ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
201 
granularis. They are products of the nuclear substance, and possibly 
become pigment-granules. 
Ccelentera. 
American Fresh-water Jelly-fish.* * * § — Mr. E. Potts has observed the 
budding and separation of free-swimming Meduste from Microhydra 
ryderi. The jelly-fish was about 1/32 in. in diameter, of a somewhat 
prolate dome-shape, with a quadrate manubrium, four radial canals, and 
.eight tentacles. The author found Microhydra ryderi among colonies 
of Bryozoa, on stones collected from the rocky bed of Tacony Creek, 
ti rapidly flowing mill-stream near Philadelphia, Pennsylvania, a small 
affluent of the river Delaware, but far above tide-level. He observed the 
Medusoids in a tank in August. Details are promised. 
Notes on Cubomedusse.y — Mr. F. S. Conant found in Kingston 
Harbour, Jamaica, two very abundant Cubomedusm — C/iaryhdea xayma- 
xana sp. n. and Tripedalia cys'ophora sp. n. — the latter requiring a new 
family Tripedalidae between Charybdeidae and Chirodropidae, the two 
families hitherto recognised. After a description of the two new species 
und some notes on their unusual occurrence in shallow water, this prelimi- 
nary communication contains an account of the eye and the otolithic sac. 
The occurrence of a free unsuspended otolith in a ciliated sac is probably 
unique among Medusae. The mature eggs of Tripedalia pass from the 
ovaries into the stomach-pouches, and there develop up to the stage of 
free- swimming planulae. The young are set free from the parent as 
-ciliated planulae, with posterior pigment-spots : they swim about on the 
surface for a day or two ; they gradually lose their forward motion and 
2 ’otate on their own axis in one spot. At this point they settle down, the 
pigment-spots migrate into the interior, tentacles are budded out, and in 
this condition they lived in the aquaria for three weeks without further 
development. Search for scyphistomas in the region where the jelly-fish 
were found was fruitless. 
Irish Hydroids.J — Mr. J. E. Duerden gives a list of the Hydroids of 
the Irish Coast, including 101 species, — 35 Athecata, and 66 Thecata. 
His examinations made an addition of about 23 species to the Irish 
Hydroids, including two new species, and one new to Britain. 
Distribution of Millepora.§ — Prof. S. J. Hickson notes the absence 
of evidence that Millepora existed further back in history than what 
may be called geologically recent times, and the consequent difficulty of 
accounting for its present wide distribution in the West Indies, Red 
Sea, Indian Ocean, and the Pacific. 
Tubularia indivisa. || — Gosta Gronberg describes the structure of the 
hydranth-head and the stalk of Tubularia indivisa, amplifying, and in 
some particulars correcting Allman’s description. The “ pendulous 
lobes ” of the endoderm described by Allman are probably the “ tseniolae.” 
A specific peculiarity is found in minute endodermic canals in the oral 
* Amer. Naturalist, 1897, pp. 1032-5. 
f Jolins Hopkins Univ. Circ., 1897, pp. 8-10 (2 figs.); Ann. Nat. Hist., i. 
7th series, 1898, pp. 31-40 (2 figs.). 
X Proc. R. Dublin Soc., viii. (1897) pp. 405-20. 
§ Zool. Anzeig., xxi. (1898) pp. 70-1. 
.11 Zool. Jahrb., xi. (1897) pp. 61-76 (2 pis.). 
