On some Oriental Genera 0/ Mygalomorpluc. 165 



trnnsvci'sis bi- vel tri-eingulatis (ultimo rapide accroscento), trans- 

 versim obscure !m}i;iibvto-f;ostiitis, simul ac ad basin, circa umltili- 

 cuiu, ct coiitertiiu (pra'cipue circa aiifractuni ultimuni) ])uncti3 

 vol fovois intorstiriMlil)Us rcf^ularibus trans%-ersim clathrato- 

 succinctis; apertura rotunda, ochracea ; peristoinato albo, coii- 

 tinuo, siinplici, jjarura rolloxo ; operculo paucispirali, uonnali. 

 Louf,'. 17"o(t, lat. 15 mill. 



]Iab. " S. Africa." 



This particularly interesting form seems uniformly to 

 (lifter from both the protean C. lujatnm, Miill., and all other 

 allies in the deep transverse interstitial j)itting, espe- 

 cially conspicuous on the penultimate and last whorls, and 

 giving a character to the siiell at first siglit. We have 

 seen several specimens, all precisely similar in character, but 

 diff*ering 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 maikiTigs showing tlnougli the ochraceous 

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

 The sj)eciniens we have seen have the ordinary normal oper- 

 culum of liyatuin &c. 



We also give additional figures of Natalina ChapUai and 

 Dorcasia in/iluzana, sujiplomentary to those in our last paper 

 (Ann. ct Mag. >'at. Hist. ser. G, vol. xiv., August 1894, 

 plate i.). 



EXPLANATION OF PLATE XIL 



Fi'ffS. 1, 1 rt. Zinyis delicata. 



Fiys. 2, '2 a. Trac/ii/ci/sfi.'s Alcocki. 



Fitj. 3. Achalina Church t'/lidiia. 



Fii/. 4. t'l/clvstotiKifovcoldfuin. 



Fitj. A a. Ditto, sliowinir •sculpture (oiilari^^ed). 



Fiys. o--') b. yutdliiia t'haplini. 



Fiys. (3, 6 a. Dorcasia iiihluzana. 



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

 Oriental Genera o/"Mygalumorpha2, with Descriptions ofneio 

 Genera and Species. By R. 1. POCOCK. 



[riuio X.] 



The spiders which form the subject of the present paper have 

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



« Hist. Nut. de3 Arai<?n^es, i. pt. 1, pp. 13i', 174. 

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



