118 MR JAMES COSMO MELVELL AND MR ROBERT STANDEN ON THE 



A very thin, milky- white, delicately papyraceous Amussium, the valves almost 

 equilateral, slightly unequal, auricles subequal, straight, finely sculptured ; the left valve 

 beautifully concentrically radiately striate, the striae very close and fine ; and the right 

 with finely cancellate upright striae, with quadrate interstices. Within, eacli valve 

 exhibits an equal number of strong lirations, say 18, whence the specific name. 



Family Limidse. 



Lima (Mantellum) goughensis, sp. n. (Plate, figs. 18, 18a). 



L. testa alba, mediocri, convexa, obliquata, ovato-oblonga, sequivalvi, superficie omni longitudinaliter et 

 regulariter multi-lirata, liris ad 48, interstitiis longitudinaliter sub lente per medium aequi- et unistriatis, 

 lineis concentricis incrementalibus spiraliter praedita, umbonibus incurvis, margine dorsali fere recto, area 

 ligamentari lata, centrali, pagina intus alba, longitudinaliter striatula, margine ventrali minutd serrulate. 



Alt. 10, lat. 7, diam. 8 mm. sp. maj. 



Hob. Trawl, 100 fathoms, Gough Island, April 23, 1904. 



A small species, if our specimens be adult. Although ordinary in form, with 

 valves very convex and trapezoidly oblique, yet the delicate and regular longitudinal 

 lirae, each with an accompanying single interstitial corresponding stria, seem 

 characteristic. 



Lima (Limatula) pygmsea, Philippi. 



Lima pygmxa, Philippi, Weigmann's Archivf. Naturyesch. (1845), p. 56. 



Limatula falklandica, A. Adams, Proc. Zool. Soc. Lond. (1863), p. 509. 



Radula (Limatula) pygmxa, Smith, Phil. Trans. Roy. Soc. (1879), vol. clxviii., p. 191. 



Lima (Limatula) pyymxa, Phil. ; Smith, Report " Challenger " Exp. : Zool., xiii., p. 292. 



Hob. Station 325. Dredged in Scotia Bay, South Orkneys, at 9-10 fathoms, April 

 1903; and again, South Orkneys, at 2-8 fathoms, December 1, 1903. Likewise in 

 Macdougal Bay, South Orkneys. 



Order EULAMELLIBRANCHIATA. 



Sub-order SUBMYTILACEA. 



Family Lucinidse. 



Cryptodon falklandicus, Smith. 



Cryptodon falklandicus, A. E. Smith, Rep. " Ghallenyer " Exp.: Zool., xiii., p. 190, pi. xiv., 

 figs. 3, 3a (1885). 



Hob. Scotia Bay, South Orkneys. Dredged at 9-10 fathoms, September 1903. 

 In every way agreeing with the type. One specimen only, but perfect. This 

 species has also occurred at Shallow Bay, Lively Island, Falklands * (Miss COBB). 



* J. of Cowh., ix., p. 105. 

 (ROY. soc. EDIN. TRANS., VOL. XLVI., 148.) 



