96 MR JAMES COSMO MELVILL AND MR ROBERT STANDEN ON THE 



CATALOGUE OF THE MARINE MOLLUSCA OBTAINED IN 



A. REGIO ANTARCTICA, including Gough Island. 



B. ASCENSION ISLAND. 



C. SALDANHA BAY, SOUTH AFRICA. 



A. REGIO ANTARCTICA. 



Class GASTEROPODA. 



Order AMPHINEURA. 



Sub-order POLYPLACOPHORA. 



Callochiton illuminatus (Reeve). 



Chiton illuminatus, Reeve, Conch. Icon., tab. jcxii., fig. 147 (1847). 



C. (Callochiton) illuminatus, Smith, Proc. Zool. Soc. Lond., p. 35 (1881). 



Lepidopleurus illuminatug, Rochebrune, Mission, Cape Horn, p. 141. 



Callochiton illuminatus, Tryon and Pilsbry, Man. Conch., vol. xiv., p. 51, pi. ix., figs. 92-94. 



Hob. Trawl, Burdwood Bank, 56 fathoms, December 1, 1903; also Port William, 

 Falkland Islands, Station 118, January 1903. 



A small, pale reddish or fawn-coloured species, the surface microscopically radiately 

 striate and granulate, with the exception of the central arese, which are longitudin- 

 ally sulco-striate. The Port William examples are slightly larger and of a darker 

 fawn colour. 



Tonicia atrata (Sowb.). 



Cliiton atratus, Sowerby ; Charlesworth's Mar/. Nat. Hist., 1840, p. 294; Conch. Igustr., 

 figs. 57, 58. 



Reeve, Conch. Icon., tab. xvii., fig. 103. 



Tonicia atrata (Sowb.), H. and A. Adams, Gen. Rec. Moll., i., p. 474. 



Pilsbry, in Tryon's Man. Mull, xiv., p. 201, pi. xli., figs. 28-30. 



Hob. Shore, Cape Pembroke, Falkland Islands ; and also at Port Stanley, 

 1903-1904. 



A smooth, sometimes prettily banded or rayed species. Several very juvenile 

 examples from contiguous localities are of similar pattern, but we dare not attempt 

 their differentiation. 



Order PROSOBRANCHIATA. 



Sub-order DIOTOCARDIA. 

 Family Acmteidse. 



Acmsea ceciliana. Orbigny. 



Patella ceciliana, Orb., Voy. Amer. Merid., p. 482, tab. Ixxxi., figs. 4-6. 



Gay, Hist. Chili, viii., p. 260 (1854). 



A cmxa ceciliana (Orb.), Tryon, Man. Conch., xiii., p. 33, pi. xxxiv., figs. 14-21. 



(ROY. soc. EDIN. TRANS., VOL. XLVI., 126.) 



