Notes on the Ascidea Manhattensis. 83 



Y. — Notes on the Ascidea Manhattensis^ De Kay, and on the 

 Mammaria Manhattensis. 



By THEO. a. TELLKAMPF, M.D.ij 



Read May 2.3d, [1871. 



De Kay's description of the Ascidea Manhattensis* is such 

 that this species, the only simple Ascidian thus far known to 

 occur on the shore of Manhattan Island, could not be classified 

 as yet. He states, 1. c, " the orifices are surrounded by ten to 

 thirteen verrncose processes," while the branchial orifice is six- 

 lobed, the anal orifice four-lobed ; he calls the tubes distant, 

 which generally are approximate, and omits to state that the 

 muscular sac (mantle) is gelatinous, and that the branchial sac 

 is not plicated. " In the young," he says, " besides, the orifices 

 are both terminal," though they are commonly more or less 

 distant, even approximate, and more rarely terminal. 



Description : Corpore subgloboso, cinereo, sacculo gelatinoso, 

 subverrucoso, subpellucido ; tubis insequalibus modice distan- 

 tibus ; osculo sexlobato, orificio anali quatuorlobato. 



The orifices on very contractile tubes, the branchial is shorter 

 and wider than the anal tube. 



This species is to be referred accordingly to the Molgidm, and 

 I propose to name it Molgula Manhattensis. (Figs. 1, 2, 3.) 



I have found it on the west, south, and east shores of Man- 

 hattan Island, particularly in places protected against the cur- 

 rent of the water, attached to beams, boards, or rocks in Sandy 

 Hook Bay, and in the Nevesink River to sea-grass, to about five 

 feet below the surface of the water. 



In a floating bathing-house anchored near the Battery I 

 found the young, from one to three lines in diameter, earlier or 



* Nat. Hist, of the State of New York, Part V., p. 259. 



