COPEPODA FROM IFALUK ATOLL 119 



his description, the record of these exceptionally large specimens 

 from the Indo-Pacific area must be taken with some reserve. 



In the Ifaluk collection the species proved to be unexpectedly well 

 represented in washings of algae and in sand samples; it seems to be a 

 characteristic element of the smaller reef fauna. 



Family Porcellidiidae G. O. Sars, 1904 



This family includes a single genus: Porcellidium Claus, 1860 

 {= Thyone Philippi, 1840). 



Genus Porcellidium Claus, 1860 



The type of genus is Thyone viridis Philippi, 1840; it has the 

 following species : 



Females Males 



Thyone viridis Philippi, 1840 T. viridis Philippi, 1840 



( = Porcellidium fimhriatum Claus, 1863; P. fasciatum Boeck, 

 1864; P. subrotundum Norman 1868; P. lecanoides Claus, 1889; P. 

 fimhriatum var. heraldicum Monard, 1928; P.f. var. macrurum Mon- 

 ard, 1928; P. lecanoides var. roscoffensis Bocquet, 1948; P. sarsi Boc- 



quet, 1948) 

 P. tenuicauda Claus, 1860 P. tenuicauda Claus, 1860 



( = P. dentatum Claus, 1860) 

 P. ovatum Haller, 1879 P. ovatum Haller, 1879 



( = P. parvuhan Haller, 1879; P. scutatum Claus, 1889; P. acuticaudatum 

 Thompson and A. Scott, 1903) 

 P. fulvum Thomson, 1882 P. fulvum Thomson, 1882 



P. interruptu7n Thomson, 1882 

 P. brevicaudatum Thompson and A. 



Scott, 1903 

 P. ravanae Thompson and A. Scott, 1903 



( = P. tuberculatum Wolfenden, 1905) 

 P. affi.ne Quidor, 1906 P. affine Quidor, 1906 



( = P. charcoti Quidor, 1906; P. rotundum Brady, 1910; P. australe 

 Brady, 1910; P. wolfendeni, Brady, 1910) 

 P. scotti Pesta, 1935 

 P. clavigerum Pesta, 1935 



The position of the following species is uncertain: 



Porcellidium spec. Pesta, 1935 



The species Porcellidium fimhriatum (= Porcellidium viride 

 (Philippi)) has been defined by Bocquet (1948) as "Supraespece," 

 by which vague term Bocquet probably wants to indicate that the 

 species can be separated into morphologic allj'^ and biometrically 

 more or less distinct local forms, separable especially by the structure 

 of the furca. Though the structure of the furca in this particular 

 genus undoubtedly is of major taxonomic importance, we must 



646-471—64 9 



