76 



fied females — are of the same curious structure, the lobes are 

 long and, especially the last, carry dense brushes of setsfe," 



From observations of the three species — -namely Zuzara, 

 Isocladus, and Eaosphceroma — included in this and other 

 papers, I agree with Dr. Hansen as to their close relationship 

 and the necessity of uniting them. As there are no longi- 

 tudinal channels for the passage of currents of water beneath 

 in these three species, the same can evidently be provided for 

 by the large uropoda set in oblique direction. 



In my opinion Cycloidura venosa, Stebbing, and Zuzara 

 Integra, Haswell, are the same species, and I have treated 

 them as such. 



The descriptions always refer to the male except when 

 otherwise stated. 



Family SPH^EROMID^. 



Subfamily Sph^eromin^e, Hansen. 



Group Hemibrancrtat^e, Hansen. 



Genus Cyrnodoce, Leach. 



Cymodoce tuberculosa, Stebbing. PL xxi., figs. 1 to 20. 



Cyrnodoce tuberculosa, Stebbing, Ann. and Mag. Nat. Hist., 

 ser. 4, vol. xii., 1873, p. 95. 



Cyrnodoce tuberculosa, Whitelegge, "Thetis," Scientific 

 Results, p. 258. 



The body, except the head and first thoracic segment, is 

 covered with granules, which become spiniform and arrange 

 themselves in two transverse rows with smaller granules 

 between on each thoracic segment; small stiff hairs are scat- 

 tered amongst the granules, and are fairly plentiful. 



The forehead, which is gradually declivous anteriorly, is 

 slightly excavate in the transverse direction, and higher up a 

 faint rounded projection can be detected. 



The eyes are large and scarcely project. 



Indications of two depressed and coalesced rostral teeth 

 are present, while the two epistomial teeth are large and re- 

 curved, like those of the basal antennular joint, projecting 

 further than these. The antennular teeth are six in number, 

 the innermost and outermost being small. 



The antero-lateral angle of the first thoracic seg- 

 ment is produced somewhat, truncated at the tip, and 

 the groove of the head in which it works is deep: 

 the posterior angle is less produced. The three follow- 

 ing epimera are obtusely pointed, the first and second of 

 these slightly produced behind ; the following three are 

 rounded, the last more so, and it does not reach the level of 

 the ones which precede it. 



