Siliquaria.] GASTROPODA. 263 



Genus 4. SILIQUARIA, Bruguiere, 1789. 



Siliquaria, Brug., Encycl. Meth., i, p. xv. Ex. : S. australis, Q. & G. 

 Tenagode, Guettard, 1774 : Guettard did riot adopt the Linnean nomen- 

 clature, and it seems unsettled that he used any Latin name for the 

 genus (Da II). 



Animal with rudimentary pedal tentacles ; mantle slit along the 

 branchial cavity. 



Shell tubular, at first spiral, afterwards protracted and irregular ; 

 tube with a longitudinal fissure, which is sometimes simple, sometimes 

 formed by a series of perforations ; often both varieties exist in the 

 same specimens. Aperture circular, without internal septa or lamella. 

 Opcrculum corneous, subcylindrical or conoidal, formed of a spirally 

 rolled band, with ciliated margin ; axis of the cone filled up internally 

 by a series of spiral radiating cells. 



Distribution. Mediterranean, west Africa, tropical Pacific Ocean, 

 Australasia. 



Fossil. One species from the Upper Cretaceous and about twenty 

 from the Tertiary are known. The typical species, as well as several 

 others, occur imbedded in sponges. 



The Recent species are tropical and subtropical in distribution. 

 They live on rocks and corals, and sometimes in sponges. 



Sect. 1. AGATHIRSES, Montfort, 1810. 



Agathirses, Mtft., Conch. Syst., i, 398. Ex. : S. striata, Defrance. 

 Slit composed of numerous isolated holes. 



1. Siliquaria Cumingi, Morch, 1860. Plate 15, fig. 8. 



Tewigodts (Siliquaria} Cumingi, Morch, P.Z.S.. 1SUO, 403. Siliquaria 

 Cumingi, Morch, .Man. Conch. (1), ix, 190, pi. 57, f. 19; pi. 58, f. 21. 

 Tenagodes Cumingi, Morch, Index, 76. 



Whorls 5, the first scalariform, angulated behind, the angle evan- 

 escent in the last whorl, granularly lirate below, lime distant, the 

 interstices with intervening lirulas, externally transversely lightly 

 fissured, the fissure evanescent in the last whorl, umbilical region 

 longitudinally undulately striate, decussated by sigmoid distant 

 radiating sulci ; slit at first closed, afterwards with open round holes, 

 which finally coalesce into a denticulated open slit (Tryon). 



Type in the British Museum (?). 



Hab. A specimen from Auckland is in the Canterbury Museum. 



The type is from the Philippines. 



Remark. I am inclined to consider the specimen in the Canter- 

 bury Museum as a variety of the next species. 



Sect. 2. PYXIPOMA, Morch, 1860. 

 Pyxipoma, Morch, P.Z.S., 1860, 409. Ex. : 8. multistriata, Defrance (Eocene). 



Slit closed by a lamella, but not filled up outside ; open near the 

 mouth. 



