FAMILY SPHHROMIDA. 119 
(Dana), both originally referred to Spheroma. Sphe- 
roma integrum (Hell.) may perhaps be an Isocladus, but 
more probably it is a species of Zuzara (Leach). 
(5) Zuzara (Leach).—According to my examination of 
types in the British Museum and animals received from 
Dr. Chilton, Zuzara semipunctata (Leach), Z. diadema 
(Leach), Z. integra (Hasw.), and Cycloidura venosa 
(Stebb.) belong to this genus, while Zuzara emarginata 
(Hasw.) must be referred to the genus Haswellia (Miers). 
Spheroma integrum (Hell.) is probably a species of 
Zuzara, perhaps an Isocladus; Cymodoce armata 
(M.-Edw.) has been transferred to Zuzara by Haswell, but 
this reference seems to me to be rather dubious. 
(6) Cymodoce (Leach).—This genus, Cilicea (Leach) 
and Ciliczopsis (n. gen.) are very closely allied ; Cassidi- 
nella (Whitelegge), which is imperfectly described as to one 
of the most important features and unknown to me, belongs 
probably to the Cymodocini, and if so it is scarcely distinguish- 
able from certain forms of Cymodoce. The male of Cymo- 
doce, Cilicwa, and Ciliceopsis are easy to separate, but 
the females of Cymodoce cannot be distinguished from 
those of Cilicewa; in adult females of certain species of 
Cymodoce the mesial lobe of the notch is scarcely dis- 
tinguishable, and the notch therefore rather similar to that 
in Ciliceopsis, but the females of the latter genus differ 
in aspect from those of Cymodoce and have the end of the 
exopod of urp. produced and very acute, a feature not ob- 
served in Cymodoce. Itmight perhaps have been advisable 
to cancel Cilicza and not to establish Ciliceopsis, thus 
including all species of hemibranchiate Spheromine possess- 
ing an abdominal notch—Bregmocerella excepted—in the 
genus Cymodoce. But, on the other hand, it is always 
difficult to suppress a genus as a mere synonym, when it 
comprises a certain number of species, and is allied to another 
very rich genus: if Cilicea be suppressed the genus Cymo- 
doce will be extremely large. When Cilicza is maintained 
it is necessary to establish Ciliceopsis, and in the future 
two or three new genera of similar quality must be erected. 
