MOLLUSCA. 43 



shouldered ribs, and by the remarkable circumstance of the plaits on the columella 

 being reversed in size, the inferior being the largest. 



176. Cancellari a funiculata, Hinds, 1. c. p. 48, (Plate XII, fig. 5, 6.) Testa ovata, elon- 

 gata ; anfractibus senis, costatis, superne subangulatis ; costis subdistantibus elevatis, rotundatis, 

 nodulosis, lineis elevatis decussatis ; sutura. profunda ; labro intus sulcato ; columella plicis tribus 

 parvis; umbilico marginato ; canali subnullo. 



Inhab. A single specimen only was obtained by the dredge from seven fa- 

 thoms, sandy mud, in the Gulf of Magdalena, California. 



177. Cancellaria bicolor, Hinds, 1. c. p. 48, (Plate XII, fig. 13, 14.) Testa, retusa, 

 contabulata, fusco-nigricante; anfractibus septenis, angulatis, procul costatis; costis acutis, lineis 

 elevatis distantibus decussatis; apertura trigona, superne callositate alba; labro reflexo, intus sulcato; 

 columella triplicate ; umbilico magno. 



Inhab. Straits of Macassar. From ten fathoms, coarse sand. 



A nearly allied species is the American shell, C. rigida, Sowerby ; but the 

 present is a larger shell, with sharper distant ribs, crossed at regular distances by 

 slightly elevated lines, and the peritreme is not crenulate. The ribs of C. rigida 

 are nodulous from the crossing lines, which are also disposed to rugosity through- 

 out. In C. bicolor the lines are particularly regular and uniform in their 

 characters. 



178. Cancellaria lamellosa, Hinds, 1. c. p. 49, (Plate XII, fig. 15, 16.) Testa, ovata, 

 acuminata, pallida, contabulata; anfractibus senis, ventricosis, lamellis numerosis confertis crenatis 

 in loco costarum instructis; apertura trigona; labro incrassato, reflexo; columella plicis tribus 

 parvis ; umbilico magno ; canali subnullo. 



Inhab. This species has an extensive habitat, being found in several places 

 in the Indian Archipelago and at the Cape of Good Hope. At the latter a single 

 specimen was obtained on the L'Agulhas Bank in seventy fathoms ; also at Ceylon 

 and in the Straits of Macassar. 



Corresponding to the customary situation of the ribs, this species throws off 

 series of lamellae, two or more in number, which present a sharp, reflected, 

 crenated margin. These are clustered together in very irregular numbers, some- 

 times there being only two, or perhaps even one ; but as the shell advances in age 

 they are usually crowded together in some numbers, and this remarkable and 

 elegant character will readily distinguish it from any other species. 



179. Cancellaria antiquata, Hinds, 1. c. p. 49, (Plate XII, fig. 17, 18.) Testa ovata, 

 acuminata, contabulata, albida ; anfractibus septenis, planulatis, costatis, transversim striatis ; costis 

 acutis, superne spinis cavis desinentibus ; apertura. trigona; labro reflexo; columella plicis tribus 

 minimis ; umbilico maximo. 



Inhab. New Guinea. In twenty-two fathoms, coarse sand. 



