34 
PEOBOSCINA. 
It represents in tlie Cretaceous tlie type of Proloscina, which 
P. rigauxi (Sauv.) represents in the Jurassic,^ for both have 
short, strongly corrugated zooecia, which are grouped as broad 
tufts. P. cunningtoni also resembles this species, and represents 
the divaricata type.^ The ‘ species ’ is important, because it 
may he regarded as the simplest form of a series of Prohoscirue, 
differing from the three previous ‘ species ’ owing to the greater 
thickness and shorter length of the zooecia. The three ‘ species ’ 
P. angustata, P. ramosa, and P. fasciculata have long narrow 
zooecia like those of Stomatopora gracilis ; P. crassa and its allies 
have shorter, stouter zooecia like those of S. granulata. 
Prohoscina crassa was founded on a Neocomian specimen; but 
the species ranged from that age onward to the Senonian. It 
is very variable, and the grouping of the specimens referred to 
the ‘ species ’ is facilitated by its subdivision into five varieties — 
P. crassa (Eom.), var. a. typical form. 
1. divaricata (Orb.). 
c. francorum (Perg.). 
d. alectodes nov. 
e. elevata, nov. 
a. Proboscina crassa, var. typica. 
Synonymy. 
Aulopora ? crassa, von Romer, 1839. Verst, nordd. Ool., Nachtr. p. 15, pi. xvii. 
fig. 5. 
,, ,, Romer, 1840. Verst, nordd. Kr. p. 18. 
? Idmonea ,, js>ars, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 86. 
Proboscina ,, pars, d’Orbigny, 1854. Bry. Cret. p. 848. 
VlEIETAL ChAEACTEES. 
Zoarium crowded, biserial or multiserial, with uniserial offshoots. 
Peristomes not much elevated. 
Disteibution. 
Neocomian — Hilstbon : Schandelabe. 
Hilsconglomerat : Schoppenstedt. 
1 Cat. Jur. Bry. p. 69, pi. ii. fig. 6. 
* Ibid. p. 67, pi. ii. fig. 4. 
