120 J. W. Fewkes—Medusa from New England. ° 
NECTOPILEMA, gen. nov. 
Nectopilema Verrilli, sp. nov. 
Umbrella—The form of the bell and the relation of the 
height to the diameter could not be made out from the broken 
fragments.* From what is known of certain related genera, it 
is supposed that the diameter is about double the height.+ 
Exumbrella smooth. Gelatinous substance of the bell tough, 
thick at center, thinning out near the margin. There are eight 
sense organs, each of which lies in a broad deep incision in the 
bell-margin and is protected by a slightly developed hood. 
Each sense body probably lies in the radius of an oral arm. 
The lappets of the bell-margin are of two kinds, known as. 
the occular and velar marginal lappets. The velar lappets are 
divided into two kinds, those formed by shallow and those 
formed by deep marginal incisions. The eight pairs of lappets 
which lie one on each side of each marginal sense body will 
be known as the oceular lappets. The velar lappets{ with 
shallow incisions may be called the small velar lappets, and 
those with deep incisions, the large velar lappets. 
The occular lappets are short, stumpy and rounded, project- 
ing but slightly beyond the sense body, never extending to the 
periphery of the bell formed by the distal marginal tips of the 
velar lappets. The sense body has no marked conical pit or 
external ‘‘ Riechgriibchen.” 
The smaller velar lappets are formed by a slight incision in 
the compound lappets, which lie on each side of the occular 
lappets. When taken together they are much broader than 
the so-called large lappets, and singly their breadth is not 
much less than the large velar lappets. The incision, how- 
ever, which separates them from each other is less than that 
which separates them from the large velar lappets or the large 
velar lappets from each other. They are called the small velar 
lappets from the fact that the incision is so slight as compared 
with the incisions of the greater lappets. 'The compound base 
formed by the consolidation of two small lappets may be 
regarded as a single compound lappet. Hach small: velar 
lappet is triangular, pointed, thin, and flexible. 
The large velar lappets are two in number between each 
* The quadrant of the bell-margin represented in the figure is probably in- 
creased in size from the broken and therefore expanded condition. 
+ See Crambessa Tagi Heeck., Grenacher and Noll, Beitrage zur Anatomie und 
Systematik der Rhizostomeen, and Pilema (Rhizostoma, auct.) Heeckel, System 
der Acraspeden. In Stomolophus the relative height is more than one-half the 
diameter, and in Lychnorhiza it is less. 
{ The velar lappets are the marginal lappets between two pairs of occular 
lappets. An octant of the bell is therefore made up of two occular lappets, four 
small velar lappets and two large velar lappets. 
