= 
länge, schräg, ziemlich schmal eiförmig, mit kurzem Kanal; Mundsaum fast zusammenhängend ; 
Aussenrand sehr scharf, breit, aber wenig tief ausgeschnitten, Spindelrand S-förmig, mit schmalem Callus. 
Aufenthalt im Mittelmeer (vor Marseille in 555 m), am Senegal (Cap Merick in 2324 m), an 
den Azoren (bei 1257 m). 
Nach dem Autor vermuthlich zunächst verwandt mit Pl. (Cymatosyrinz) centimata, Dall. 
3. Genus Leucosyrinx, Dall. 
Testa albida vel unicolor pallide lutescenti alba, tenuis, undique liris spiralibus eineta, infra 
suturam costellis obliquis sculpta; sinus supraperipherieus infrasuturalis; operculum tenue nucleo 
apicali, impressione musculari parva. Anfractus embryonales vitracei, rotundati vel carinati. 
Leucosyrin& subg. Pleurotomae, Dall, Rep. Moll. Blake, II, in: Bull. Mus. Cambridge v.18 p. 75. 
Dall hat diese Gattung für die Pleurotominen des Tiefwassers errichtet, welche sich von den 
echten Pleurotomen des seichten Wassers durch die dünne, einfarbige, feinskulptirte Schale unter- 
scheiden, von Drillia durch den Mangel eines Randvarix und eines Vorsprunges am unteren Rande 
der Bucht. Die Spiralskulptur ist unter der Naht eben so deutlich wie sonst. 
1. Leucosyrinx sigsbei, Dall. 
Taf. 81, Fig. 17. 
Testa fusiformis, gracilis, tenuis, fuscescenti-albida, spira acuta, canali sat longo, leviter torto, 
Anfractus 11, apieales 3—4 nitidi, serie nodulorum infrasuturali sculpti, sequentes medio angulati, 
liris spiralibus planis vix elevatis, in spatio subsuturali quoque distinetis eineti, interstitiis aequalibus, 
ad angulum tubereulis obliquis, infra continuatis eirca 18 in anfraetu ultimo, aperturam versus obso- 
lescentibus armati, ultimus dimidiam longitudinem superans, in caudam leviter tortam attenuatus. 
Apertura angulato-ovata, in canalem elongata; columella simplex margine acuto, contorto, callo tenui 
extus distinete marginato induta. 
Long. 25,5, diam. 9,5, long. anfr. alt. 15, apert. 11,75 mm. 
Pleurotoma (Pleurotomella) Sigsbei, Dall*), Preliminary Report Moll. Blake, in: Bull. Mus. 
Cambridge v. 9 Nr. 2 p. 57 (1881); (Leucosyrinz) Report Blake Mollusca, Il. Gastropoda, in: Bull. 
Mus. Cambridge, v. 18 p. 76 t. 11 fig. 10. — ? (Sigsbei) Dautzenberg & Fischer, Dragages Hirondelle, 
in: Mem. Soc. zool. France 1896 v. 9 p. 408 t. 16 fig. 1. 
*) Shell in general closely resembling Pl. verrillii, with the following differences: has the same number of whorls 
in 25,5 mm length; it is proportionally more slender; the knobs are oblique instead of perpendieular, in the spire are 
set in the middle of the whorls instead of near the suture, are less prominent and become obsolete toward the end of 
the last whorl; there are about eighteen on the last whorl that has them, and they are proportionally more produced 
than in the last; the pillar is less twisted and the sharp flaring edge near the anterior is not so prominent; the nucleus 
is smooth and light brown; the remainder of the shell has a brownish tinge compared with the preceding. — The spiral 
threads in this and Pl. Verrilli cover the ante-sutural band as strongly as any part of the shell. 
