NO. 1205. SYNOPSIS OF THE X.tTADES SIMP SOX. 905 



(Group of Mutela rostrata.) 



Shell somewhat inflated, thin, elongated, with a low, rounded poste- 

 rior ridge ending in a point about midway up from the base; beaks 

 low, smooth; epidermis bluish green, rayless; hinge line edentulous or 

 having only the faintest vestiges of denticles; muscle scars large, 

 shallow, indistinct; nacre bluish, shaded violet. 



Animal the same as in typical Mutela. 



f MUTELA ROSTRATA Rang. 



*Iridina rostrata RANG, Nouv. Ann. Mns., 1835, p. 316. * POTIEX; and MICHAUD, 



Gall. Moll., 1844, p. 147, pi. LVI, fig. 1. 

 "Spatha rostrata VON MARTENS, Mai. Bl., XIII, 1866, p. 11. 

 "Mutela rostrata JICKELI, Faun., 1874, p. 269. * WESTERLUND, Faun. Pal., II, Pt. 



7, 1890, p. 312.* P^TEL, Conch. Sam., Ill, 1890, p. 187. 

 *Mutelina rostrata BOURGUIGNAT, Bull. Soc. Zool. de Fr., II, 1886, p. 488. 

 *Iridina coclestis LEA, Syn., 1836, p. 57 ; * Tr. Am. Phil. Soc., VI, 1838, p. 82, pi. xxn, 



fig. 70; *Obs., II, 1838, p. 82, pi. xxn, fig. 70.* TROSCHEL, Arch, fiir Nat., V, 



1839, Pt. 2, p. 239.* HANLEY, Biv. Shells, 1843, p. 225.* CATLOW and REEVE, 



Conch. Nom., 1845, p. 68. * TROSCHEL, Arch, ftir Nat., XIII, 1847, I, p. 273. 



* SOWERBY, Conch. Icon., XVI, 1868, pi. n, fig. 3. 



*Platir\s (Spatha) ccclestis LEA, Syn., 1838, p. 33 ; 1852, p. 55 ; 1870, p. 89. 

 *Mutela cocleatis H. and A. ADAMS, Gen. Rec. Moll., II, 1857, p. 506. *CLESSIN, 



Conch. Cab. Ano., 1876, p. 193, pi. xxv, figs. 1, 2. *RETEL, Conch. Sam., 



Ill, 1890, p. 187. 



Tropical Africa. 



Subgenus PSEUDOMTTTELA Simpson, 1900. 

 (Type, Mycetopus j)licatus Sowerby. 1 ) 



Shell rather thin, elongate, wide, round and gaping behind, cut away 

 and gaping at the anterior base; beaks low; surface rudely sulcate; a 

 series of irregular nodulous projections extends down the low posterior 

 ridge; hinge edentulous, with a kind of faint, broken internal ligament, 

 with a wide prismatic streak behind; muscle scars distinct, united, the 

 anterior protractor, however, separated and irregular; nacre lurid 

 violet, iridescent behind. 



t MUTELA PLICATA Sowerby. 



* Mycetopus plicatus SOWERBY, Conch. Icon., XVI, 1868, pi. n, fig. 3; Icon. XVI, 



1868, pi. ii. fig. 3. f FISCIIEU, .11. de Conch., XXXVIII, 1890, p. 8. * P.ETEL, 

 Conch. Sam., Ill, 1890, p. 187. 



* Platiris (Mycetopns) plicatus LEA, Syn., 1870, p. 90. 



* Mutela plicata JICKELI, Faun. Moll. N. Ost-Af., 1874, p. 270. 



Locality unknown, but Africa, no doubt. Sowerby credits it to 

 Gray's manuscript in the British Museum. 



1 This is certainly not a Mycetopoda, but is evidently nearer Mutela than anything. 

 I have placed it in that group as a subgenus, though it may be worthy of generic 

 rank. 



