44 BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
CALLOPORA (?) SPECIOSA Gabb and Horn, 1862. 
Plate 9, fig. 13. 
1862. Membranipora speciosa Gabb and Horn, Monograph Polyzoa Secondary and Tertiary forma¬ 
tions of North America, Journal Academy Natural Sciences, Philadelphia, ser. 2, vol. 5, 
p. 159, pi. 20, fig. 45. 
The original description is as follows: 
Colony encrusting in irregular patches, composed of elongated, oval cells, often crowded out of 
their normal shape. Cells arranged in longitudinal lines and in somewhat irregular quincunx, often 
assuming a transverse arrangement; aperture occupying the whole of the surface, cell walls plain, 
angular, at their edge dr slightly rounded. Interior of the cell, regularly concave, with the sides of the 
concavity reaching almost to the top of the walls; in new cellules the germinal plate only is seen. This 
germinal plate often extends for a considerable distance beyond the colony (half an inch) and is marked 
by irregular longitudinal lines, frequently bent suddenly in an oblique direction and then continued 
longitudinally as before. Between the cellules are frequently open angular spaces, caused by the 
inaccurate apposition to the cellules. 
Occurrence. —Miocene: Chiriqui, Central America. 
CALLOPORA (?) MULTIPORA Gabb and Horn, 1862. 
Plate 33, fig. 12. 
1862. Siphonella (Fluslrellaria) multipora Gabb and Horn, Monograph Polyzoa Secondary and 
Tertiary formations of North America, Journal Academy Natural Sciences, Philadelphia, 
ser 2, vol. 5, p. 154, pi. 21, fig. 38. 
The original description follows: 
Colony free (arranged in a tube in the only specimen we have seen), cellules outside, back, or 
inside of the tube showing the outline of the cellules. Cellules oval, juxtaposed, placed in irregular 
quincunx. Opening larger, occupying nearly the whole surface of the cellule; usually of the same 
shape as the cellule, sometimes having the proximal end wider than the distal end. Cell walls convex 
or flattened; marked by a variable number of pits often surrounded each by a distinct elevation or wall. 
The mouth is sometimes constricted by a small rim, parallel with the ordinary wall, placed inside of, 
and below it. This rim is ornamented in the same manner as the larger one. 
Occurrence. —Pleistocene: Santa Barbara, California. 
Genus AMPHIBLESTRUM Gray, 1848. 
(For description see Bulletin 106, U. S. National Museum, p. 156.) 
AMPHIBLESTRUM CONSTRICTUM Ulrich and Bassler, 1904. 
Plate 13, figs. 1-6. 
1904. Amphiblestrum constrictum Ulrich and Bassler, Bryozoa, Maryland Geological Survey, 
Miocene, p. 413, pi. 115, figs. 6,, 7; pi. 118, fig. 15. 
The original description is as follows: 
Zoarium forming crusts of small extent upon shells, the types growing on a Pecten. Zooecia 
arranged in rather irregular rows, 6 to 8 in 3 mm. Aperture subovate, more or less constricted in front 
of the midlength, enclosed a sloping and finely striated border, widest posteriorly. Frontal lamina 
very little developed forming the sloping and transversely striated border just mentioned. Ovicells 
abundant, large, moderately convex, the middle portion distinguished by being minutely pitted or 
porous. Avicularia of moderate size, usually one, rarely two to each zooecium. of the same type as in 
A. flemingi but with the apex more prominent. 
