Oil new Species o/* Pleurotomidai. 317 



Tliecia major to refer that species to the very genus to which 

 a more searching investigation proves it to belong. 



Localitif and Horizon. Louisville, Kentucky. Niagara 

 Group (Wenlock Limestone). 



Collection. British Museum (Natural History). 



EXPLANATION OF PLATE XI. 



Fig. 1. Chcpfetes cribrosa, Eicliw., sp. Surface enlarged, to show the 



eft'^cts of weathering. 

 Fi(j. 1 a. Tangential section, enlarged about tweuty-five times. 

 Fifj. 1 h. Longitudinal section, similarly enlarged. 

 Fi(/. 1 c. Enlargement of surface, after Eichwald, tab. xxvi. fig. 17 b. 

 Fig. \d. Section cut longitudinally, ibid. fig. 17 c. 

 Fig, 2. Favosites mnjor, Rom., sp. Tangential section, showing septal 



spines, enlarged about twenty-five times. 

 Fig. 2 a. Longitudinal section, similarly enlarged. 

 Fig. 2 b. Another portion of the same section as 2 a, showing the septal 



spines more distinctly. 



XXXIX. — Diagnoses of neio Species q/Tleurotomidfe /n the 

 British Museum. By Edgae A. Smith. 



The species of this family in many instances do not range 

 themselves satisfactorily in any of the numerous genera and 

 subgenera into which it has been subdivided. I have there- 

 fore, in publishing these descriptions, referred all, with tiie 

 exception of the species of Bela and Citharay which are fairly 

 distinguished, to the comprehensive genus Pleurotoma^ indi- 

 cating in brackets the section of the genus to which each 

 species appears to be most nearly related. 



Several of the species here described are from the Persian 

 Gulf and Jamaica, and these, I should add, were presented to 

 the Museum by one of its most liberal donors of specimens, 

 the late Robert McAndrew, Esq. Other diagnoses of species 

 of Pleurotomida3 have ab-eady been published in these 

 'Annals,' vide vol. xix. (1872), pp. 4^8-501, and voL x. 

 (1882), pp. 206-218, 296-306. 



Pleurotoma {Drillia) Portia, 



Testa fusiformis, paUide roseo-rufescens, circa medium aufractuum 

 zona lata alba ornata ; anfract. 8, convexi, primi duo laeves, se- 

 quentes duo granulati, caeteri costis teuuibus flexuosis 12-14: (in 

 anfr. ultima basim versus obsoletis) iiistructi, liris spiralibus o-Q 

 (in anfr. ultimo circiter 20) cancellati ; anfr. nltimus basi atte- 



Ann. (Sc Mag. N. Hist. Ser. 5. Vol. xiv. 25 



