KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:O0O 16. 45 
Radula (fig. 8) ot 3FT.371.G6. Inner teeth of the radula very uniform; 
median tooth and the first two laterals with a long cusp and 2 small denticles on 
each side of its base; third lateral with 3 or 4 denticles ; transitional tooth vestigial; 
uncini much elongated, about the first 10 like the laterals with an increasing number 
of dentieles and successively obliterating cusps; the nearest following ones with 
reduced cusps and pectinated outer edges; the outermost uncini more erect and with 
serrated, then smooth, edges of the abrupt upper ends. 
Turcica maculata BRAzIER. 45 miles W. S. W., 48 feet ('"/;), 1 sp., h. 13 mm. 
— The species was previously known from Cape York, south N. Guinea, and Torres 
Straits (PILSBRY 1889). 
Delphinula distorta LINNÉ, var. zonata n. var. (Pl. 2, figs. 40, 41; text fig. 9). 45 
miles W. S. W., 60—80 feet ('”/1), 2 sps. Shell depressed, widely and openly umb- 
ilieated, mouth wide, circular, with the outer margin projecting above. Spire with 
3—4 flattened whorls with slight undulations and a sharp angular keel, tubercled at 
certain intervals. Last whorl with about 10 produced spines on the angular keel, 
above it with 3 (towards the mouth 5) spiral rows of smaller spines, directed for- 
wards, and below the angular keel with 8 (towards the aperture 9) equal rows, the 
last one bounding the umbilicus ; even within the umbilicus 3—4 rows of spinules. 
Colour: shell banded with brown, whitish yellow and red: a broad dark brown band 
on half the breadth of the upper surface of the whorls, the spines and a zone beneath 
the angular keel down to half the height of the wbhorl, light reddish; umbilicus 
deeply down and the spine rows within and around it dark brown; for the rest 
yellowish white. Mouth inwardly whitish, iridescent. Upper whorls light reddish 
with a deeper tint in the periphery, and with the brown band tapering upwards as 
a sutural line. Operculum horny brown, multispiral. Dimensions: max. height 23, 
br. 27.5, h. of aperture outwardly 17, inwardly about 15 mm. — This variety dif- 
fers from the typical D. distorta LINNÉ chiefly in the upper surface of the last whorl 
being spinous, while it is destitute of spines and only spirally lirate in D. distorta. 
In one of the two specimens the brown as well as the red zone were more expanded 
and the rows of spines more numerous with smaller and denser pricks (11 rows 
between the angular keel and the periumbilical spiral). The specimen (PI. 2, fig. 40) 
exhibited also a trace of longitudinal folds on the upper part of the whorls. It 
carried 2 specimens of Crepidula aculeata with a sculpture of fine prickles and even 
in its brown colour closely resembling the Delphinula. — The dark umbilicus is a 
characteristic that this species has in common with the West Australian D. tyria 
REEVE as well as with certain colour variations of D. delphinulus LiNNE (laciniata 
LAMARCK). — Distribution of the typical form: Indian Ocean, Nicobar Isl. (TRYON 
1888, Man. of Conch. 10); Japan (R. M.). 
The radula has the formula & .1.5.1.5.1.0. (fig. 9). Median tooth broad 
with a straight, abrupt edge; the first three laterals with small conical apices, the 
two outer ones with highly enlarged cusps, the first of them with one, the second 
with two small denticles in the outer side of the base; transitional tooth with a 
