NASSA. 63 



N. BEATA {Loo Choo y.s.), N. QUANTULA (^7, Simon's Bay), N. 

 UKPOSTA {Sydney, N. S. W."^), N. pediculina {Hong Kong), N. 

 OPTATA {Sydney, K S. W.), N. spurca {St. Simon^s Bay), N. pli- 

 CATELLA {British Burmah), all of Gould. 



Most of the above are from the collections of the North 

 F^acific (U. S.) p]xploring Expedition: they have not been figured, 

 and the type specimens were destroyed in the great Chicago fire. 

 Some of them might be identified with other described species, 

 but it is better not to do so, I think, under the circumstances. 



N. NODiciNCTA {Galapagos Zx.~), N. corrugata {Eastern Seas), 

 N. AusTRALis ( Avs/rnlfn), N. orenicostata. X. scitula, all of 

 Arthur Adams. 



N. fuscoltneata, E. A. Smith. Japan. 



N. (C^sia) SIMPLEX, E. A. Smith. Uruguay. 



The following forty "species" are described (but not figured) 

 by Mr. F. P. Marrat, who does not believe in species. I take 

 them, with great pleasure, at his OAvn valuation, for I cannot 

 aftbrd to expend my time over diagnoses which should never 

 have been written by a gentleman holding such opinions as Mr. 

 Marrat does, as to tlie instability of every specific character. 

 Theoretically, Mr. Marrat relegates all the Nassse to one specific 

 form; practically, ho describes such individuals of that form as 

 he likes to name; and if every other collector should adopt his 

 views and be equally industrious, we should eventually have 

 every individual specimen of the genus bearing a distinct specific 

 name: moreover each collector would possess the sole specimens 

 of his own species. Xo locnlity is given with most of the 

 descriptions. 



X. nodosa {Malacca^ X. picturata, X. acuminata, X. lyr^.- 

 FORMis ( China', X. granulosa, X. lactea, X. grata (Canton}, 

 X. c^rulea, X.tabescens, X.crassicostata ( 5om6a?/ ),X.LAUTA 

 1 Malacca), X. quinquecostata, X. Hanleyana (Dunker has pre- 

 occupied the name:, X. parva, X. Sinensis Ghi:a SeasK X. 



OBLONGA, XrRUGOSA, X. SmITHII, X. CLARA, X. HARPULARIA, X. 



Abyssinica (Abyssinia , X. rotundicostata, X. bella, X. acu- 



TANGULA, X. UNDATA, X. PR.i;CALLOSA, X. MULTILINEATA (South 



Amp.rica), X. vincta, X. pura ( W. Indies). X. minor {Knben4a, 



