COPEPODA FROM irALUK ATOLL 103 



and now Eesearch Associate Professor, Institute of Marine Science, 

 University of Miami, who collected the specimen and who, in fact, 

 collected most of the material described here. Of the remaining 

 species of Perissocope, two, P. typicus and P. cristatus, appear to be 

 pelagic, or at least temporarily pelagic; two, P. xenus and P. littoralis, 

 are fomid in washings of algae from moderate depths. 



Family Tisbidae Stebbing, 1910 



Lang (1948) has suggested a subdivision of this family into two 

 subfamilies, with the following genera : 



Subfamily Tisbinae Stebbing, 1910: genera Tisbe Lilljeborg, 1853 

 (type species Cyclops furcatus Bau'd, 1837), Scufellidium Claus, 1866 

 (type species Psamathe longicauda Philippi, 1840), Cholidya Farran, 

 1914 (type species C. polypi Farran, 1914), Sacodiscus C. B. Wilson, 

 1924 (type species Aspidiscus fasciatus Norman, 1868), Tisbella 

 Gurney, 1927 (type species T. timsae Gurney, 1927), and Tisbintra 

 Sewell, 1940 (type species T. nankaurica SeweU, 1940). 



Subfamily Idyanthinae Lang, 1944: genera Zosime Boeck, 1872 

 (type species Z. typica Boeck, 1872), Idyella G. O. Sars, 1905 (type 

 species /. pallidula G. O. Sars, 1905), Tachidiella G. O. Sars, 1909 

 (type species T. minuta G. O. Sars, 1909), Idyanthe G. O. Sars, 1909 

 (type species Idyopsis dilatata G. O. Sars, 1905), Pseudozosime T. 

 Scott, 1912 (type species P. browni T. Scott, 1912), Idyellopsis Lang, 

 1948 (type species /. typica Lang, 1948), and Idyanthopsis Bocquet 

 and Bozic, 1955 (type species /. psammophila Bocquet and Bozic, 

 1955). 



The genera Phroso Brady, 1899 (type species P. gracilis Brady, 

 1899), and Metaphroso Brady, 1910 (type species M. gracilis Brady, 

 1910) have been insufficiently characterized and consequently are of 

 uncertain position. The genus Paridya Sewell, 1940, falls within the 

 genus Tisbe as defined by Lang (1948, p. 364). 



Representatives of two species of Scutellidium occur in the present 

 collection. 



Genus Scutellidium Glaus, 1866 



Since Lang's reviews (1936, 1948) of the genus Scutellidium Claus 

 1866 {^Psamathe Philippi, 1840; =^Machairopus Brady, 1883), 

 several new forms have been described. The followmg list shows the 

 present position of this genus ; the type species is Psamathe longicauda 

 Philippi, 1840. 



646-471—64- 



