OP CONCHOLOGY. 217 



PLEUROTOMID^. 



CiTHARA DECUSSATA, Pease. — Plate 15, fig. 10. 



Description. — T. fusiformi, ovata ; anfr. superne angulatis, 

 longitudinaliter plicato-costatis, costis e suturis descendentibus, 

 ad angulum subnodosis, transversim elevato striatis, striis 

 minutissimis decussatis ; apertura dimidium longitudinis testse 

 sequante. 



Dimensions. — Long. 10, diam. 4| mill. 



Habitat. — Paumotus. 



Shell fusiformlj ovate, wliorls somewhat concavely, widely 

 angulated around the upper part, longitudinally plicately ribbed, 

 ribs descending from the sutures, nodulous at the angle, trans- 

 versely elevated, striated, decussated by very fine longitudinal 

 striae ; aperture one-half the length of the shell ; white. 



CiTHARA BREVis, Pease. — Plate 15, fig. 11. 



Description. — T. ovata, spira brevi, subobtusa ; anfr. longitu- 

 dinaliter forte costatis, costis rotundis, ad suturas erectis, trans- 

 versim elevato-striatis ; sutura profunda ; alba, fasciis fuscis 

 cincta. 



Dimensions. — Long. 8, diam. 4 mill. 



Habitat. — Paumotus. 



Shell ovate, spire short, obtuse ; whorls longitudinally strongly 

 ribbed, ribs rounded, erect at the sutures, and slightly overlapping 

 each other, transversely encircled by very fine stri^, sutures 

 deep ; aperture more than one half the length of the shell ; 

 white, banded (apparently) with brown. 



CiTHARA PAUCICOSTATA, Pease. 



Description. — T. oblongo-ovata, spira turrita, acuta, brevius- 

 cula : anfr. ad suturas angulatis, longitudinaliter costatis, costis 

 7, prominentibus, compressis, suturam incurrentibus, interstitiis 

 concavis, transversim subtilissime conferte striatis ; suturis 

 profundis ; omnino alba. 



Dimensions. — Long. 7, diam. 3 mill. 



Habitat. — Tahiti. 



Shell oblong ovate, spire rather short, turrited, acute ; whorls 

 angulated at the sutures, longitudinally ribbed, ribs 7, very 

 prominent, compressed, running into the sutures, interstices 

 concave, finely, regularly and closely striate transversely ; 

 sutures deep ; wholly white. 



