NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA — CYCLOSTOMATA 741 



The zoaria of this well known species are large, erect, prominent, 

 light brown in color. The zooecia are arranged biserially, paired, form- 

 ing a loose spiral that encircles the stolon within the limits of an inter- 

 node. An internode is limited to one series of zooecia. The zooecia are 

 completely connate along their entire length when the tentacles are 

 completely retracted. The zooecia are of uniform length, ranging from 

 0.71 to 0.74 mm. In width, the range is from 0.08 to 0.09 mm. The 

 polypide has a gizzard. 



This species appears to be widely distributed, having been previously 

 reported from European waters of the Atlantic and in North and South 

 America from Chesapeake Bay to Santos Bay, Brazil. In the Pacific 

 there have been several reports from the Australian region. This is the 

 first report of its occurrence in the waters of the eastern Pacific. 



Hancock Stations: 133-34, Socorro Island, west of Mexico; 253-34, 

 and 257-34, Port Culebra, Costa Rica; 265-34, Petatlan Bay, Mexico, 

 and 486-35, Tenacatita Bay, Mexico. Depth, 5 to 20 fms. 



Amathia vidovici (Heller), 1867 

 Plate 79, fig. 2 



Valkeria Vidovici Heller, 1867:128-129. 

 Amathia vidovici, Osburn, 1940:340. 



Zoaria erect, tall, with elongate internodes. The zooecia are small, 

 biserial, forming a spiral in the distal portion of the internode, leaving 

 for the most part the proximal portion of the internode bare. Zooecia 

 connate only at their point of origin and attachment to the stolon. Their 

 length ranges from 0.32 to 0.41 mm. 



This species has not appeared in the literature as frequently as some 

 of the other species of the genus Amathia. It was originally reported 

 from the Adriatic Sea by Heller. On the Atlantic coast of North 

 America it has been reported by Osburn and by Hutchins. Osburn also 

 reported it from Puerto Rico. 



The specimens in the Hancock collection are from about 20 stations, 

 ranging geographically from Santa Rosa Island, southern California 

 (in the northern Channel Islands), to Ecuador and the Galapagos 

 Islands. 



Amathia distans Busk, 1886 

 Plate 79, fig. 1 



Amathia distans Busk, 1886:33. 

 Amathia distans, O'Donoghue, 1925:16. 

 Amathia distans, Osburn, 1940:339. 



