PEOBOSCINA. 
21 
Dimensions . 
Length of an average zocecium ... *75 mm. 
Diameter of the same ... ... *2 ,, 
Length of peristome of the same ... -4 ,, 
Disteibijtion. 
Middle Chalk : Chatham. 
Figfees. 
PI. I. Pigs. 12a, h. The type - specimen from the above 
(Fig. \2a) and from the side ; X 18 dia. Gamble Coll. D. 3831. 
Afpinities. 
The specimen on which this ‘ species ’ is founded apparently 
grew on the sea-floor, or attached to some soft organism ; for it 
is now unattached, and shows no signs of having been fixed to any 
hard surface. The specimen is possibly only a form of S. granulata 
(Edw.), which lived on the sea-floor, half buried in ooze, so 
that great elongation of the peristomes became necessary. One 
or two of the zooecia show the amphora-like form often met with 
in S. granulata. Nevertheless, the specimen is so different from 
that common ‘ species ’ that in the absence of intermediate forms 
it seems inadvisable to unite them. 
D. 3831. A specimen (on slide). Middle Chalk. Chatham. Gamble Coll. 
Figd. PI. I. Fig. 12. 
PROBOSCINA, Audouin, 1826. 
Synonyms. 
Stomatopora, para, Hincks, Pergens, etc. 
Reptotuhigera, d’Orbigny, Pergens, etc. 
Riastopora, pars, d’Orhigny, Lonsdale, etc. 
Rhalangella, Hamm {non Gray). 
Tubulipora, pars, d’Orbigny, Vine, etc. 
Alecto, pars, Manzoni, etc. 
Idmonea, pars, d’ Orbigny. 
Diagnosis. 
Diastoporidae in which the zoarium consists of multiserial, 
elongate bands, which may be simple or branched, and are 
always flat and adnate. The zooecia are cylindrical, and 
