PLECOTREMA $. 2. 9345 
maculata; spira conica, mucronata; sutura simplex; anfr. 7—8 
vix convexiusculi, ultimus ventrosus, spira longior, pone aper- 
turam cristatus, antice contractus; apertura obliqua, angustata; 
plicae parietales 2 obliquae, superior obtusa, inferior acuta 
imrans, extus bifida, crure superiore parvulo; plica columel- 
laris valida, ascendens; peristomium rectum, marginibus callo 
lato nitido junctis, dextro in medio bidentato, columellari 
sinuato, adnato. — Long. 5!/; lat. 3!/;; ap. long. 3, lat. 1!/, 
mill.* (D.) 
Plecotrema mordax JDohrn in Malak. Bl. VI. 1859. p. 204. 
— — Pease in Journ. Conch. XIX. 1871. p. 93. 
-— — . Martens & Langk. Don. Bismark. 1871. p. 55. t. 3. f. 8. 
— —  . Morelet in Ann. Mus. Genov. III. 1872. p. 206. (Spe- 
cimina potius ad PL rapacem pertinent: Jickeli.) 
— — Pütel Catal. p. 114. 
Habitat Tahiti (Vesco), ins. Anaa (Pease), Mare Rubrum 
(Issel, Morelet). 
Obs. Species verosimiliter P/. rapaci Dohrn injungenda. (ick. Moll. 
Nordost-Afr. p. 183.) 
* 
10. exarata H. & A. Adams. I. 104. II. 79. — Zssel Moll. Born. p. 
62. — Borneo. 
11. Pl. Binneyi Crosse. 1 
»T. subrimata, ovato-conica, parum crassa, nitidula, striis 
obsoletis, sub oculo armato interdum pertusis, transversim 
impressa, pallide fusca, in vicinio suturae valide marginatae 
albido-cinerea; spira mediocriter elevata, mucronata; anfr. 8 
planiusculi, embryonales 2 laeves, cornei, ultimus non descen- 
dens, spiram paulo superans, basi attenuatus, albidus; apertura 
vix obliqua, oblonga, angusta, intus fusca, plicis 2 parietalibus, 
altera parviuscula, nodiformi, altera valida, lamelliformi, pro- 
funde intrante, et tertia columellari coarctata; perist. subdu- 
plicatum, incrassatum, livide albidum, marginibus callo junctis, 
externo intus incrassato, unidentato, columellari expansiusculo. 
— Long. 5!/,, diam. maj. 3 mill. Apert. cum perist. 3!/, mill. 
longa, 2 lata.* (C.) 
Plecotrema .DBinneyi Crosse in Journ. Conch. XV. 1867. p. 448; XVII. 
1869. p. 395. t. 12. f. 5. 
Habitat ,Peron's Peninsula, Shark Bay*  Austrahae 
(B. Wright). 
19. Pl. exigua H. Adams. 1 
,P. testa profunde rimata, ovato-conica, solida, spiraliter 
valde sulcata, longitudinaliter striata, pallide fulva; spira 
