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 hilaminata and multifida have been found in the Indian Ocean and at 

 the Cape of Good Hope, the latter at a depth of 720 meters. 



PUsioiype.—C&t. No. 68467, U.S.N.M. 



CHAPERIA CAMINOSA Ulrich and Bassler, 1904. 



Plate 14, figs. 2-4. 



1904. Membranipora caminosa Ulrich and Bassleb, Bryozoa, Maryland Geological Survey, 

 Miocene, p. 409, pi. Ill, figs. 3, 4. 



Ulrich and Bassler's original description follows: 



Zoarium adnate, forming a thin, single sheet of indefinite extent. Zooecia arranged quincuncially, 

 6§ measuring longitudinally and 7J to SA 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-Uke tube or hollow spine projecting obliquely over the zooecium next above. When 

 the ooecium is broken away a semiovate or quadrangular concave space 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 avictilarium 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 Cliaperia 

 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 avicularimn placed on 

 the ovicell. 



Occurrence. — Miocene (Choptank formation): Jones Wharf, Maryland (rare). 



Cotypes.—C&t. 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. 



