352 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Genus MUCRONELLA Hincks, 1880 



MUCRONELLA(?) UNCIFERA, new species 



Plate 42, fig. 12 



Description. — The zoarium is unilamellar, cupuliform, convex. The 

 zooecia arranged in radial series, are distinct, short, transverse, 

 trapezoid ; the frontal is convex and formed of a tremocyst with large 

 pores. The apertura is very large, semielliptical, transverse, with 

 proximal concave border. The peristome bears three distal claws, 

 canaliculate and curved over on the aperture; the proximal mucron 

 is a large foliated oblique palette, erect, hiding a part of the aperture. 

 Sometimes a large ascending ungulated avicularium with pivot is 

 attached laterally to the peristome. 



Measurements. — 



Aperturaj^ =° 3 K ° mm ' Zooeciajf 2 ^f^ 55 mm ' 



1 Ua =0.35 mm. lZz=0.75mm. 



Affinities. — Our specimen is not a Mucronella, the frontal being a 

 tremocyst. The genus is certainly new, but as we have not yet 

 found either ovicell or operculum we are unable to correctly define it. 



Biology. — The singular and unexpected architecture of this strange 

 animal could inspire the sculptors of designers searching for new 

 models. The zooecia being short, the tentacles must be also. How 

 could they move in the spiniform complexity of the peristome. For 

 reasons of equilibrium of the cupuliform colonies, the large avicu- 

 laria frequently alternate in the same radial series of zooecia. We 

 have no idea of the best characters of such species in the present 

 state of the science. 



Occurrence. — D. 5355. Balabac Light, N. Balabac Strait; 8° 08' 

 10" N.; 117° 19' 15" E.; 44 fathoms; co. S. 



Eolotype.—C&t. No. 8132, U.S.N.M. 



Genus PORELLA Gray, 1848 



PORELLA PURPUREA Jullien, 1888 



Plate 43, fig. 1 



1888. Smittia purpurea Jullien, Bryozoaires Mission Scientifique du Cape Horn, 

 vol. 6, p. 54, pi. 2, fig. 4. 



Measurements. — 



ApertimJ* - , 1 " mm ' Zooeciaff 2 -**™% nm ' 



Ua =0.12 mm. \lz =0.50-0.50 mm. 



Affinities. — Our specimens encrust shells; they were dead and we 

 can not determine their color. All the characters indicated by 

 Jullien may be observed on them even the salient threads that en- 

 circle the zooecia. Our measurements accord rather well with those 

 shown on his figures. 



