120 H. J.. HANSEN. 
But after the removal of Cilicza and Ciliceopsis the 
genus Cymodoce comprises still a very good number of 
species described in the literature, and, according to my 
experience, numerous undescribed species from the Indian 
Ocean and the Pacific (from Japan to Australia) are found in 
various European collections. I propose, therefore, to accept 
Cilicea, and consequently to establish Ciliceopsis, but 
to consider both these genera—and probably Cassidinella 
—as having only sub-generic value. 
‘he genus Cymodoce and its sub-genera are exceedingly 
difficult to deal with. The difference between adult species 
of the two sexes is generally very large; the adult males are 
adorned with tubercles, bosses, or processes, which are want- 
ing or low in the females; when a mesial lobe is present the 
abdominal notch differs considerably in shape in the two 
sexes ; finally, the uropods show nearly always striking sexual 
differences. In the females the rami of the uropods are plate- 
shaped, often nearly similar in size and shape, but sometimes 
the exp. is rather small, in rare cases even very small; in the 
male the exp. is frequently elongate, sometimes very long, while 
the endp. either has preserved the same size as in the female 
and immature specimens, or has been reduced in size, or is 
even quite rudimentary. Several females or immature speci- 
mens have been established as species of Spheroma, while 
the males were described as forms of Cymodoce or Cilicea. 
From the coasts of England, France, Italy, and Tripoli I 
found in the British Museum animals belonging to the genus 
Cymodoce labelled with the following names: C. truncata 
(Leach), C. Lamarchii (Leach), C. emarginata (Leach), 
Sphxeroma Dumerilii (Leach), Sph. Ritchianum 
(Leach), Sph. Prideauxianum (Leach), Sph. curtum 
(Leach), Sph. Griffithsii (Leach), Sph. tridens (Spinola), 
Sph.spinosum (Risso), Cymodoce spinosa (White); fur- 
thermore, H. Milne-Edwards establishes C. pilosa from the 
Mediterranean. But at least C. truncata (Leach), S. 
Dumerilii, 8. Prideauxianum, S.curtum, 8.Griffithsii, 
S. tridens, and S. spinosum belong to the same species, 
