228 H. H. Godwin-Austen— Helicid8e/;'0wj Dafla Rills. [Dec. 



The following conclusions can be drawn : — 



1. Mr. Wood-Mason's collection proves again that the Eaniganj 

 group contains a Flora only. 



2. A comparison of this Series can be made only with corresjionding 

 Series and not with strata in Avhich marine animals are j)redominant. 



3. All the 2ilants brought by Mr. Wood-Mason show excellently the 

 mesozoic liahitus of the fossil flora as the illustrious Brongniart has esta- 

 blished it in his excellent paper, and especially in his ' Tableau des genres 

 des vegetnux foss. 



The paper, which is illustrated by eight plates, will be published in the 

 Journal Part II, No. 4, for the current year. 



3. On tlie Helicidse collected diiring the Expedition into tlie Dajla- 

 Hills, Assam. By Major H. H. Godwin- Afstek. 



The present list contains nearly all the species of Selicidce that were 

 obtained by the author during the expedition of 1874-75, a few species only 

 still remaining undetermined ; these will be worked out, and the novelties 

 amongst them described by Mr. G. Nevill from the series presented by the 

 author to the Indian Museum. 



The paper, which will a|)pear in the forthcoming number of the Jour- 

 nal, Part II, is illustrated by a coloured plate of the animals and their shells 

 from the author's own pencil. 



4. On the Development of the Antennce in the Pectinicorn Mantidse. 



By J. Wood-Mason, Esq. 

 (Abstract.) 

 The author shows that, down to the last change of skin but one, no dif- 

 ference is to be detected between the two sexes of Oongylus gongylodes either 

 in the form or in the proportionate length of the antennae, which in both 

 male and female are identically the same simple and setaceous structures, con- 

 sisting of two distinct basilar segments followed by a multitude of very 

 short and ill-defined flagellar ones ; but that shortly after this event these 

 appendages in the male commence to thicken throughout that portion of 

 their length Avhich in the perfect insect is bipectinated, so as eventually to 

 acquire a compressed spindle-shaped form ; that this thickening is the out- 

 ward manifestation of the growth going on beneath the outernaost layer of 

 chitinous membrane (last shin), which, at an early date, ^9«r^ j?«ss«* withthe 

 formation of the new antenna, tends to separate of£ from the rest, 

 and thereafter serves as a capsule or sheath wherein the two series 

 of pectinations are developed by a process of budding from the antennal 

 segments between the basal 5 and the apical 12 — 15 ; that as the pecti- 

 nations grow they press upon so as to distend the walls of the sheath, 



