12 Spoiig, 
SPONQIIDA. 
(c) RMzomorina. 
Poritella, p. 27. Based on P. decidua^ sp. n., id. 1. c. Has the super- 
ficial habit of Chonelluj Zittel, and agrees in the general characters of 
its spicules and their connections with Platychonia, Zittel. Various 
localities in Gulf of Mexico, 100-805 fath. 
Sulcastrella, p. 27. Based on S. clausa, sp. n., id. 1. c. pis. i. fig. 5, 
ii. fig. 6, iii. fig. 7. Has the outward appearance of Astroholia,7A.iiQ\, but 
its stellate grooves lead into large oscula. Sand Key, 129 fath. 
Amphibleptula, p. 28. Based on A. madrepora, sp. n., id. 1. c. pis. i. 
fig. 6, iii. fig. 7 a. Appears connected with Potnelia, Zittel ; also resembles 
Stichophyma, Pomel. Barbadoes, 100 fath., near Havannah, 292 fath. 
Biphonidium, p. 28. Based on Liodermatium ramosum, Sdt. 
Scleritodcrma, p. 28. Based on B. packardi^ id. 1. c. pi, ii. fig. 3, Gulf 
of Mexico. Provisionally established. 
Aciculiles, p. 29. Based on A, higginsi, id. 1. c. pi. ii. figs. 1 m-s, 4 a-d, 
& 13, latitude of Havannah, 100 fath. Perhaps connected with Azorica 
pfeiffercd. 
Gastrophanella, p. 29. Based on G. implexa, id. 1 . c. pis. i. fig. 7, iii. 
fig. 8. Lat. 26^ 23' N., long. 83^ 31' W., 107 fath. ; 22° 9'N. 82'’ 20' W., 
127 fath. Connected with Bcytalia, Zittel. 
Betidiunif p. 30. Based on B. obtectum, id. 1. c. pis. i. fig. 9, ii. fig. 14, 
Near Havannah, 128-240 fath. Spicules very intimately united, cannot 
be isolated. 
Tremaulidium, p. 31. Based on T. geminum, id. 1. c. pis. ii. figs. 1 a-l, 
2, iv. figs. 1 & 2. Lat. 25° 33' N., long. 83° P W., 131 fath. 
Collectella, O. Schmidt, Zool. Anz. ii. p. 379. Based on C. avita, id. 
1. c., Lithistid. Contains forked-anchor spicules as well as discoderm 
discs ; the former are developed from quadriradiate spicules, the latter 
are forms specially modified to suit their position at the surface. 
Hexactinellida. 
IJyalocaulus, Marshall & Meyer, (6) p. 264. Pedicillate ; skeleton 
network continuous, meshes roundish, composed of 6-radiate spicules. 
Openings chiefly confined to upper surface. Free spicules uni-axial, also 
has spined 6-radiates. H. simplex, iid. 1. c. pi. xxv. figs. 1-5, on Euplec- 
off Cebu, Philippines. 
Myliusia zitteli, Marshall & Meyer, (6) p. 266, pi. xxv. figs. 10-17. 
Poly zoic. Development of lantern spicules traced ; their trabeculae are 
formed by the fusion of outgrowing spines. Off Cebu, Philippines. 
Aulodictyon{^-um~\ costiferum, Marshall & Meyer, (6) p. 270. Apparently 
near Farrea valida, Bowerbank. Off Cebu, Philippines. A. intermedium, 
iid. 1 . c. p. 270, pi. xxv. figs. 6-9. Contains long spined uni -axial spicules. 
Ai^atomy and Physiology. 
F. M. Balfour, Q. J. Micr. Soc. xix. p. 103, commenting on the most 
recent investigations as to the morphology and systematic position of the 
Sponges, considers that the stage of the larva of Bycandra and of many 
other Sponges, in which one half consists of amceboid granular cells and 
the other of clear ciliated cells, may be a transitional form between 
