1809.] Descriptions of marine Gastropoda from Ceylon, Sfc. 163 



Though possessed of no very distinctive characteristics, there is no 

 species, I know of, with which the preceding can he confounded. 



Fissurella (?) Scrobiculata-N. s., Pi. XVII, Fig. 15. 



T. parva, depressa, fere regular -iter ovalis, lateraliter prope medium 

 paululum angustata, antice ac postice rotundata, alba, fasciis radian- 

 tibus hand distinctis fulvescentibus notata ; superficie omnina supra 

 minute scrobiculata, ac striis radiantibus subobsoletis ornata ; foramine 

 late ovato, sub-postico, margine elevato circumdato ; margine apertures 

 attenuato, minute creniolato ; superficie interna alba. 



Long. 9^ Mil.—Diam. 5f Mil— Alt. 2* Mil. 



Scarce, S. Prov. Ceylon. 



The sculpture of this interesting shell is very peculiar, the surface 

 being covered with rough, diamond-shaped scrobiculations, perhaps 

 caused by its being covered by the mantle of the animal, in which 

 case, this species will have to be removed to Macrochisma. 



Fissurella canalifera-N. S„ Pi. XVII, Fig. 13. 



T. ovato-elongata, antice angustata et ad terminationem retrorse 

 elevata, solidula, concentrice lamellose rugata et striis incsqualibus 

 radiantibus ornata, rufescenle pallida, nonnullis maculis elongatis ob- 

 scuris radiantibus notata ; foramine longo, sub-centrali, antice ac postice 

 rotundato ; superficie interna albida ; margine apertures obtusiusculo , 

 fere simplici, minute crenulato, antice insinuato ; margine foraminis 

 paulo incrassato, obtusiuseido. 



Long. 14 Mil.—Diam. 7J Mil— Alt. 4£ Mil. 



S. Prov. Ceylon. 



Easily distinguished from any other species of Fissurella, by the 

 curious way in which the shell, at the anterior end is turned up and 

 contracted, thus forming interiorly a sort of canal ; the black stripes 

 in position, also, seem tolerably constant, there being two broad ones 

 radiating from the posterior end of the foramen and the same number, 

 but narrower and more indistinct, from the anterior end. 



Macrochisma scutiformis— N. s., PL XVII, Fig. 14. 



T. ovato-elongata, lateraliter compressiuscula et paulo insinuata, mo- 

 derate elevata, solichda, striis radiantibus ac concentricis minutis ornata, 

 sordide albida, fasciis nonnullis radiantibus fuscis notata ; foramine longo, 

 excentrico fere tertiam partem diametri longitudinalis occupanti, postice 

 angustato ; margine apertures obtusiusculo, simplici ; margine forami- 

 nis intus incrassato. 



