138 Zoological Society. 



Pleurotoma violacea. Pleur. testa elongatd, acuminata, violaced ; 

 anfractibus decenis multicarinatis, longitudinaliter minutissime et 

 creberrime striatis ; carinis duabus eminentioribus ; labro tenui, 

 acuta, crenulato ; sinu laterali inter carinas ; aperturd ovali ; colu- 

 melld biplicatd ; cunali brevi. Axis 8 lin. 

 Hab. North coast of New Guinea and Straits of Macassar. From 

 seven to twenty- two fathoms ; sandy mud. Also collected by Mr. Cu- 

 ming at the Philippines. 



The folds on the columella, for which this species is remarkable, 

 are not to be met with in all the specimens. 



Pleurotoma radula. Pleur. testdpyramidali, acuminatd, corned; 

 anfractibus nonis, lineis decussatis, uniseriatim tuberculatis ; tuber- 

 culis sublunatis ; labro tenui, acuto ; sinu laterali pone seriem tuber- 

 culorum; suturd lined elevatd instructd; aperturd ovali; canali 

 brevi. Axis 7 lin. 



Hab. Straits of Malacca. In seventeen fathoms ; mud. 



Clavatula, Lamarck. 



The shells of this genus are subfusiform or clavate; the canal 

 sometimes so short as to be almost wanting, at others somewhat 

 produced and recurved ; sinus superior to the most prominent part 

 of the whorl, with a callous everted margin ; inner lip often pro- 

 duced ; suture frequently embellished ; sculpture nearly always lon- 

 gitudinal; outer lip with a slight inferior sinus. This genus is 

 rather less tropical in its geographical relations than Pleurotoma. In 

 attempting to trace the limits of variation, it may be observed that 

 the canal is liable to fluctuate in length, as may be seen in C. dupli- 

 cata. Sow. (sp.) ; also in the length of the spire. Varieties in colour 

 are not infrequent, and have been remarked in the above species, in 

 C. jiavidula, Lamarck (sp.), and in C. crenularis, Lamarck, each of 

 which has light and dark varieties. Lastly, the series of tubercles 

 which some display are usually connected by a keel, and the par- 

 ticular sculpture fluctuates between each, as occurs in a remarkable 

 manner in C. cincta. Sow. (sp.) 



Clavatula militaris. Clav. testd turritd, elongatd, acuminatd, 

 albidd ; anfractibus superne concavis et angulatis, plicis numerosis 

 longitudinalibus , granosis lineis decussatis ; prope suturam carind 

 subnodosd instructd ; labro intus l<svi ; aperturd lineari, in canali 

 brevi recurvo desinente. Axis 20 lin. 



Hab. Veragua, Central America ; in eighteen fathoms. Panama ; 

 in from eight to thirty fathoms ; mud. 



Clavatula Sinensis. Clav. testd fusiformi, acuminatd, corned; 

 anfractibus undenis, subplanulatis, medio costulatis, lineis fuscis 

 decussatis; suturd granoso- carinatd ; labro intus Icevi ; aperturd 

 ovali ; canali mediocri. Axis 9 lin. 



Hab. New Guinea; Straits of Macassar ; China Sea. In from five 

 to twenty- one fathoms ; mud. 



Clavatula spicata. Clav. testd fusiformi, albidd; anfractibus 

 octonis, costulatis, transversim striatis ; costulis subacutis ; suturd 



