On some Oriental Genera o/" Mygalomorphaa. 165 



transversis bi- vel tri-cingulatis (ultimo rapide accrcscento), trans- 

 versim obscure angulato-costatis, simul ac ad basin, circa umbili- 

 cum, et confertim (prfecipue circa anfractum ulfcimum) punctis 

 vel foveis interstitialibus regularibus transversim clathrato- 

 succinctis ; apertura rotunda, ochracea ; peristomate albo, con- 

 tinuo, simplici, parum rctlexo ; operculo paucispirali, normali. 

 Long. 17'50, lat, 15 mill. 



Hah. " S. Africa." 



This particularly interesting form seems uniformly to 

 differ from both the protean G. ligatum, Mlill., and all other 

 allies in the deep transverse interstitial pitting, espe- 

 cially conspicuous on tiie penultimate and last whorls, and 

 giving a character to the shell at first sight. We iiave 

 seen several specimens, all precisely similar in character, but 

 differing in marking, some being plain and ash-coloured, 

 without any transverse banding. That this banding is 

 present (though often obscured) in all specimens is, however, 

 evident by the markings showing through the ochraceous 

 interior ; the peristome is white, continuous, slightly reflexed. 

 The specimens we have seen have the ordinary normal oper- 

 culum of ligatum &c. 



We also give additional figures of Nataliaa ChapUni and 

 Dorcasia inhluzana^ supplementary to those in our last paper 

 (Ann. & Mag. Nat. Hist. ser. (3, vol. xiv., August 1894, 

 plate i.). 



EXPLANATION OF PLATf] XIL 



Figs. 1, 1 «. Zingis delicata. 



Figs. 2, 2 a. Trachycystis Alcocki. 



Fig. 3. Achatina ChurchiUiana. 



Fig. 4. Cyclostoma foveolidum. 



Fig. 4 a. Ditto, showing sculpture (enlarged). 



Figs. 6-5 6. Natalina ChapUni. 



Figs. 6, 6«. Dorcasia iiihluzana. 



XIX. — On a New and Natural Grouping of some of the 

 Oriental Genera o/' Mygalomorphfe, with Descriptions ofneio 

 Genera and Species. By R. 1. POCOCK. 



[Plate X.] 



The spiders which form the subject of the present paper have 

 been recently referred by Mons. E. Simon * to three distinct 



* Hist. Nat. des Araignees, i. pt. L pp- 132, 171. 

 Ann. & Mag. N. Hist. Ser. 6. Vol. xv. 12 



