14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 7(i 



Family HIPPOTHOIDAE Levinsen, 1909 



Genus CHORIZOPORA Hincks, 1880 



CHORIZOPORA BRONGNIARTI Audouin, 1826 



1925. Chorisopora hrongniarti Canu and Basslek, Les Byrozoaires du Maroc, 

 Memoires de la Soci^te des Sciences naturelles du Maroc, vol. 10, p. 23, 

 pi. 7, fig. 2. 



A single living ovicelled specimen on Lithothamnion (April 17, 

 1888). 



OcGui'rence. — Galapagos Islands, D, 2813. 

 Cat. No. 8482, U.S.N.M. 



Genus TRYPOSTEGA Levinsen, 1909 



TRYPOSTEGA VENUSTA Norman, 1864 



1920. Trypostega vemisia Canu and Bassler, Bull. 106 U. S. National Museum, 

 p. 330, pi. 85, fig. 15-16. (Bibliography, geographic distribution.) 



1928. Trypostega venustw Canu and Bassler, Fossil and Recent Bryozoa of 



the Gulf of Mexico Region, Proc. U. S. National Museum, vol. 72, art. 

 14, p. 77, pi. 8, figs. 5, 6. 



1929. Trypostega venusta Canu and Basslek, Bryozoa of the Philippines, Bull. 



100, U. S. National Museum, p. 248, pi. 22, figs. 9-11. 



The ovicelled zooecia not having frontal tuberosities show that 

 our specimens belong to the form striatula Smitt, 1873, just as in 

 the Philippines and in the Indian Ocean. 



Biology. — Our specimens were living and ovicelled and were 

 therefore in reproduction April 7-9, 1888. We have stated in our 

 work on the Gulf of Mexico that reproduction occurred from Janu- 

 ary to March, which must now be changed to April. 



Our specimens incrust shells and nullipores as in Europe these 

 being the most habitual substrata of this species. Nevertheless we 

 have observed rare colonies on bryozoa, {Steganoporella^ Stylopoma) , 

 corals, and hydroids in the Gulf of Mexico and on small pebbles 

 in the Philippines. 



The geographic extension of this species is rather great. It ap- 

 pears more abundant in the equatorial zone, but it extends in the 

 Atlantic up to the fiftieth parallel. The localities in the temperate 

 zone are very rare and not yet been dredged in the Mediterranean. 

 Perhaps it has been brought to the English Channel only by a cur- 

 rent from the Gulf stream. 



The geographic distribution which we gave in 1920 was incomplete, 

 and we believe it useful to give it anew, adding some bathymetric 

 notes. 



Occurrence. — Galapagos Islands, D. 2813 and D. 2815. 



Geographic distrihution. — Eastern Atlantic: Guernsey, 16 meters, 

 and the shores of Calvados, France, in the English Channel; Ma- 



