H 



W 



0-42 



0-42 



042 



0-40 



FROM WEST PAKISTAN 23 



males. Carapace subrectangular in lateral view. Dorsal margin sinuous with 

 protruding anterior and posterior cardinal angles ; ventral margin almost straight. 

 Anterior margin broadly and evenly rounded, posterior extremity rounded, postero- 

 dorsal margin very slightly concave, posteroventral margin curved in the male 

 dimorph but almost straight in the female. Valves more or less equal. Eye- 

 tubercle rounded and distinct. Surface ornamentation consists of coarse reticula- 

 tions with superimposed ridges radiating from the posterior of a well-developed 

 subcentral-tubercle. The ventral inflation culminates in a marked ventral ridge 

 almost parallel to the ventral marginal rim. There are two ridges which join the 

 eye-tubercle, one a short more or less vertical ridge bounded posteriorly by a deep 

 anterodorsal furrow which is better seen in dorsal view, and the other a high anterior 

 marginal rim which continues along the venter and around the posterior as a less high 

 rim. Anterior and posterior margins decorated with numerous very short and 

 delicate spines. 



Dimensions (mm). 



L 

 Io. 4317 Carapace male (holotype) 0-72 



Io. 4270 Carapace female 0-68 



Comparison. Alocopocythere transcendens sp. nov. shows some resemblance and 

 is perhaps ancestral to the present species ; but A. transcendens has a less well- 

 developed subcentral-tubercle without radial ridges and lacks a ventral inflation 

 ending in a ridge. Alocopocythere coarctata sp. nov. is much smaller, has a carapace 

 which tapers towards the posterior end and has a less deep surface reticulation. 



Genus " ANOMMATOCYTHERE " Sohn 



Type species. " Anommatocythere microreticulata " Sohn. 



Remarks. This is a new genus erected by Sohn whose paper is in press. The 

 two species described below are provisionally assigned to the genus but their final 

 designation will depend on the publication of Sohn's paper. 



" Anommatocythere " laqueata sp. nov. 

 (Plate 10, figs. 5-10) 



Derivation of name. Latin laqueatus, fluted ; with reference to the ornamenta- 

 tion of the anterior rim. 



Diagnosis. Anterior rim ornamented with seven small more or less rectangular 

 depressions. Carapace subtriangular with a gently convex dorsal margin. 



Holotype. Io. 4320, a female carapace (Plate 10, figs. 8-10). 



Paratype. Io. 4271. 



Material. 32 specimens from the locality below from three horizons (sample 

 nos. 3403, 3405 and 3466). Two specimens from the Zao River section from one 

 horizon (sample no. 24107). GSP BM 2521-2. 



