L I T H D M U S. 



Spccios 12. (Mus. Cumiug.) 



I.TTHODOMUS GnuNERi. LUhod. testa arcuato-elongatd, 

 circa vmhones peculiariler angulato-gibbosd, aniice at- 

 lenuatd, inietue castaned, uniique ohlique Jlexiioso-exa- 

 ratd. 



Grlner's Lithodomus. Shell arcuately elongated, pe- 

 culiarly angularly gibbous about the umboes, atte- 

 nuated anterioily ; dark-chestnut, obliquely flexuously 

 furrowed throughout. 



Philippi, MS. in Mus. Cuming. 



Hab. New Zealand. 



This species, it will be seeu, is distinguished by a very 



remarkable shape. In other respects the characters are 



much of the ordinary type. 



Species 13. (Mus. Cumiug.) 



Lithodomus teres. LUhod. testa subcylindraced, parte 

 posticd dense perpeudiciilariler exaratd, anlicd lavigatd; 

 intense castaned. 



The slender Lithodomus. Shell somewhat cylindrical, 

 posterior part closely perpendicularly furrowed, ante- 

 rior smooth ; dark-che.stnut. 



Philippi, Abbild. und Bcsch. Conch, vol. ii. p. 14S. pi. 1. 

 f. 3. 



Hab. Mazatlan. 



Of simple form and sculpture, uniformly of small size. 



Species 14. (JMus. Cuming.) 



IjITHODOMUS coarct.\ta. Litliod. testa oblongo-ciinei- 

 fonni, midique perpmdicrdariter exaratd, posliee glo- 

 boso-cordiformi, gibbosd, deinde antice attenuato-coarc- 

 tatd, tersm extremitatem epidermide fibrosa barbatd. 



The contracted Lithodomus. Shell oblong wedge- 

 shaped, perpendicularly furrowed throughout, poste- 

 riorly globosely heart-shaped, gibbous, then anteriorly 

 attenuately contracted, bearded towards the extremity 

 with a fibrous epidermis. 



Folsella coarciaca, Dutiker. 



Hab. Gallapagos Islands ; Cuming. 



Eminently distinguislied by its wedge-shaped ./;w-like 



form, the posterior portion being prettily involuted like an 



Isocardia, the anterior attenuated and bearded with a 

 fibrous epidermis. 



Species 15. (Fig. a, b, Mus. Cuming.) 

 Lithodomus attenuatus. Lithod. testd cylindraced, 



tenui, postice globosd, tumidiusculd, deinde coarctatd 



et antice gradatim attenuatd, imdique lavigatd vet 



obsolete malleatd ; flavescente-olivaced. 

 The attenuated Lithodomus. Shell cylindrical, thin, 



posteriorly globose, then contracted and anteriorly 



gradually attenuated, smooth or obsoletely malleated 



throughout ; yellowish-olive. 

 Modiola attemiata, Deshayes, Anim. sans vert. vol. vii. 



p. 28. 

 Hab. Chili and Peru. 



A very characteristic species, of a yellowish-olive colour, 

 thin in substance, except when incrusted with calcareous 

 matter, as in Fig. 15 a, with no indication on its surface 

 of the perpendicular furrows frequent in this genus. 



Species 16. (Mus. Cuming.) 

 Lithodomus caudigerus. Lithod. testd cylindraced, 

 tenui, IcBvigatd, extremitate anticd appendicibim calca- 

 reis angnstatis subcaudatd ; rvfescente-castaned. 

 The tail-bearing Lithodomus. Shell cylindrical, 

 thin, smooth, anterior extremity tailed with nairow 

 calcareous appendages ; reddish-chestnut. 

 Lamarck, Anim. sans vert. vol. vii. p. 27. 

 Hab. West Indies. 



We need scarcely remark that the calcareous incrusta- 

 tion protruding beyond the anterior extremity of this shell 

 is no specific characterisfic. 



Species 17. (Mus. Cuming.) 

 Lithodomus castaneus. Lithod. testd cylindraced, tenui, 



imdique gibbosimculd et lavigdta ; castaned. 

 The chestnut Lithodomus. Shell cylindrical, thin, ra- 

 ther gibbous throughout and smooth ; chestnut. 

 DuNKEE, MS. in Mus. Cuming. 



Hab. ? 



Of extremely simple character, without any appearance 

 of furrowed sculpture. 



October, 1857. 



