SPECIES OP CAEBONIFEEOUS MUECHISONIA. 563 



which seems to have been overlooked, for it is not mentioned in any 

 of the lists of fossils published since. Though he notes the existence 

 of a band on the whorls, he does not observe its significance as indi- 

 cating the possession of a sinus in the outer lip. He refers it to the 

 Pyramidellidce, and considers it closely allied to the recent Cerithium 

 telescojoium, Brug. The sinus in the outer lip is clearly shown to 

 have been present by the lines of growth which curve backwards to 

 the band above and forwards again below, thus proving that the 

 shell is closely related to the Murchisonice. Of the sections into 

 which that genus has been divided, this species has most in common 

 with Coelocaulus, but it differs from it in its remarkably flattened, 

 grooved base and in the absence of an umbilicus. The mouth is im- 

 perfect in all the individuals I have seen, but from what is preserved 

 I think it is highly improbable that the columella was vertical or 

 the peristome reflected as in Coelocaulus. It might therefore be 

 well to retain the name Cerithioides for a section of Murchisonia 

 in which this species might be placed until more is known of its 

 afl&nities. 



Section Goniosteopha, (Ehlert. 



MUECHISONIA (GoNIOSTROPUA) HIBERIfICA, Sp. nOV. (PI. XYI. fig. 1.) 



Shell elongated, turreted. Whorls angular, increasing very 

 gradually, slightly concave both above and below the angle. Sinual 

 band bounded by two strong keels situated near the middle of the 

 body-whorl, and rather below it on the upper whorls. Ornamenta- 

 tion consisting of one keel a short distance below the band and 

 another above, immediately below the suture. Sutures deep. 

 Mouth unknown. Lines of growth not seen. 



There is but one specimen of this species in the collection of the 

 Geological Survey, Museum of Science and Art, Dublin. The apex is 

 broken and only six whorls remain. Its surface is badly preserved, 

 so that lines of growth indicating the possession of a sinus in the 

 outer lip are not perceptible. Nevertheless its characteristics are 

 sufficiently distinctive to warrant its being taken as the type of a 

 new species of Murchisonia. 



Length 12^ millim. ; width of body 5 millim. ; height 4 millim. 



Locality. Hook Point, Wexford. 



Formation. Lower part of the Mountain Limestone. 



Mtjechisonia (Goniosteopha) Tatei, sp. nov. (PI. XYI. fig. 2.) 



Shell elongated, turreted. Whorls angular, numerous, increasing 

 gradually. Sinual band bounded by two strong keels, situated 

 near the middle of the body-whorl, and rather below the middle of 

 the upper whorls. Ornamentation above the band variable, some 

 specimens having two slight keels on the upper part of the whorl 

 with one or two fine threads below, between the lower keel and the 

 band, and occasionally another thread above at the suture ; while 

 others have only two keels, the additional threads being absent. 

 Below the band are three keels somewhat less strong than those 



