CAVOLINIIDAE 277 



The genus Cleodora has bilobed fins and a small cephalic lobe. The pallial lateral 

 appendages are rudimentary. The shell is rhomboid in shape when viewed from above. 

 The present species owes its name to the distinct transverse furrows on the shell, of 

 which there is scarcely a trace in the nearly allied C. pyramidata (L.). Other differences 

 are that the fins are shorter and their edges usually undulated. The apron is larger. The 

 teeth are not serrated, the median tooth is narrower and the lateral teeth have broader 

 bases. The dorsal side of the shell has five longitudinal ribs of which the median is the 

 strongest. It extends into a point posteriorly and terminates in an oval swelling which 

 represents the embryo shell. The ventral side is not much swollen and a triangular- 

 shaped portion of the upper valve is visible above it. The anatomy of the Terra Nova 

 specimens has been described (Massy, 1920, figs. 3-6). 



Distribution. Antarctic to about 50° S in the Indian Ocean and 46° S in the Pacific 

 (Meisenheimer, 1905). From 5"^ S of New Zealand to far within the Antarctic Circle 

 (Massy, 1920). 



Cleodora pyramidata (L.), 1767. 



Hyalaea laiiceolata, Lesueur, 1913. 



Cleodora exacuta, Gould, 1852. 



Cleodora labiata, Sow. (in Reeve, Conch. Icom'ca), 1877. 



Cleodora lamartinieri, Rang (in d'Orb., Mollusques de Cuba), 1841. 



St. 81. 4-5 m. net, 650 (-0) m. : 18 specimens. 



St. 87. Young-fish trawl, 1000 (-0) m. : 21 specimens. 



St. 88. I m. net, horizontal, 3000-0 m. : ? i specimen. 



St. loi. 4-5 m. net, 1310-1410 m. : 2 specimens. 



St. 239. 4-5 m. net, 1050-1350 (-0) m. : ? 2 specimens. 



St. 288. I m. net, oblique, 73-0 m. : i specimen. 



The above specimens measured 5-12 mm. in length. The shells were in very poor 

 condition, but the specimen from St. 288 appeared to belong to var. lata, Boas. This 

 author (1886, p. 72) thus defines the distribution of var. lata: " Atlanterhavet fra c. 

 40° N Br. til henved 30° S Br. (Middelhavet), Indiske Ocean (fra dettes Nordgraense 

 til c. 24° S Br.), Kinesiske Hav, Vestlige Stille Hav ". Three of the hauls were made west 

 of Cape Town, and the remaining three were made to the north of Ascension Island, to 

 the north of Tristan da Cunha and to the north-west of the Falkland Islands. The species 

 is cosmopolitan in warm and temperate seas. 



Cleodora cuspidata, Bosc, 1802. 



Cleodora cuspidata, Quoy and Gaimard, 1833. 

 Cleodora Lessonii, Rang, 1830. 

 Cleodora cuspidata (Bosc), 1802. 



St. 78. Young-fish trawl, 1000 (-0) m. : i specimen. 



St. 81. 4-5 m. net, 650 (-0) m. : 8 specimens ; i m. net, 90 (-0) m. : 4 specimens. 



St. 87. Young-fish trawl, 1000 (-0) m. : 4 specimens. 



