CONTENTS. Vil 
Page 
XLVIII. On Calcareous Hexactinellid Structure in the Devonian : 
Limestone; large Fossil Hydrozoic Coralla from the Chalk; and 
further Observations on the Replacement of Silex by Calcite. By 
iced CART REE Ecce ns a. tis 8 eae dan ot WA SiN Sore Swabian so 3 412 
On the Young Stages of some Osseous Fishes—Development of the 
Tail, by Mr. Al. Agassiz ; On Selaginopsis, Polyserias, and Peri; 
cladium, by M. C. Mereschkowsky; on a new Gorilla from 
Congo, by MM. Allix and Bouvier ; On the Rhizopoda of the 
Salt Lake of Szamosfalva, by Dr. Geta Entz; Note on the 
Locality and Synonyms of Sternotomis cornutor, Faby. (Coleo- 
ptera, Lamiid), by Charles O. Waterhouse; On the Genus 
faliphysema, by the Rev. A. M. Norman, M.A...,....... 419—424 
NUMBER VI. 
XLIX. On the Reticularian and Radiolarian Rhizopoda (Forami- 
nifera and Polycystina) of the North-Polar Expedition of 1875-76. 
By Henry B. Brapy, F.R.S. (Plates XX. & XXI,) .........46. 425 
L. Descriptions of new Species of Heterocera from Japan.— 
Part II. Geometrites. By Artuur G. Burirr, F.L.S., F.ZS., &e. 440 
LI. Notes on the Internal and External Structure of Paleozoic 
Crmnoids. By Cranins, WACHSMUTE « os) yisic exit cya: baa hs 453 
LI. Description of a remarkable new Form of Ophiuride from 
@oeyion) By Bn@ami al SMire, BAS oe. tag ceva pag hints sale’s 468 
LILI. Remarks on some new Alphei, with a Synopsis of the 
North-American Species. By W.N. LocKINGTON.............. 465 
LIV. Description of two Butterflies collected by Dr. Turner at 
Port Moresby, New Guinea. By Artuur G. ButiEr, F.LS. &e. . 480 
LY. On the Nauplius Stage of Prawns. By Dr. Frirz Mitre 481 
LVI. Notes ona Collection of Japanese Sea-Fishes. By Dr. A. 
EU EEPIRER RES easly at cho! a) g) scaiierts hss sstalate eabete Peal acre tected eae wat Gee eG 485 
New Book :—Thesaurus Devonico-Carboniferus: Flora and Fauna 
of the Devonian and Carboniferous Periods. By J. J. Braspy, 
RU Ec OCGe Garcia, duc s athe ghey ciskarain pale ccsie means) «ae Mea ss Moca 487 
On the Origin and Distribution of the Turbellaria of the deep Fauna 
of the Lake of Geneva, by M. Duplessis; Characters of a new 
Species of Dryops from Formosa (Coleoptera, Parnide), by 
Charles 0. Waterhouse; On the Organ called “ Dorsal Chord” 
in Amphioxus lanceolatus, by MM. J. Renaut and G. Duchamp ; 
On the Zoological Affinities of the Genus Mesites, by M. A. 
PASC ROALOR FM oeio hc ais soos bbe FBLC hee 35 ah PM eee ae 490—493 
