Puritan Expedition.

54 p. : ill. ; 24 cm.Includes bibliographical references (p. 50-54)."Fifty-six species of Bryozoa Anasca have been identified in the present collection from the Gulf of California. Three are believed to be new species, and two are new subspecies. Twenty-one species are added to the faunal list of the area. Of the 51 previously described species identified in this collection, many of which are well known and widely distributed, it is interesting to note that 65 per cent have have a geographical distribution that includes both temperate and tropical waters throughout the world; 8 per cent were found only in cool and warm temperate waters; 8 per cent were found to be restricted to warm temperate waters; and 19 per cent are known to be confined to the tropical waters. Within the Gulf of California, none of the species with a worldwide distribution restricted to the tropics was found north of Pulpito Point, Baja California, with the majority ranging from Coronados Island southward to Mazatlán. The bathymetric range of the Bryozoa in the collection is from intertidal to a maximum deph of 50 fathoms, well within the confines of the littoral zone. Fifty-three species were represented in both the eulittoral and sublittoral subdivisions of the zone. Three were found solely within the sublittoral at a depth of from 40 to 50 fathoms. Sixteen species were recovered from depths that did not exceed 26 fathoms, restricting them to the eulittoral zone"--P. 50