IIYDROZOA AND CTENOPHORA. 
CccL 4 
tentacles generally soft and flexible, all probably passing through a hydri- 
form phase, containing the two orders, Anthomedusce, gonads gastral, and 
Leptomediisce, gonads radial. 2. Trachylince ; Crasjpedotce, having ten- 
taculocysts with endodermal otolithic cells ; tentacles generally stiff and 
rigid ; no form yet known passing through a hydriform phase ; containing 
the two orders, Trachoinediisccy gonads radial, and Narcomedusce, gonads 
gastral (or in radial pocket-like outgrowths of branchial wall). Through- 
out the work the author shows that here, as among the calcareous 
sponges, it is ^impossible to say definitely what is a good species, the 
existence of such being incompatible with the doctrine of evolution. 
Haeckel describes 83 genera arid 148 species as new ; of the new species 
125 were named in his “ Prodromus.” 
The following table gives the relation of Gegenbauer’s families to 
Haeckel’s orders : — 
Oceanidce 
T/iaumaniidce 
Eucopidm 
JEqiioreidm 
G eryoniidoi 
Trachynemidai 
JEginidm 
18. Hartmann, R. Ueber einige Verhaltnisse der Organisation von 
Pleurohrachia pilcus. SB, nat. Fr. 1879, pp. 25 & 26. 
Hartmann points out two round, red, granular pigment-spots co-existing 
with the well developed auditory vesicle. He describes special ganglia at 
the oral pole giving nerves to the swimmiug-plates. 
19. Hertwig, O. Ueber die Musculatur der Coelenteraten. SB. Jen. 
Ges. 1879, pp. 142-146. 
The author distinguishes between the neuro-muscle cells as found in 
the ectoderm of Ilydra^ and the epithelio-musclo cells as found in the 
velum and sub-umbrella of Medusce^ and recognizes in the latter kind an 
intra-epithclial and a sub-epithelial form. 
20. Hertwig, R. Ueber die Geschlechtsorgane der Coelenteraten und 
ihre systematische Bedeutung. Tom. cit. pp. 116-121. [See Zool. 
Rec. XV. Ccel. p. 12.] 
21. Hyatt, A. Common Hydroids, Corals, and Echinoderms. (Forms 
No. V. of the Boston Society of Nat. Hist. Guides for Science 
Teacliing.) Boston : 1879, 12mo (32 pp.). 
The author reproduces a few of the well-known drawings of these 
forms, and fills up a small pamphlet with letterpress iutended to create 
in rchool children a love for the study of nature, 
22. Jentink, F. a. Ueber Trombley’s Umkehrungsversuch an Hydra, 
Tijdschr. Nederl. Uierk. Ver. iv. Versl. pp. li.-liii, 
[The Recorder has not seen this paper.] 
23. Kling, O. Ueber Craterolnphus lethys. Ein Beitrag zur Anatomie 
Anlhomediisai. 
. Leptorncdusai. 
. Trachomedusce. 
Narcomedusce. 
