MARINE MOLLUSCA OF MADEIRA. 255 



de Sao Loureuco, and from Porto Santo. The animal is dark 

 green in colour. I have met with it nowhere but in my own 

 dredgings. 



The shell somewhat resembles that of Aclis Gulsonce, Jeftr., 

 but is very much smaller, the spire is much more contracted 

 and ends in a minute knob of a point, the outer lip is inflected 

 instead of being prominent and expanding, the suture is much 

 deeper, and the whorls are more prominent and rounded. 



22. Aclis trilineata, n. sp. 



Shell thinnish, semitransparent, rather glossy, longish, narrow 

 with squarish outlines. Sculpture : there are on each whorl 3 

 very strong rounded but slightly crested threads, absent on the 

 embryonic tip, faiut on the two succeeding whorls but well- 

 marked on all the others — no others appear on the base ; the 1st, 

 which is the strongest, lies a little remote from the suture and 

 forms for the whorl a well-marked shoulder; the 2nd, though 

 helped by the bulge of the whorl, is barely more prominent than 

 the first ; the 3rd is slightly feebler than the others, and lies 

 near but quite clear of the suture : besides these there are faint 

 close-set microscopic striations and vaguer traces of longitudinal 

 markings ; the furrows between the threads are shallow and 

 rounded. Colour white and semitransparent. Spire high and 

 narrow, ending a little abruptly in a small rounded, not pro- 

 minent tip. Whorls 6|. Eroin the suture there is a downward 

 sloping shoulder to the first thread, from which the very straight 

 contour-line runs down parallel to the axis, and with scarcely 

 any contraction into the suture below. Suture broad, open, and 

 shallow, rather oblique. Mouth oval, rather large. Outer lip 

 thin, with a free convex sweep. Inner lip thin, shar p, and 

 promineut, with a well-rounded curve it spreads very thinly 

 across the body. Umbilicus a shallow, small, funnel-shaped 

 depression.— L. 0-08. B. 003. 



Of this species I got only 5 specimens (and of these but one 

 full-grow r n) in deep water from the east end of the island. The 

 shell slightly resembles A. ascaris, Mont., but is smaller, less 

 delicate in the whorls, spire, and tip, and is different in 

 sculpture. 



23. Aclis tricarinata, n. sp. 



Shell stroug, rather stumpy, semitransparent, and somewhat 

 glossy. Sculpture : excessively strong spiral keels project from 



