FAMILY SPH#ROMID&. 121 
for which I—at least provisionally—apply the name C. trun- 
cata (Leach) ; some specimens of 8. Ritchianum and one 
of the specimens of C. Lamarchii belong besides to C. trun- 
cata, while other specimens referred to the two last-named 
forms are identical with C. pilosa (M.-Edw.); on C. emar- 
ginata (Leach) I shall not express an opinion. Spheroma 
Lesueuri (Risso) has been transferred to Cymodoce by 
M.-Edwards, and I suppose it to be correct; it is probably 
an immature specimen of one of the Mediterranean species. 
Gourret has established two species from the Mediterranean 
of Dynamene, D. corallana, and D. setosa, but accord- 
ing to the shape of maxillipeds and abdominal notch, they 
are females of Cymodoce. I am acquainted with three 
European species, but the sum of these statements shows that 
it will be a most difficult task to name them correctly, and an 
attempt must be postponed. 
In the British Museum I saw besides typical specimens (or 
co-types) of the following species correctly established as 
forms of Cymodoce, viz. C. bifida (Leach), C. trilobata 
(Miers), C. longistylis (Miers), C. convexa (Miers), C. 
aculeata (Hasw.), C. coronata (Hasw.), andC. granulata 
(Miers). (The last-named form is similar to Cerceis tris- 
pinosa (Hasw.) in the shape of first joint of the antennule, 
surface of thorax and abdomen, shape of seventh thoracic 
epimera, which are produced and curved as a hook with the 
apex turning upwards, shape of the abdominal notch and 
uropoda, but it differs sharply from Cerceis trispinosa in 
the structure of plp.,‘ and certainly of plp.®: according to kind 
communication from Dr. W.T’. Calman—who at my request ex- 
amined several details of a male from Flinders Is].—the exp. 
of plp.* is sub-membranaceous, not plicated as in the named 
species of Cerceis, of which I have examined specimens 
from Port Victoria forwarded me by Dr. Chilton.) In the 
same Museum I saw the type of Spheroma spongiosum 
(White) and specimens of SpheromaGaimardii(M.-Edw.), 
both referred correctly to Cymodoce by Miers. Cymo- 
doce abyssorum (Bedd.) has with good reason been 
