21 



in llie lull Icn^lh willi cominciuMiig Iransveisi' |);uiili()ns IVoiii [hv IVct' margin 

 lowards Ihe basis so nuich as to render the margin [losleiiorly ci'enaled" (49. p. 228); 

 llie Unis described lamina appears similar to liial of (îaiypus Floridensis Bks. in 

 most leatnres, bul differs from all the species, examined by me, thereby Ihal 

 Ihe terminal spine is placed on a lower level than the lamina proper and as 

 far resembling the terminal spine in for ilist. Ideuroncas luininatus n. sp. (PI. I, 

 fig. 5 a, /). 



The lamina interior seems to be shaped alike in most species of the ('helifer- 

 inac Sim., and is always divided into a proximal plate-shaped and a distal serriili- 

 formed portion. The proximal division is a thin transparent plate, divided by 

 distinct transverse lines, which has the rounded margin adorned by slight incisions, 

 corresponding to these; this plate (ills the space between the gaping fingers, when 

 the antennae are closed, and is not placed on quite the same level, especially not 

 towards the extremity, where it has become distinctly narrower. Its marginal 

 portion is here suddenly and sharply folded towards the immovable linger and 

 then again away from it, and is at last terminally fused with the most proximal 

 of the denlaled lobes of the serruli-formed portion; tliis terminal part of the plate- 

 shaped membrane covers, when observed from below, the hinder margin of lliis 

 lobe, and is placed beneath or just in front of the first mentioned fold, not far 

 removed from the apparent end of the lamina proper (I'l. IV, ligs. 4 a-b). The 

 plate-shaped portion is followed by a variable number, but usually three dentated 

 lobes, which are placed oblicpiely to the main axis of the finger and with their 

 downwards directed portion the most distal; these lobes are placed so closely to 

 each other, that each covers the front margin of the preceding (more proximal) 

 with its own hinder, as easily observed, when the antenna is examined in a dorsal 

 view. The whole organ is terminated with a spine, which is serrated along the 

 inner margin and basally fused with the terminal lobe as well as with the finger 

 between the second and third marginal tooth (PI. IV, fig, 4 b, t). The number of 

 the dentated lobes as well as their armature vary in the species, and so they do to 

 a certain degree in the same species; Cbelifer Mortensenii n. sp. has 2 lobes in the 

 male and four in the female, Ch. Hirmanicus Thor. (Ç) has four (PI. IV, fig. 4 a) and 

 Ch. equester Wiih has six lobes in the males, hnl only live in the female (21. pi. VIII, 

 fig. 3 b, s). The length of the terminal spine as well as its armature is variable 

 and of some systematic importance; (.'/i. iiodosiis Schranck for inst. has a spine, 

 which is scarcely longer than broad and provided with three very long teeth, while 

 it in Ch. Birmanicus Thor. for inst. is very long and slender [)rovided with about 

 seven tiny teeth (PI. IV, fig. 4 b, /). The lamina interior of Pseudochiridium Thorellii 

 n. sp. (PI. IV, fig. 12 b) is shaped almost as in Chelifer Geof., but it has the three 

 dentated lobes more pointed and a rather short spine; this organ consists in Chiri- 

 dium museoruiii Leach of a well developed plate-shaped portion, one or two almost 

 obsolete, not dentated lobes and a distal short spine. 



The difference between the organ described, as it may be observed, if we 



