IREDALE: SYNOl'SES CONTENTS BRITISH MUSEUM. 307 



Monocoiidyla, 1840. 1847. Monocondtjlea. 



Myodora^ 1840, p. 136. 1840a, p. 140. "In the Lyonsm nncl 



Myadorce, the caitilago ])it is sunk into the liin<^e margin of 



each valve, and covered by a large flat hinge-piece; tlie shell 



of tlie former is thin and of the latter thick, with verj- uneqnal 



valves, tlie left one being flat." 

 Mysia, 1840. Appears twice on the same page (150), once in the 



Tellinidaj, and afterwards in the Lucinidse. 

 JSfeara, 1840. 1842, p. 78. " The JV<?«r« have a thin nearly equi- 



valve shell produced into a beak behind and with small hinge 



teeth." 

 Neciia, 1840. Not again mentioned, either in 1842 or in 1847. 

 Niomia, 1840. 1842, p. 60. '^ Nioma has a white spirally striated 



shell with a deeply perforated axis." 1847. Given as a synonym, 



with Ilerria, of Vanikoro. 

 Nisso, 1840. 1847. Ntso, llisso. 



Ncelia, 1840. Not again mentioned, either in 1842 or in 1847. 

 Notosiphonf, 1842. 1842, p. 88. " And in another [/MmM?'i!/W<g], 



tlie Nutosiphovc, [the syphon is] in the dorsal part of the septa 



of the alveolus. The alveolus is sometimes obliterated." 

 Odontostyliis, 1840. Not again mentioned, either in 1842 or in 1847. 

 Ophis, 1840. 1847. Opis, Defmnce, 1825. 

 OrtJiodoiiia, 1840. In 1847 fossil genera are not included, hence 



nothing further is given concerning this name. 

 Pectella, 1840. In 1847 included with a ? in front, and neither 



placed in synonymy nor type designated. 

 Peratoptera, 1840. Not again mentioned, either in 1842 or in 1847. 

 Pharus, 1840, p. 135. 1840a, p. 139. "In Solen and J^nsis the 



foot is club-shaped, and the tubes aj-e short and united. In 



Pharus the foot is long with a dilated end, and the syphons are 



elongate and separate." 

 Phraymolites, 1840. In 1847 nothing is mentioned of this, as the 



fossil genera are not included. 

 Plectronia, 1840. In 1847 nothing further is offeied, whilst the 



name itself is accompanied by a ?. 

 Polyodon, 1840. 1847. "i Polydonta, Montf. 

 Poiamia, 1840. 1847. ? Potamis. 

 Poteria, 1840. In 1847 neither type designated, nor placed in 



svnonymy. .-0-^ ' "t- "9 "^ - 



Puptllia, 1840, p. 114. 1840a, p. 117. "In PupiUia the shell is 



surrounded hy a sharp white edge." 

 Pyanodonte, 1840.' 1847. 'i Pycnodonta. 

 Pyraze, 1840. 1847. Pyraziis. 

 Radula, 1840. 1842, p. 60. "The genus Eadula is referred here 



provisionally until its animal is known; the shell is solid and 



Nerite-like, with a rounded inner lip, having a deep notch in its 



centre; the throat is somewhat striated." 

 Raleta, 1840. 1842, p. 78. "The Tomala are like tlie Corhda, but 



have a triangular projecting plate with a ridge on each side 



in the left valve, and two triangular teeth in the other, and 



