54 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
Astian of Italy (Seguenza, Neviani); Sicilian of Italy (Seguenza, Neviani); Post 
Pliocene of Italy (Neviani). 
Habitat. —Kerguelen Islands (42 meters); Malouines Islands (6 to 16 meters); 
Bare Orange, Smiths Strait (12 to 27 meters); Straits of Magellan (16 meters); 
Southern Tierra delle Fuego (11 meters); Port Charcot (40 meters); Booth Wandel 
Island (30 meters); station 320 of the Challenger, near Montevideo (960 meters). 
The varieties bilaminata and multijida have been found in the Indian Ocean and at 
the Cape of Good Hope, the latter at a depth of 720 meters. 
Plesiotype. —Cat. No. 68467, U.S.N.M. 
CHAPERIA CAMINOSA Ulrich and Bassler, 1904. 
Plate 14, figs. 2-4. 
1904. Membranipora caminosa Ulrich and Bassler', Bryozoa, Maryland Geological Survey, 
Miocene, p. 409, pi. Ill, figs. 3, 4. 
Ulrich and Bassler’s original description follows: 
Zoariura adnate, forming a thin, single sheet of indefinite extent. Zooecia arranged quincunciallv, 
6J measuring longitudinally and 1\ to 84 diagonally, in 3 mm. Opesia subcircular, separated by one- 
half to two-thirds their diameter; when the ooecium is wanting, a rim-like border encloses the anterio- 
half of the opening. Ooecia very high, with a rib across the top, and just in front of the latter a promi¬ 
nent chimney-like tube or hollow spine projecting obliquely over the zooecium next above. When 
the ooecium is broken away a semiovate or quadrangular concave 6pace is uncovered between the ends 
of following zooecia. The hollow tubule behind the zooecial aperture is always present, but it is 
usually worn down so as to appear as merely a thick-rimmed pore. Where the zooecial arrangement 
is irregular or changed, a second or even a third tubule, each directed forward, may occur between the 
three zooecia. 
This species is a perfectly characterized Chaperia. We reproduce figures of 
the types corrected with more care. Above each zooecium there is a very constant, 
small, erect, triangular avicularium with its beak above. A large pedunculate 
avicularium appears in a corner of the cryptocyst; it is almost always broken and 
appears only as a very irregular pore. There are four large distal articulated 
spines. We have from the Pleistocene of Palermo (Sicily) a variety of Chaperia 
annulus Manzoni, 1875, very close and which presents also a very constant, small, 
distal, triangular avicularium. The present species differs from it in the presence 
of the large, pedunculate avicularium, and its ovicell not smooth and formed of 
two thick, separable calcareous layers and in the triangular avicularium placed on 
the ovicell. 
Occurrence. —Miocene (Choptank formation): Jones Wharf, Maryland (rare). 
Cotypes. —Cat. No. 68469, U.S.N.M. 
CHAPERIA PARVISPINA, new species. 
Plate 14, fig. 1. 
The figured specimen is the only one which has been found. It incrusts an 
oyster shell and is too incomplete to permit an exact description. However, the 
complete absence of large distal articulated spines is a specific character which 
amply justifies the establishment of a new species. They are replaced by a variable 
number of minute and very fragile spines. 
