FAMILY SPHAHROMIDA. 118 
(3) Seen from above, the epistome protrudes as a broad but 
very short plate separating the antennule. ‘T'wo proximal 
joints of the antennule protrude as a narrow rim in front of 
the head. Fifth joint of maxillipeds short and broad, with a 
low lobe occupying nearly the whole interior (front) margin 
and reaching its distal end. Endp. of plp!. about three times 
as long as broad at the base. Exp. of plp.’ unjointed. Ter- 
minal margin of abdomen freely exposed, sub-truncate. 
(8) Cassidinidea (n. gen.). 
(y) Epistome very short, invisible from above. ‘Two proxi- 
mal joints of the antennule strongly expanded, forming a 
broad rim in front of the head; the inner margin of the 
expansion of one antennula touches that of the opposite 
antennula in the mesial line. Fifth joint of maxillipeds 
short, with a moderately developed lobe proceeding from 
the whole interior (front) margin. Endp. of plp.! exceedingly 
narrow, four times as long as broad. Exp. of plp.* two-jointed. 
Terminal margin of abdomen completely surrounded by the 
very long endopods of the uropods; the end turned some- 
what upwards, vaulted, with a longitudinal groove below, so 
that an aperture, visible from behind, is found between the 
margin of abdomen and the uropods. Body exceedingly 
flattened ; the two proximal joints of the antennule, both rami 
of urp. and the lateral parts of the thoracic segments and of 
the anterior section of abdomen are strongly expanded, and 
their margin constitutes a continuous outline with the fringe 
of ciliz very dense, regular, and conspicuous; head and last 
abdominal segment totally excluded from partaking in form- 
ing the outline of the animal. 
(9) Leptospheroma (Hilgendorf). 
The section Ancinini comprises three genera, one of which 
is founded on a new form described in the notes below. The 
diagnosis of the genus Ancinus (M.-Edw.) is incomplete from 
want of material. 
(a) Eyes conspicuous, dark. Antennulz inserted on the 
front end of the head, their two proximal joints rather broad, 
vot, 49, part 1.—NEW SERIES. 8 
