Volume II. November, 1888. Number 2. 
JOURNAL 
OF 
MORPHOLOGY 
ON THE DEVELOPMENT OF MANICINA AREO- 
LATA. 
A thesis for the degree of Ph.D., accepted by the Board of University Studies of the Johns Hopkins 
University, May, 1888. 
HENRY V. WILSON, 
FELLOW OF THE JoHNS Hopkins UNIVERSITY. 
DurineG the spring of 1887 the Marine Laboratory of the 
Johns Hopkins University was stationed on the island of New 
’ Providence, Bahamas. As soon as possible after my arrival, 
March 10, I endeavored to find out what corals were breeding. 
Of half a dozen species examined only one was with eggs. This 
was the so-called Chenille stone, or Mantcina areolata, one of 
the commonest corals in the Bahama waters. The breeding 
continued to be very active until the middle of April, when it 
began to decline, coming to a close before the first of May. 
The coral is found in large numbers in water of easy wading 
depth, lying with its pedicel buried in the sand. It lives very 
well in small aquaria, if care be taken to change the water twice 
a day. In rearing the larve I was compelled to employ the 
same tedious method as Lucaze Duthiers: every morning and 
evening I transferred them, one or two at a time, by means of 
a pipette, to a dish of fresh water. When once the larve had 
become attached, the matter was simplified by transferring the 
entire dish to a bucket of fresh water. For preserving the 
larvze, Perenyi’s fluid proved the most generally useful reagent. 
Osmic acid specimens were also of very considerable value in 
elucidating special points. For the anatomy of the adult, abso- 
