830 
DE. J. S. BOWEEBAJfK ON THE ANATOMY 
Supplement to Part I. “ On the Anatomy and Physiology of the Spongiadce” hy J. S. 
Boweebank, LL.P., F.P.S., F.L.S. &c. — Descriptions of New Forms of Spicula 
that have been discovered since the publication of the First Part [Phil. Trans. 1858, 
p. 279). 
Eeceived November 29, 1862. 
Spicula of the Skeleton. 
Fakcimulo-cylindrical (Plate XXXVI. fig. 1). — This is the shortest and stoutest 
form of skeleton-spiculum I have yet seen. It forms the entire skeleton of Spongilla 
coralloides, Boweebank, MS. A new species from the Kiver Amazon. In the collection 
of the Boyal College of Surgeons of London. 
Inequi-aceeate veemiculoid (Plate XXXVI. fig. 2). — These spicula are found 
dispersed in great numbers in the basal membrane of Hymeraphia vermiculata, Bowee- 
bank, MS. A new species of British sponge from Shetland. No two of them agree 
in the form or amount of their contortions, but all of them are more or less inequi- 
acerate. 
Nodulated cyltndeical veemiculoid (Plate XXXVI. fig. 3). — The sponge whence 
this spiculum is derived has not yet been found. It occurs along with inequi-acerate 
vermiculoid and other well-known forms of sponge-spicula in the soundings from the 
Atlantic, in 2070 fathoms, and, like the last-named form, no two of them agree in the 
mode or amount of their contortions. 
Elongo-equiangulated teieadiate (Plate XXXVI. fig. 4).— -An auxiliary skeleton- 
spiculum from the surface of Grantia striatula, Boweebank, MS. From Madeira. The 
elongate ray is always disposed in accordance with the long axis of the sponge. 
Explected elongo-equiangulated teieadiate (Plate XXXVI. fig. 5). — From the 
surface near the base of Grantia striatula, Boweebank, MS. From Madeira. The 
elongated ray in this form, as well as the one represented by fig. 4, varies considerably 
in its proportions. 
Doliolate cylindeical (Plate XXXVI. fig. 6). — From a portion of the skeleton of a 
sponge nearly related to Ecionemia, Boweebank, MS. Locality unknown. 
Bifuecated expando-teenatb (Plate XXXVI. fig. 7). — From the same sponge as 
fig. 6 ; the shaft of the spiculum assisting in the formation of the skeleton, while the 
ternate terminations act as external defensive spicula. 
PoEEECTO-TEENATE (Plate XXXVI. fig. 8). — From the same sponge as fig. 6 ; the 
shaft belonging to the skeleton and the ternate apex acting as an external defensive 
spiculum. 
Exi’ando-teenate (Plate XXXVI. fig. 9). — From the same sponge as fig. 6 ; the 
