28o DISCOVERY REPORTS 



St. 71. Young-fish trawl, 2000 (-0) m. : i specimen. 

 25° 47' 00" S, 14° 48' 00" W, hand-net : 2 specimens. 



The specimen taken north-east of the Falkland Islands measures 12 mm. in length. 

 Boas mentions that the largest he had seen measured 8 mm. 



The subgenus Hyalocylix is chiefly distinguished from Cleodora by having no 

 cephalic lobe. The tentacles are very unequal, the left being almost absent. The shell is 

 hornshaped and fluted transversely and is slightly curved in the dorsal direction. The 

 embryo shell is thimble-shaped, and as the animal grows this portion is separated by a 

 partition and it breaks oiT eventually so that adult shells are always blunt posteriorly. 



Distribution. Although never abundant in large shoals, this is widely distributed in 

 all tropical and sub-tropical seas. 



Subgenus Styliola, Lesueur, 1825 



Cleodora (Styliola) subula (Quoy and Gaimard), 1827. 



Cleodora (Creseis) spinifera, Rang, 1828; Sow., 1877. 

 Hyalaea subula, d'Orb., 1836. 

 Cleodora suhulata, Souleyet, 1852. 



St. 80. 2 m. net, 30-0 m. : i specimen. 



St. 87. Young-fish trawl, 1000 (-0) m. : 3 specimens. 



St. 89. Young-fish trawl, 1000 (-0) m. : i specimen. 



St. 287. Young-fish trawl, 800-1000 (-0) m. : } 2 specimens. 



Three of these hauls were made oflF the African coast from the Gulf of Guinea to Cape 

 Town. A single specimen was taken north of Tristan da Cunha. The largest examples 

 were 10-12 mm. in length. This is a warm-water species, but it apparently avoids the 

 very warm water at the equator. In this subgenus the animal has a very distinct 

 cephalic lobe. The shell is horn-shaped and easily recognized by the longitudinal furrow 

 along the dorsal side, which is so deep as to form a ridge in the interior. It has transverse 

 striae and microscopic longitudinal striae, and it is not curved. The embryo shell is 

 persistent and not separated by a partition. 



Genus Cuvierina, Boas, 1886 



Cuvierina columnella (Rang), 1827. 



Cleodora obtusa, Quoy and Gaimard, 1824. 



Cuvieria urceolaris, Morch, 1850. 



Triptera columnella and cancellata, Pfeffer, 1879. 



St. 80. 2 m. net, 30-0 m. : i specimen. 

 St. 84. Tow-net on dredge, 2000-0 m. : i specimen. 



St. 85. 4-5 m. net, 2000 (-0) m. : i specimen; 2 m. net, 900-0 m. : i specimen. 

 29° 27' 00" N, 15° 07' 00" W, 2 m. tow-net, 0-900 m. : i specimen from stomach oi Naucrates 

 ductor. 



