107 



Plankton-Exped. 2. Bd. K. e.) Mit 6 Taf., 2 Karten u. 3 Figg. im Text. 

 Kiel u. Leipzig, Lipsius & Tischer, 1893 [erh.März 1894]. gr. 4«. (101 p., 

 Litt. u. Taf.-Erkl. p. 102 — 107.) Einzeln: Ji 14, — , mit dem Ganzen 

 J^ 12,60. 



Trachylinae: Trachynema longiventris n. sp., Marmanema velatoides n. sp., 

 Rhopalonema striatum n. sp., Homoeoneina n. g. plati/goiion n. sp., H. militare n. 

 sp. ', Paiitachogon n.g. HaecJcelii n. sp. ; Liriope distanogona , compacta, minima, 

 hyperbolica nn.s]^Tp. Solmai-is multilob ata n.s\i. ; Pe g antha dactgletr a n.s'p.; Cunina 

 duplicatali, sp. ; Solmundella Henseiiii n. sp. — Leptolinae: Halopsis mega- 

 lotis n. sp. ; Ptychogena longigona n. sp. — Anthomedusen : Tiara prismatica 

 n. sp. Die systematische Aufzählung und Beschreibung enthält -vielfache Bemer- 

 kungen zur Systematik. In Bezug auf geographische Verbreitung stellt Verf. fest, 

 daß keine Craspedotenart, die sich nördlich vom Florida- und Golfstrom findet, 

 südlich desselben vorkommt. Er unterscheidet in dem durchfahrenen Gebiete 

 drei Districte: I. den nordischen (characteristische Hochseeform: Aglantha digi- 

 talis). IL den District des Sargasso-Meeres, Unterabtheilungen bietend und mit 

 dem Mittelmeer übereinstimmend , und III. den District der südlichen Strömun- 

 gen, Guinea- und Südaequatorialstrom. Tiefseemedusen giebt es nicht, es könn- 

 ten nur Polypomedusen sein. 



Vanhöffen, Ernst, Nachtrag zu den Akalephen der Plankton-Expedition, p. 29 

 — 30 [zu Ergebn. d. Plankton-Exp. 2. Bd. K. d.]. an: Maas, O,, Die 

 craspedoten Medusen der Plankton-Exp. (Ergebn. 2. Bd. K. c.) 

 Natisitiioc punctata KöU. und Pelagien. 



Dixon, A. Fraser, Note on the Mesenteries of Actinians. in: Quart. Journ. 

 Micr. Sc. Vol. 35. P. 4. p. 551 — 553. 



Respecting a figure of the mesenteries given in Forster's paper on Octineon 

 Lindahli (v. supra p. 18) the author states, that no conclusion ought to have been 

 drawn from it as regards the order of appearance of the mesenteries. 



Günther, K. T., Some Further Contributions to our knowledge of the Minute 

 Anatomy of Limnocodium. With 1 pi. in : Quart. Journ. Micr. Sc. Vol. 35. 

 P. 4. p. 539—548—550. 



Some corrections and additions to Lankest er' s description. The tentacles 

 are hollow through their whole length. The endodermal sense-organ occurs in 

 Limnocodium and in Limiiocnida. In the gonads ((5) the various stages of de- 

 velopment of spermatozoa were present. ^Limnocodium is a medusa descended 

 from Leptomedusan ancestors , which has developed sense-organs with an endo- 

 dermal axis independently of the Trachomedusae. 



14. Vermes. 



Morgan, T. H., The Development of Balanoglossus. W^ith 6 pis. in : Journ. of 

 Morphol. (Whitman), Vol. 9. No. 1. p. 1 — 86. 



During the earlier stages the Ternaria increases immensely in size. In the se- 

 cond phase a continuous decrease takes place ; no new organs are formed , while 

 the larva is decreasing. In the third period an increase takes place in all the or- 

 gans. The increase in length is due to a general interstitial growth, the elonga- 

 tion of the posterior metamere of the young worm is not due to apical growth. 

 The collar-pores and series of gill-openings arise from a pair of invaginations of 

 the ectoderm. The supporting-bars of the gill-slits agree with those of Amphio- 

 xus. The last metamere of Balanoglossus corresponds to a great number of meta- 

 meres of Amphioxus. All the five body-cavities of the larva of B. Kowalevskii 

 arise as enterocoels. In the New England Tornarla the origin of the proboscis 

 body-cavity is unknown. The collar-cavities arise each from a single proliferation 

 of endodermal cells , and the third pair of body-cavities arises as solid evagina- 

 tions from the endoderm. The origin of the first pair of body-cavities in the Ba- 

 hama Ternaria is unknown. The collar-cavities and the last pair of cavities have 

 a mesenchymatous origin , and come from many scattered cells united seconda- 

 rily. The proboscis-vesicle may have in all cases a mesenchymatous origin. The 

 nervous system of Ccphalodiscus represents a more primitive form than that of 

 Balanoglossus. It is an error to speak of the invaginated nerve-cord of Balano- 



