest fragment of the wall is 6 by 4 cm. and gives no indicationof the form of the sponge. 1 British Fossil Sponges, 1S88. Pt. II, pp. 107, i( NO. 6 MIDDLE CAMBRIAN SPONGIAE 3O9 Formation and locality.—Middle Cambrian : (35k) Burgess shalemember of the Stephen formation, on the west slope of the ridgebetween Mount Field and Wapta Peak, i mile ( km.) northeastof Burgess Pass above Field, British Columbia. Also (61 f) in the thin-bedded limestones about 350 feet () higher in the same section. DIAGONIELLA Rauff Diagoniclla Rauff, 1894, Palaeospongiologie Palaeontographica, Vol. XL,1894, p. 248, pi. 1, fig. 21. Dr. Hermann Rauff proposed name as subgenus of Protospongia. Fig. 7.—Diagoniclla cyathiformis (after Dawson, fig. 13). but without description, and gives Protospongia coronata Dawson asexample, also mentions P. cyathiformis Dawson. Dawson in reviewing the Little Metis fossil sponges considers thatthe diagonal arrangement of the spicules is hardly sufficient varia-tion from Protospongia- to warrant establishing the genus Diagon-iella but he found other peculiarities of these species (P. coronata,P. cyathiformis), which might fairly entitle them to constitute dis-tinct sections of the genus. 1 I am in agreement with Rauff in placing the species with thediagonally arranged spicules in a genus distinct from Protospongia. 1 Trans. Roy. Soc. Canada, 2d sen, Vol. 2, Sec. IV, 1896, p. 106. 310 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6/ Diagoniella is distinguished by the diagonal arrangement of therhombic openings formed by large cruciform spicules; the obliquelyarranged spicules serve to separate the genu
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