REPORT ON THE GASTEROPODA. 93 



Turbo nicobaricus, Wood, Ind. Test. (ed. Hanley), p. 149, pi. xxx. fig. 3 (LMorina). 



„ ,, Reeve, Conch. Icon., vol. iv. pi. xi. 48. 



„ „ Fischer, List of Souverhie's New Caled. Shells, Journ. de conch, vol. viii. p. 202. 



„ „ Fischer, Joum. de conch., vol. ix. p. 265. 



Ghrysostoma paradoxum, Adams, Genera, vol. i. p. 410, pi. xlvi. fig. 4. 



„ nicobaricum, Crosse, Journ. de conch., vol. xiv. p. 116, pi. v. fig. 8 (the operculum). 



Trochus (Clirysostoma) nicobaricus, Von Martens, Moll. Mauritius, &c, p. 297. 



February 1, 1875. Samboangan, Philippines. 10 fathoms. 



Wild Island, Admiralty Islands, north of Papua. 



Habitat. — Mauritius (? Von Martens), Nicobar Islands (Chemnitz), Philippines (Cum- 

 ing), New Caledonia (Souverbie). 



The change from Chemnitz's well-known name is an unfortunate necessity. Bora's description 

 of the species is unmistakable, his right of priority inalienable, and Chemnitz's avowed change 

 indefensible. In these circumstances the return to Bom's name must be made some day; the 

 sooner, therefore, it is made the better, and Adams has already set the example. 



2. Gaza, 1 Watson, 1878. 



Gaza, "Watson, Prelim. Report, pt. 3, Journ. Linn. Soc. Lond., vol. xiv. p. 601. 



Shell trochiform, nacreous both on the surface and throughout, delicately sculptured, 

 with a reversed lip thickened internally by a nacreous callus ; the pillar twisted, direct, 

 in front angulated and pointed, behind entirely parted from the lip, and in the umbilical 

 region spread out in a nacreous pad. The operculum is round, membranaceous, thin, and 

 many-whorled. 



Whether this and all the other features enumerated above will prove constant is a question for 

 time to determine. At present a new genus is inevitable ; for this shell, though plainly one of the 

 TrochidaB and of the Trochocochlea group, cannot possibly be put into the genus Trochus in any 

 of its divisions. In form it resembles most of all one of the West Indian operculated pulmonates, 

 such as Alcadia, while its exquisite nacre, its cancellated sculpture, its reflexed thickened lip, its 

 nacreous umbilical pad, and its perpendicular externally mucronated pillar, separate it in the 

 strongest way. Under these circumstances I have yielded to the strongly expressed opinions of 

 judges so trustworthy as Dr Kobelt of Frankfort and Mr Dall of Washington, and take this as the 

 type of a new genus. 



Gaza dcedala? Watson (PI. VII. fig. 12). 



Gaza dasdala, Watson, Prelim. Report, pt. 3, Journ. Linn. Soc. Lond, vol. xiv. p. 602. 



Station 174c. August 3, 1874. Lat. 19° 7' 50" S., long. 178° 19' 35" E. Kandavu, 

 Fiji. 610 fathoms. Coral mud. 



1 yd-la, treasure. 2 buibaXtic, variegated. , 



