PEOBOSCIXA. 
33 
D. 3846. Zoarium of yar. toucasi (Orb.), Echinicorys scutatus 
Froboscina crassa (Rom.), var. framo)u/n, Jficropora, etc. Middle 
Chalk. Chatham. Gamble Coll. 
Six zoaria of var. toucasi (Orh.), encrusting fragments of Fchinocorys. 
Middle Chalk. Chatham. Gamble Coll. 
A young zoarium of var. toucasi (Orb.), encrusting an echinid plate. 
Middle Chalk. Chatham. Gamble Coll. 
A crowded series of var. toucasi (Orb.), encrusting Echinocorys 
scutatus with Froboscina crassa (Rom.), var. francorum. Middle 
Chalk. Chatham. Gamble Coll. 
"With Membranipora, sp., on fragments of echinid. Middle Chalk. 
Chatham. Gamble Coll. 
With Stomatopora granulata (Edw.) and Berenicea papillosa (Rss.), 
on Echinocorys scutatus. Middle Chalk. Chatham. Gamble Coll. 
With sp. Middle Chalk. Chatham. Gamble Coll. 
With Stomatopora granulata (Edw.), Membranipora, sp., Romalo- 
stega, sp., etc. Middle Chalk. Chatham. Gamble Coll. 
With Berenicea regularis (Orb.), on Terebratula biplicata. Red 
Chalk. Hunstanton. Jesson Coll. Recorded by Vine : Quart. 
Journ. Geol. Soc. vol. xlvi. p. 473, specimen No. 28b. The 
specific determination is doubtful, the colony being young and 
imperfect. 
? D. 2029. On worm-tube. Red Chalk. Hunstanton. Jesson Coll., No. 19. 
Recorded by Vine as Froboscina toucasiana, op. cit. p. 473 ; but 
the specimen is indeterminable. 
D. 3865. 
D. 4155. 
D. 4200. 
D. 381. 
D. 3815. 
D. 3838. 
D. 3814. 
?D. 2038. 
4. Froboscina crassa (Romer), 1839. 
Synonymy. {Vide under varieties.) 
Diagnosis. 
Zoarium partly uniserial and Stomatoporiform ; partly biserial 
and multiserial. 
Zooecia short and stout. Cylindrical or subfusiform. Walls 
usually strongly wrinkled. 
Peristomes well developed ; strongly raised in one variety. 
Affinities. 
This species is characterized by its apparent combination of 
the characters of Stomatopora, Froloscina, and Berenicea. The 
zoarium begins in the condition of the first-named, and isolated 
parts of it might be indistinguishable from the last. But the 
general character of the multiserial parts of the zoarium are 
distinctly those of Proloscina. 
D 
