10 



A.V. SYSOEV 



Figs 42-48 Comitas paupera (Watson, 1 881 ). 41 - lectotype, H = 40.0 mm; 43, 44 - paralectotypes, H = 33.3 (43) and 1 8.5 (44) mm, BM(NH) 

 1887.2.9.1009-1 1; 45, 46- stn 62, H = 23.4 (45) and 17.5 (46) mm; 47,48- stn 185, H = 14.0 (47) and 14.9 (48) mm. 



Comitas curviplicata Sysoev, new species 



Fig. 29 



Material, stn 184, 2 specimens (holotype No. 1993092 and 

 paratype No. 1993093). 



Description of holotype. The shell medium size, fusiform, 

 rather thin, covered with light-brown periostracum, consists of 7 

 whorls. The protoconch is missing. The whorls are angled at the 

 periphery or below it (on upper whorls). The subsutural slope is 

 broad and weakly concave. Sutures are slightly wavy, shallow. 

 Axial folds are low, reversed-sigmoid, they form strong rounded 

 nodules below the subsutural slope and then rapidly weaken and 

 become narrowly crested, but extend to the lower suture on the 

 spire whorl and to lower part of the shell base. There are 1 5 axial 

 folds on the body whorl and 13 on the penultimate. The 

 subsutural slope is devoid of axial sculpture. Growth lines are 

 mostly indistinct except those on the subsutural slope, but some 

 are rough and raised. Spiral ribs are unequal in width and 



prominence, generally they are most closely spaced in intervals 

 between peripheral nodules and further apart on the lower shell 

 base and the canal. Two ribs on the upper shell base are raised 

 and most prominent. The subsutural slope is covered with 

 subobsolete, closely set ribs which are obsolete on some parts of 

 the shell; there are also two shallow grooves in the middle of 

 subsutural slope. The body whorl is large, occupying about 0.66 

 of the shell height. The shell base is almost flat, evenly curved in 

 transition to the canal. The aperture is oval, with the inner lip 

 evenly curved and covered by a wide callus which bears oblique 

 folds being the continuation of spiral ribs. The anal sinus is 

 moderately deep, broadly V-shaped, with its apex being in the 

 middle of subsutural slope. The canal is moderately long, 

 slightly turned to left. The operculum is large, leaf-shaped, with 

 terminal nucleus. H = 32.4, Hb = 21.6, Ha = 17.6, D = 13.0 mm. 



The paratype (H = 29.2, D = 11.8 mm) is similar to the 

 holotype, but has rather worn surface. 



The new species is similar to C. arcana (E.A.Smith, 1899) from 

 Andaman Islands and Southern India (338-658 m) but differs in 



