REPORT ON THE GASTEROPODA. 361 



originate somewhat prominently iu an angle of the whorls below the sinus-area, and run 

 down to the point of the base, but do not extend to the snout ; they are parted by rouuded 

 furrows of nearly three times their width : close below the siuus is a crowded row of very 

 short, small, curved bars — the old sinus-scars. The whole surface is closely, very regularly, 

 and rather sharply scored with lines of growth. Spirals — the earlier whorls are keeled by 

 three equal, equally prominent, and equally parted rounded threads ; on the last whorl 

 others, weaker, appear between these ; the lowest of the three loses in importance, and 

 about seven others, not all quite equal nor quite equally parted, occupy the base, while 

 four or five more somewhat similar cover the snout. Colour probably white, but stained 

 with mud in which the specimens have lain. Apex : there are four embryonic whorls, 

 which form a high cone with a slightly impressed suture ; the extreme tip has evidently 

 been small, but is broken : the sculpture is not typical, but consists of a series of straight 

 bars ornamented with rough and projecting tubercles ; these cross the whorls, but at the 

 top and bottom of the whorls another set of short little bars occur between the larger 

 ones. Mliorls: these are 9 in all, of regular increase, rather short ; above they are slightly 

 concavely horizontal, at the three keels cylindrical, and below this contracted into the 

 inferior suture ; the last whorl is very short, a very little swollen, with a very short 

 rounded base and a small snout. Suture impressed, but open. Mouth small, oval, 

 rounded above, and drawn out into a canal below. Outer lip straight in the sinus-area, 

 high-arched in the middle, concave in front, and straight along the canal : the edge forms 

 a high shoulder above, between which and the body is the open, deep, rounded sinus. 

 Inner lip thinly excavated, very early cut off at the sharp oblique edge of the pillar. 

 H. 0-23 iu. B. 0-09. Penultimate whorl, height 0-045. Mouth, height 009, breadth 0"05. 



This species is classed under Clathurella only provisionally with a mark of interrogation, in con- 

 sequence of the departure of the embryonic whorls from the typical sculpture. That sculpture and 

 form of apex may probably serve as the safest basis of classification in the whole group. 



15. Clathurella cala, 1 n. sp. (PI. XXVI. fig. 11). 



Station 335. March 16, 1876. Lat. 32° 24' S., long. 13° 5' W. South-east Atlantic. 

 1425 fathoms. Pteropod ooze. Bottom temperature 37°. 



Shell. — Thin, delicate white, angulated, obliquely plicate, spiralled, scalar, with a 

 conical spire, a chestnut tip, a deep suture, short body-whorl, very contracted base, and a 

 short, small, straight snout. Sculpture: Longitudinals — there are on the last whorl 

 about 15 (the number slowly decreases up the spire) narrow pinched-up oblique ribs 

 which take their origin below the sinus-scar and die out on the base ; they form a high 

 bunchy shoulder to the whorls ; on the upper whorls they extend to the lower suture ; 



1 xa\6;, beautiful. 

 (zool. CHAIX. EXP. — part xlii. — 1885.) Tt 46 



