NO, 4 HARTMAN : POLYCHAETOUS ANNELIDS 401 



In addition, new species are described as follows; one in Capitella 

 and 3 in Notomastus; also 2 new species in 2 new genera are erected, and 

 a new generic name is proposed for a previously described species. These 

 are: 



Capitella ovincola, new species 

 Capitita amhiseta, new genus and species 

 Notomastus magnus, new species 

 Notomastus lobatus, new species 

 Notomastus hemipodus, new species 

 Leiocapitella glabra, new genus and species 

 Dasybranchus platyceps, new species 

 Anotomastus, new genus for Eunotomastus gordiodes Moore 



The total number of genera is 24. Seventeen are known for a single 

 species only; they are A notomastus, Barantolla, Branchiocapitella, Capi- 

 tellethus, Capitita, Capitomastus, Dasybranchethiis, Eunotomastus, 

 Heteromastides, Leiocapitella, Leiochrus, Mediomastiis, Parheteromas- 

 tus, Protocapitella, Pseudocapitella, Pulliella, and possibly also Capi- 

 tellides. 



A chart has been used instead of a key for the Capitellidae to facili- 

 tate the identification of the various genera. For this purpose the follow- 

 ing scheme is inserted. The outlines represent anterior ends of capitellids 

 that are schematically shown in left lateral view with the prostomium at 

 the left end. Grouping is by number of segments in the thorax, ranging 

 from 9 in the first to 20 in the last. The letter S represents long pointed 

 setae, H represents long-handled hooks, and G represents genital hooks. 

 In 2 genera, Capitella and Capitomastus, the arrangement of these parts 

 differs slightly in the 2 sexes, as indicated. In Anotomastus, on the 

 other hand, the first appearance of hooks varies slightly between indi- 

 viduals, regardless of sex. In Capitellethus the presence of setae in the 

 peristomium is not certain, hence the S is preceded by a question mark. 

 In Capitita, a middle abdominal region is characterized by the reappear- 

 ance of setae with hooks, and far posterior segments have only single 

 long setae in notopodia. The presence or absence of branchiae is shbwn 

 where known, but this character may have little generic significance. 

 The separation between thorax and abdomen, if distinct, is indicated by a 

 heavy vertical line; if weak or transitional, a wavy line is used. The 

 specific characters are taken up in greater detail for the species concerned. 



