NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 



161 



, . , lha = 0.15 mm. r, 



Measurements. — Aperture ^ _p-- Aooecia 



Z2 = 0.65 mm. 



Za = 0.06 mm. "" ""[ Z2 = 0.40-0.45 mm. 



Affinities. — The present new species differs from Laminopora contorta Michelin, 

 1842, in the position of its avicularium below the aperture. It differs from Lami- 

 nopora arhuscula Calvet, 1907, in the greater length of its apertura (O.lo-and not 

 0.11 mm.), in its bdameUar zoariimi and in its apertura not occupying two-fifths of 

 the zooecial length. 



The avicularium is very irregular, sometimes straight with the beak directed 

 ■ above, sometimes transverse, triangular, or elliptical. 



Occurrence. — Miocene (Bowden horizon): Santo Domingo (verj- rare). 



Eolotype.— Cat. No. 68675, U.S.N.M. 



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Fio. 28. — Genus Laminopcrra Michelin, 1842. 



A-F. Laminopora contorta Michelin, 1842. A. Sketch of aperture, X 85, showing elongated einuB. 

 B. Zooecia, X 25. C. Mandible, X 85. E. Lateral view of a zoarium showing large warious %dbracula. 

 F. Zoarium, natural size, illustrating branching at right angles after forming very short branches only. 

 (A-F, after Waters, 1919.) 



G-J. Laminopora arhuscula Calvet, 1902. G. Zooecia, X 45. H. Operculum, X 90, viewed>n 

 the outer side. I. Operculum, X 90, viewed on the inner side. J.. Zoarium, natural size. (G-J, 

 after Calvet, 1907.) 



Genus ADEONELLOPSIS MacGillivray, 1886. 



(For description, see Bulletin 106, U. S. National Museum, p. 563.) 



ADEONELLOPSIS COCCINELLA, new species. 



Plate 24, figs. 5-8. 



Description. — The zoarium is bilamellar with small irregular fronds. The 

 zooecia are distinct, little elongate, elliptical, little convex; the frontal is perforated 

 by four to seven stellate pores. The apertura is terminal, semikmar, with a slightly 



