DEEP-SEA CONOIDEAN GASTROPODS 

 Genus LUCERA />£* Iredale, 1936 



Type species: Pleurotoma casearia Hedley & Petterd, 1906 

 (original designation) 



Lucerapex adenica Powell, 1964 



Fig. 76 



Lucerapex adenica Powell, 1964, p. 286-287, pi. 221, fig. 3. 



Type locality. 'Mabahiss' (John Murray Expedition), stn 34, 

 Gulf of Aden, 1022 m. 



Material, stn 193, 1 shell; also described from stn 34 and 191 

 by Powell (1964). 



The specimen figured (H = 31.0 mm which is slightly more than 

 in the type specimens) was probably omitted by Powell whose 

 original decription of the species was based on the JME 

 material. 



Distribution. Gulf of Aden, 274-1080 m. 



Lucerapex molengraaffi (Tesch, 1915) 



Figs 77 & 78 



Pleurotoma (s.str.) molengraaffi Tesch, 1915, p. 28, pi. 77, figs 



54-56. 

 Lucerapex molengraaffi (Tesch) - Powell, 1964, p. 287-288, pi. 



220, figs 3, 4, pi. 221, figs 1,2. 



Type locality. Timor, Pliocene. 



Material, stn 145, 1 shell. 



Distribution. Maldive Islands, Borneo, Celebes, Phillipines, 

 464-1022 m. 



Family CONIDAE Fleming, 1 822 



Subfamily CLATHURELLINAE H. & A.Adams, 1858 



Genus BORSONIA Bellardi, 1839 



Type species: Borsonia prima Bellardi, 1839 (monotypy) 



Borsonia ochracea Thiele, 1925 



Figs 82 & 83 



Borsonia ochracea Thiele, 1925, p. 183-184 (217-218), pi. 38(26), 

 figs 1-3, text fig. 26. 



Type locality. 'Valdivia', stn 257, (off Somalia), 1644 m. 



Material, stn 122, 1 specimen; stn 184, 1 shell. 



The JME material agrees well with Thiele's original figures 

 differing only in having somewhat narrower and more widely 

 spaced spiral ribs (though this may result from rather 

 schematized appearance of spiral sculpture in many Thiele's 

 figures). The columellar pleat is very weak and can be seen only 



19 



if the aperture is broken. The radular teeth are also very similar 

 to those figured by Thiele; the operculum is absent as in the type 

 specimens. 



Distribution. East Africa from Zanzibar to the Gulf of Aden, 

 693-1644 m. 



Subgenus CORDIERIA Rouault, 1848 



Type species: Cordieria iberica Rouault, 1850 (subsequent 

 designation Cossmann, 1896) 



Borsonia (Cordieria) symbiophora Sysoev, new species 



Figs 5, 12, 13, 81 & 85 



Material, stn 26, 4 specimens (paratypes No. 1993103); stn 

 118, 6 specimens (holotype No. 1993101 and 5 paratypes No. 

 1993102). 



Description of holotype. The shell is of medium size for the 

 genus, broadly fusiform, rather stout, strong, white under 

 olivaceous periostracum and light-brown inside the aperture, 

 and consisting of 7 whorls. The protoconch is missing, and the 

 upper whorls are eroded. Definitive whorls are obtusely angled 

 at the periphery, slightly concave at the subsutural slope and 

 weakly convex below. The body whorl is rather large (0.65 of the 

 shell height), the shell base is weakly convex, and passes 

 smoothly into the canal. The sutures are wavy and channelled. 

 The axial sculpture consists of wide, rounded, short folds which 

 are obsolete in the middle part of the subsutural slope (they can 

 be traced as very low tubercles just below the suture) and do not 

 reach the shell base. The folds are most prominent just below the 

 subsutural slope at the whorl periphery. There are 1 2 folds on the 

 body whorl and 1 1 on the penultimate. Spiral sculpture is 

 represented by wide, rounded, low ribs separated by narrow 

 grooves and covering the entire shell surface. On the shell base, 

 the ribs become subobsolete, with wider interspaces. The growth 

 lines override the ribs making their surface rugose. The aperture 

 is rather wide and not differentiated from the wide and short 

 canal. The inner lip is smooth, covered by glossy callus. The anal 

 sinus is symmetrical, wide and shallow, its deepest part is 

 situated in the middle of the subsutural slope. H = 27.4, Hb = 

 17.8, Ha = 13.9, D= 11.5mm. 



The paratypes are very variable in the character of spiral 

 sculpture which may be either well developed or subobsolete to 

 obsolete. There is no correlation between the prominence of 

 spiral ribs on the subsutural slope and on the rest part of the 

 whorl. Paratypes of smaller size have more biconic shells with 

 narrower canals. 



The protoconch is broken in almost all specimens. In the only 

 specimen with an intact but eroded protoconch, it seems to 

 consist of 1 .5 rapidly increasing whorls. 



The radular teeth are typical of borsoniid group of genera, 

 small (0.24 mm in paratype from stn 185, H = 21.8 mm), 

 straight, rather short, with a cusp at the tooth base. 



The operculum is small, leaf-shaped, vestigial, with a terminal 

 nucleus. In one paratype from stn 185 the operculum, probably 



Figs 76-S9 Turrinae, Zonulispirinae and Clathurellinae. 76 - Lucerapex adenica Powell, 1 964, stn 1 93, H = 3 1 .0 mm; 77, 78 - L. molengraaffi 

 (Tesch, 1915), stn 145, H = 25.1 mm; 79, SO-Ptychobela cf. suturalis (Gray, 1838), stn 35 (79) and 188 (80), H = 31.1 (79) and 22.7 (80) mm; 81, 85 - 

 Borsonia ( Cordieria) symbiophora Sysoev, new species, holotype (81 ) and paratype, stn 1 1 8, H = 23.8 mm (85); 82, 83 - Borsonia (Borsonia) ochra- 

 cea Thiele, 1 925, stn 1 22, H = 37.0 mm; 84 - Ptychobela cf. nodulosa (Gmelin, 1 791 ), stn 1 88, H = 29.6 mm; 86-88 - Typhlomangelia maldivica 

 Sysoev, new species, holotype (86) and paratype, stn 143, H = 32.0 mm (87, 88); 89-7? adenica Sysoev, new species, holotype. 



