44 
PEOBOSCINA. 
the branches do not anastomose as they so often do in that form, 
and by the branches subdividing less frequently. From Proh. 
cornucopice it differs owing to the greater diameter of the zooecia 
and the less crowded arrangement of the peristomes ; but the 
zoarial characters are very similar. 
The Ehodanian form Proloscina depressa (Orb.) is probably 
a worn specimen of this ‘ species.’ Vine’s figure of his Prohoscina 
dilatata, var. cantahrigiensis, is apparently based on the same form 
as his P. gracilis^ reussi. 
The Cellepora echinata^ Miinst.,^ is apparently an Oligocene and 
Miocene ally of this species; its zoarium rather resembles that 
of P. fasciculata, but the crowded arrangement of the peristomes 
removes it from close affinity to that species. 
LIST OF SPECIMEIIS. 
British. 
D. 441. On echinid fragment. Middle Chalk. Chatham. Gamble Coll. 
Figd. PI. III. Fig. 8. 
D. 464. Encrusting an Echinocorys, sp. Middle Chalk. Chatham. Gamble 
Coll. 
D. 3816. Encrusting a fragment of Echmocorys, sp., with Berenicea papillosa 
(Rss.). Middle Chalk. Chatham. Gamble Coll. 
D. 3861. Encrusting a fragment of Micraster, sp. (on slide). Middle Chalk. 
Chatham. Gamble Coll. 
D. 442. Encrusting a fragment of Echmocorys ^ sp. (on shde). Middle Chalk. 
Chatham. Gamble Coll. 
D. 2021. On Terebratula hiplicata. Bed Chalk. Hunstanton. Jesson Coll- 
Recorded as Prohoscina gracilis, Reuss, var. reussi, Vine : Quart. 
Journ. Geol. Soc. vol. xlvi. p. 469, specimen Xo. 12. It is 
a young specimen. 
D. 2022. On Terebratula hiplicata. Red Chalk. Hunstanton. Jesson Coll. 
The type of Prohoscina gracilis, Reuss, var. reussi, Vine : op. cit. 
vol. xlvi. p. 469 (specimen No. 12a), pi. xix. fig. 4. 
Foreign. 
D. 4389. A zoarium with Berenicea papillosa (Rss.), var. hagenowi, encrusting 
a fragment of Elasmostoma consobrina. Cenomanian : Craie 
chloritee. Cap de laHeve. Presented by W. Hill, Esq., F.G.S. 
D. 4386. A zoarium with Berenicea r eg ularis (Orb.), var. gamblei, encrusting 
Semiaster, sp. Villers-sur-Mer. Presented by 'W. Hill, Esq., 
F.G.S. 
^ Goldfuss : Petref. Germ. p. 102, pi. xxxvi. fig. 14. Von Reuss, Foss. 
Polyp. Wien. Tert. : Naturw. Abh. vol. ii. p. 52, pi. vii. figs. 14, 15. 
