206. Mr. W. H. Benson on the Characters 



the only specimen forwarded. I conclude, however, that it is 

 flat and horny, as in Cyclophorus. 



The operculum of Ft. tenuilahiatus, Metcalfe, has been re- 

 garded as Choanopomatous, but I consider it to be merely a mo- 

 dified flatter form of the Pterocycloid operculum, nearly agreeing 

 with that of its ally Pt. hispidus, Pearson, possessing a shelly 

 skeleton, concave on the inner side, and with the spiral edges of 

 the volutions on the outer side raised and free. 



Cyclophorus ? tomotrema, Bens., n. s. 



Testa anguste umbllicata, turbinato-pyramidali, radiato-striatula, liris 

 elevatis spiralibus plurimis, nonnuUis majoribus, munita, fusco- 

 coriiea ; spira conica, apice obtusiusculo albido, sutura bene iiu- 

 pressa ; anfractibus 5 convexis, ultimo subcarinato ; apertura 

 oblitpia, subcirculari, livida, supra angulata ; peristoniate duplici, 

 interiori coutinuo, expansiusculo, superne ad angulum incise, ex^- 

 teriori expanse, dilatato. Operc. 1 



Diam. 5 1, axis 5 mill. 



Hah. ad Teria Ghat, rare. Teste W. Theobald. 



C. ? scissimurgo, B., of Tenasserim belongs to the same group 

 as this shell. The incision is at the upper end of the parietal 

 margin. 



Cyclophorus cryptomphalus, Bens., n. s. 



Testa umbilicata, glebeso-deprcssa, solida, oblique striatula, striis 

 obsoletis confertis decussata, albida, superne rufb-castauea albide- 

 fulgurata, fascia lata mediana albida et infra altera lata castanea 

 cincta ; spira turbinata, apice acutiuscule, sutura submargiiiata, 

 anfractibus .5 ceuvexis, ultimo retundate, subtus valde convexe ; 

 apertura subebliqua circulari, albida ; peristemate duplici breviter 

 adnato, interne vix porrecto, expansiusculo, externo incrassato, 

 reflexo, supra umbilicum angustiusculum subobtectum late auricu- 

 lato-expanse. Operc. ? 



Diam. major 40, minor 32, axis 25 mill. 



Hab. in regione Ava regni Buriiianorum. 



Collected by Mr. Oldham, Chief of the Geological Survey of 

 India. The only specimen received is in very bad condition in 

 respect to surface. It is allied to Cycl. volvulus, Miill., but is 

 distinguished by its more depressed form, and by the auriculate 

 process covering the umbilicus, as in some of the Philippine 

 Cyclophori. 



Cyclophorus Theobaldianus, Bens., n. s. 



Testa mediecriter umbilicata, turbinato-depressa, solidiuscula, lineis 

 filiformibus elevatis flexuesis spiralibus. striisque obliquis clathrate- 

 decussata, subtus Isevieri, castanee-fusca, superne strigis albidis 

 interruptis picta, subtus area lata pallida, fascia angusta albida 



