IIYDROZOA AND CTENOPHORA. 
Ocel. 5 
secretion which enables the animal to attach itself. These cells may be 
called glandulo-muscular cells. 
31. Krukenberg, C. F. W. Ueber den Wassergehalt der Medusen. 
Zool. Anz. iii. p. 306. 
The percentage of water existing as a constituent of Medusoid tissues 
seems to be fairly constant, varying between 95*34 and 95*79 only. 
32. . Bemerkungen zu der Eimer’schen Ansicht iiber den Ortwechsel 
der Rippenquallen. Vergl. physiol. Stud. iii. pp. 147-150. 
Shows that Elmer’s explanation of the manner in which Beroe rises and 
sinks in the water is fallacious, and that poisoned Beroe sinks at once, its 
tissue being denser than the surrounding water. 
33. Der Schlag der Schwingpliittchen bei Beroe ovatus. L. c. 
pp. 1-22, woodcuts. 
34. . Ueber die Curare- und Strychninwirkungen au Turris digitalis, 
ud^quorea foi'skalea, und Carmarina hastata. L. c. pp. 124-146. 
The author has tried the action of various poisons on these lower 
organisms, and has succeeded in mapping out the principal nervous 
centres in Beroe, Ho finds, moreover, dilferonces presented in closely 
allied genera in their behaviour towards the poisons which our present 
knowledge of their anatomy is unable to explain. 
35. Lankester, E. Ray. On a new Jelly-Fish of the Order Tracho- 
medusae, living in Fresh-water. Nature, xxii. pp. 147 & 148, 190 & 
191, & 241 ; Zool. Anz. iii. p. 321. 
36. . Medusae and Hy droid Polyps living in Fresh- water. Q. J. 
Micr. Sci. xx. pp. 483-485. 
Quotes a letter from A. Agassiz, who states that near Boston there 
are certain Hydroids, Laomedea gigantea, Eucope diaphana, E. pyrU 
formis, and Ohelia commissurialis, which flourish where they are exposed 
alternately to nearly fresh and quite sa’t- water. He also finds hero 
Sarsia, Tiaropsis, and some Aurelice. This shows that the mere occurrence 
of Limnocodium in fresh-water is not so very remarkable. 
37. . On Limnocodium sowerhii, a new 2'racho medusa, inhabiting 
fresh-water. L, c. pp. 351-371, 2 pis. 
38. . Article Eydrozoa," in Encycloptedia Britanhica (9th ed.), xii. 
pp. 547-565, figs, 1-58. 
The author puts forward a classification of the group which, while it 
agrees in the main with that recently put forward by Haeckel (Zool. Rec, 
xvi. Coel. p. 4, and supra, No. 23), differs from it in certain important 
respects. The class Hydrozoa falls into two sub-classes : i., Scypho- 
medusae, and ii., Hydromedusae. The term Scyphomedusce is synonymous 
with Hoockel’s Acraspeda, the Inicernarians being now called by the 
latter Stauromedusae. The term Hydromedusae includes the four orders 
of Haeckel’s Craspedota, viz., Anthomedusae, Leptomedusce, Trachomedusa), 
and Narcomedusce, with Moseley’s order Hydro cor allinae, and the Siphono- 
pJiora. The terms Anthomedusae (Hck.) and Leptomedusce (Hck,), are 
advantageously compounded with Allman’s terms Gymnoblastea and 
