SOWEEBY : NEW SHELLS FROM THE PERSIAN GULF. 161 



Sah. — Bay of Zaila. 



A prettily marked shell, in form somewhat like N. vihex, Say 

 (sub-genus Phrontis, H. and A. Ad.). 



4. DoNAx TowNSENDi, n.sp. PI. XII. rig. 23. 



Testa sub-tiigono oblonga, compi'essa, cuneata, valde inaequi- 

 lateralis, polita, obscurissime radiatim striata, luteo-fusca, fasciis 

 purpureis fuscisque irregulariter picta ; umboncs acuti ; margo 

 dorsalis anticus rectiusculus, declivis, posticus truncatus, angulo 

 postico obtusiusculo ; area postangulari, bipartita, dimidio radiatim 

 lirato, liris numerosis acutis hie illic clathrato, deinde laminis con- 

 centricis acutis laciniatis sculpta; pagina interna purpurea. Longit. 26, 

 alt. 15 '5 mm. 



Var. a. Intus extusque lutea, postice pallide purpureo tiucta. 



Hah. — Persian Gulf. 



This pretty species varies considerably in colour, the interior of 

 the type being dark purple ; some specimens are yellow within, and 

 some nearly white, but these nearly all have a tinge of purple at the 

 posterior end. The sculpture of the posterior area is rather peculiar, 

 half the space behind the angle having sharp radiating lirte, and the 

 other half concentric fringed laminae, which, however, in most 

 specimens more or less overlap the lii'se, producing here and there 

 a latticed sculpture. 



EXPLANATION OF PLATE XII. 



Fig. 1. Columbella (Amycla) planaxiformis. 



„" 2. ,, (Mitrella ?) pupa. 

 ,,3. ,, ,, semipicta. 



,, 4. ,, ,, veuulata. 



,, 5. ,, (Anachis) Siuensis. 



,, 6. Cingulina trisulcata. 



,, 7. Ceritliiopsis multilirata. 



,, 8. Eulimella tenuis. 



,, 9. Turboiiilla sinensis. 



,, 10. ,, tenuistiiata. 



,, 11. Odostoraia subcarinata. 



,, 12. Alaba Huugerfordi. 



„ 13. Eulima producta. 



,, 14. Eissoia (Alvania) subcancellata. 



,, 15. Eissoina illustiis. 



,, 16. Couthouyia acuta. 



,, 17. Adcorbis patula. 



,, 18. Minolia (Conotrochus) strigata. 



,, 19. Monilea rotundata. 



,, 20. Ancilla (Monoptygma) unidentata. 



,, 21. Psammobia simplex. 



„ 22. Tellina Hungerfordi. 



,, 23. Donax Townsendi. 



,, 24. Scbizodentalium plurifissuratum 



,, 25. Nassa Zailensis. 



,, 26. Cancellaria paucicostata. 



,, 27. Plesiotbyreus Newtoni. 



