10 NEW-YORK FAUNA — MOLLUSCA. 
EouipIA DIVERSA. 
PLATE V. FIG. 97. 
E. diversa. Couruovy, Bost. Jour. Nat. Hist. Vol. 2, p. 187, pl. 4, fig. 14. 
Description. Body elongated, acute behind. Head distinct, sub-orbicular, depressed, with 
two long slender lateral tentacula arising from near its junction with the neck ; two round and 
smooth shorter ones on the back of the head, a little behind the others. Eyes minute, just 
behind the latter pair. Branchial cirri disposed in a double series along the back. Sexual 
orifice large, just behind the neck on the right side ; vent a short distance behind and below 
it. Foot divided at its origin, forming two processes. 
Color. Semitransparent pale yellow, tinged with red. Branchial cirri internally orange. 
Length, 1°2. Breadth, 0°35. 
Found near the roots of Lancinaria saccharina, on the coast of Massachusetts. 
Eo.ipiA GYMNOTA. 
PLATE V. FIG, 95. —(CABINET OF THE LYCEUM.) 
Eolis ( Tergipes) gymnota. CouTHouy, Bost, Journ. Vol. 2. p. 69, pl. 1, fig. 3. 
Description. Body elongated, slender, tapering gradually to the tail. N eck very distinct. 
Head short, depressed, orbicular, perpendicularly linear. 'Tentacula four: the lower pair 
round, smooth on the front of the head, and an eighth of an inch long; the other pair rather 
shorter, serrated, and on the back of the head. Gills disposed in seven remote clusters along 
the sides ; the medial longest. Back witha central elevation. Sexual organs on the right 
side, below the first group of branchie, Vent on the same side, higher up, and between the 
third and fourth group of branchiz. 
Color of the gills reddish brown. Foot transparent. 
Length, 0:9. 
The animals of this section are very varied in form, and our acquaintance with them is 
but of modern date. I place provisionally here an inhabitant of our salt water which I have 
nowhere seen described, and which was sent to me under the name of Aquatic larva, from 
the Hudson river, a short distance above the city. 
