DEEP-SEA CONOIDEAN GASTROPODS 



14 



15 



17 



Figs 14-17 Opercula. 14 - Typhlomangelia adenka Sysoev, new species, paratype, stn 1 85, H = 7.7 mm; 15 T. maldivica Sysoev, new species, para- 

 type, stn 143, H = 27.8mm; \6- Bathytoma ( Parabathytoma) regnans Me\\i\\, 1918, stn 34, H = 26.6mm; 17 B. (R)fissa (von Martens, 1901), 

 stn 176, H = 35.3 mm. Scale-line = 0.1 mm. 



Genus SPLENDRILLIA Hedley, 1922 



Type species: Drillia woodsi Beddome, 1883 (original 

 designation) 



Splendrillia zanzibarica Sysoev, new species 



Figs 1, 10 & 22 



Material, stn 119, 1 specimen (holotype, No. 1993089) and 1 

 shell (paratype, No. 1993090). 



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

 genus, slender, angularly claviform, grayish-white with dull 

 surface, rather thin, consisting of 5.5 remained whorls. The 

 protoconch is missing; the bluntly closed beginning of initial 

 teleoconch whorls is seen in the shell apex. The whorls are angled 

 slightly above the periphery, concave above the angulation and 

 almost flat below it. Sutures are clear, shallow, slightly wavy. The 

 spire is high, occupying about 0.4 of the shell height. Axial 

 sculpture consists of strong oblique folds, rapidly disappearing 

 on subsutural slope and forming pointed tubercles at the whorl 

 periphery. Intervals between folds are narrower than the folds 

 themselves. The folds reach the lower part of the shell base but 

 weaken greatly on the last third of the body whorl. There are 

 about 15 folds on the body whorl and 12 on the penultimate. 

 Spiral sculpture is absent except for very indistinct striation seen 

 only on the shell base near aperture. The aperture is oval and 

 gradually narrows towards the canal. The inner lip is covered by 

 a longitudinally rugose callus. The anal sinus is rather shallow, 

 broadly open, with the edge somewhat spout-like. The canal is 

 moderately long and wide. H = 19.3, Hb = 1 1.7, Ha = 9.3, D = 

 8.1 mm. 



The operculum is oblanceolate, with a terminal nucleus. 

 Radula is typical for the genus, with small central and comb-like 

 lateral teeth. Each marginal tooth is accompanied by a 

 transparent, usually more or less triangular plate at its base 

 (better seen in detached teeth) which is probably a part of 



radular membrane serving as a tooth ligament. Mean length of 

 marginal teeth is 0.26 mm. 



The shell of the paratype (H = 19.4 mm) is badly worn and 

 does not differ from the holotype in essential characters. 



The species is characterized by strongly angled whorls, 

 oblique axials, and, especially, long canal. It resembles the East 

 African Drillia indra Thiele, 1925 while differing in having 

 almost 3 times larger shell with long axials and without a distinct 

 angulation at the shell base. 



Distribution. Zanzibar, 1207-1463 m. 



Family TURRIDAE H. & A.Adams, 1853 



Subfamily CLAVATULINAE 



Genus TURRICULA Schumacher, 1817 



Type species: Turricula flammea Schumacher, 1817 (monotypy) 

 (= Murex tornatus Dillwyn, 1817) 



Turricula new species 



Figs 26 & 30 



Material, stn 119, 1 shell. 



A single young shell (H = 21 .0 mm) apparently represents a new 

 species. It resembles most closely the shallow-water species 

 Turricula catena (Reeve, 1843) distributed in the Red Sea and 

 Persian Gulf, but clearly differs in the absence of the subsutural 

 fold sculptured with axial ribs and in the absence of spiral 

 sculpture on the shell base. In general shell outline it also 

 resembles Surcula fulminata var. gloriosa Melvill, 1917, which 

 Powell (1969) dismissed as an abnormal variant of Turricula 

 tornata fulminata (Kiener, 1839^10), but is distinguished in its 

 heavy nodulose peripheral carina and almost complete absence 

 of spiral ribs except for those on the canal. However it seems 



