CLASS GASTROPODA 
93 
Turbonilla clarinda Bartsch, 1912 
Proceedings of the United States National Museum, 42 :264; PI. 35, fig. 4. 
Shell elongate-conic, bluish-white, semi-translucent. Nuclear whorls 
two and one-half, forming a rather solute, elevated, helicoid spire, whose 
axis is at right angles to the succeeding turns, in the first of which it is 
slightly immersed. Post-nuclear whorls well-rounded, appressed at the 
summit, marked by a very regular, rounded, slightly protractive, axial 
rib, of which sixteen occur upon the first to seventh, eighteen upon the 
eighth and the penultimate turn. These ribs become slightly flattened 
and somewhat expanded at the summit. Intercostal spaces a little wider 
than the ribs, well-impressed, terminating a little posterior to the suture, 
thus leaving a plain, narrow band immediately above the suture. Sutures 
somewhat constricted. Periphery and base of the last whorl well-rounded, 
smooth. Aperture subquadrate; posterior angle obtuse; outer lip thin, 
showing the external sculpture within; inner lip slender, slightly sinuous, 
and very slightly revolute. Length, 4.7; diameter, 1.1 mm. (Bartsch.) 
Type in United States National Museum, No. 211546. Type locality, 
San Diego Bay, California. 
Range. Known only from type locality. 
Turbonilla raymondi Dali and Bartsch, 1909 
Plate 49, figs. 17, 17a 
Bulletin 68, United States National Museum, 39; Pi. 2, figs. 17, 17a. 
Shell acicular, milk-white. Nuclear whorls small, two and one-half, 
forming a low helicoid spire, the axis of which is almost at right angles 
to that of the succeeding turns, in the first of which the nuclear spire 
is about one-fifth immersed. Post-nuclear whorls well-rounded, increas¬ 
ing very regularly in size, high between the sutures, almost appressed 
at the summit and ornamented by well-developed, rounded, axial ribs, of 
which there are sixteen upon the second and third, eighteen upon the 
fourth, twenty upon the fifth to eighth, twenty-two upon the ninth and 
penultimate whorls. Intercostal spaces deep, about one and one-half times 
as wide as the ribs. Periphery of the last whorl angulated. Base short, 
well-rounded. Aperture subquadrate. Columella short, slightly curved 
and somewhat oblique. Length, 6.2; diameter, 1.6 mm. (Dali and 
Bartsch.) 
Type in United States National Museum, No. 206849. Type locality, 
off Catalina Island, California. 
Range. Santa Rosa Island to San Diego, California. £ 
[3911 
