ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
351 
Lepidisis Verrilli , which must be a fine growth when complete, a mag- 
nificent Calyptropliora (C. Agassizii), Stachyodes ambigua, the richly 
branching Stenella ramosa, Amphilophis abietina, allied to A. regularis, 
Acantliogorgia brevispina , Psammogorgia variabilis , and Callisteplianus 
Wrightii. Some of the known forms, such as Pennatula phosphorea and 
TJmbellula eucrinus are inhabitants of the Atlantic. 
Hy droids of the Albatross.* * * § — Mr. S. F. Clarke has a report on the 
ten Hydroids collected by the ‘ Albatross ’ off the west coast of Central 
America. Obelia castellata sp. n. may, when its manner of reproduction 
is known, prove to be a Campanularia ; it has, however, many points of 
agreement with O. gelatinosa. Lictorella geniculata sp. n. has a very 
rigid, angulate habit. The new Halecium argentcum is allied to 
H. macrocephalum. Sertularia variabilis sp. n. sometimes has the stems 
monosiphonic throughout, while others are polysiphonic except at the 
extremities. 
Minute Anatomy of Limnocodium. f — Mr. R. T. Gunther makes 
some additions to our knowledge of the minute anatomy of this interest- 
ing freshwater Medusa. He finds that the descriptions of Allman and 
of Ray Lankester apply only to the younger and smaller tentacles, and 
that the older and larger are always hollow throughout their length ; in 
many sections the lumen of the tentacles was found to be directly 
continuous with the lumen of the ring-canal. Morphologically, then, the 
tentacles of Limnocodium are hollow tentacles, though it is quite possible 
that, under certain circumstances, they often contract to such an extent 
that the lumen vanishes ; indeed, at the bases of the ectodermal cells 
there is a powerful circular muscular coat. Lankester’s account of the 
velar sense-organs is confirmed in every particular. The author was 
able to make some observations on the development of the spermatozoa, 
and to prove the correctness of de Varenne’s statement that “ Dans toute 
la duree du developpement des spermatozoides, en prenant la cellule 
mere des son debut, le noyau n’a pas change.” 
With regard to the systematic position of this jelly-fish, Mr. Gunther 
remarks that it appears to be a case in which an increase of knowledge 
is correlated with an increase of difficulties ; to include Limnocodium 
in the Trachomedusac is to make that group more unnatural than it is 
at present ; it is perhaps best to say of it that|it is a Medusa descended 
from Leptomedusan ancestors which has developed sense-organs with an 
endodermal axis independently of the Trachomedusae. 
Freshwater Medusa from the Niger.J — M. J. de Guerne has a 
notice of a letter from Dr. Tautain, who reports that in January 1888, 
he found, near Bamakou, on the Niger, a freshwater Medusa of which 
he collected about 50 specimens ; these he unfortunately failed in success- 
fully preserving. The attention of better equipped travellers should be 
called to this statement. 
Perigonimus.§ — Messrs. H. L. Osborn and C. W. Hargitt describe a 
supposed new species of this Hydroid from Long Island, which they pro- 
* Bull. Mus. Comp. Zool., xxv. (1894) pp. 71-7 (5 pis ). 
t Quart. Journ. Micr. Sci., xxxv. (1894) pp. 539-50 (1 pi.). 
X Bull. Soc. Zool. France, xviii. (1893) pp. 225-30. 
§ Amer. Natural., xxviii. (1894) pp. 27-34 (12 figs.). 
