32 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Mouth, as long as the last whorl, which latter is slightly inflated, 

 columella slightly twisted and reflexed, forming a fold, with a slight 

 ' chink ' in the umbilical region. Alt. 2, diam. max. I'l mm. 



"Porcupine" Expedition, 1870, Station 17. 



The species is noteworthy for its depressed and channelled spire ; 

 one specimen, broken, is considerably larger than the type. Compared 

 with R. obesa (Jeffreys) from equally deep water off Spain and 

 Morocco, the present form may be distinguished by its narrower 

 body-whorl. 



Eetusa. (Cylichnina) nitidula (Loven). 



Cylichia nitidula, Loven : Ind. Moll. Skand., p. 10 ; Of v. Kon. Yet. 



Ak. Forh., vol. iii (1846), p. 142. 

 Utriculus nitidulus, Loven : Sars, Moll. Reg, Arct. Norveg., p. 286, 



pi. xvii, fig. 13; pi. xxvi, fig. 3. 

 Retusa nitidula, Loven : Pilsbry, Man. Conch., vol. xv, p. 212. 



"Porcupine" Expedition, 1869, Dingle Bay, 18 (live), 18« (live) ; 

 1870, Stations 2, 9, 17, 35, 50, 53, 56; Vigo"^Bay ; Adventure Bank, 

 92 fathoms. 



Distribution. — Norway and Sweden, and the Atlantic coast of 

 Europe, south to the Mediterranean; Madeira (Watson). Pliocene 

 of Sicily, Calabria, and Ficarazzi ; Post-Pliocene of Belfast and 

 Christiania. 



It has been recorded from the American coasts by Miss Bush (Hep. 

 Comm. Fisheries, 1883, p. 714) amongst the molluscs dredged by the 

 "Fish-Hawk" in 155-487 fathoms. JeHreys notes that this is not 

 Bulla nitidula of Dillwyn from Solander's MS., and that the figures 

 of the present species and of R. nmbilicata on plate xcii of the " British 

 Conchology " have accidentally had the numbers transposed, 



Retusa obtusa (Montagu). 



Bulla obtusa, Montagu : Test. Brit., vol. i, p. 223, pi. vii, fig. 3. 

 Retusa obtusa, Montagu: Pilsbry, Man. Conch., vol. xv, p. 214, 



"Porcupine" Expedition, 1870, Stations 24, 50; Adventure Bank, 

 92 fathoms. 



Distribution. — European seas from Godhavn, Greenland, to the 

 Mediterranean (Pilsbry). Pliocene of Europe. 



Some of the specimens from " Adventure Bank " belong to the form 

 lajonkaireana, which name Mr. Pilsbry states, in his very careful notes, 

 must give place to that of turrita, Moller. 



Retusa toknata (Watson). 



Utriculus tornatus, Watson : Journ. Linn. Soc, ZooL, vol. xvii, p, 335 ; 



Challenger Rep., Gastropoda, p. 651, pi. xlviii, fig. 10. 

 Retusa tornata, Watson : Pilsbry, Man. Conch., vol. xv, p. 209, 



"Porcupine" Expedition, 1870, Yigo Bay; Adventure Bank, 

 92 fathoms. 



Distribution. — Madeira, dredged (Watson) ; Tenerife, 78 fathoms 

 (Watson). 



