NAS8A. 68 



X. BEATA (Loo Choo /$.)', X. QUANTULA (St. Simon' s Bay), X. 

 KEPOSTA (Sydney. N. S. W. ?), N. PEDICULINA (Hong Kong), X. 

 OPTATA (Sydney, N. S. W.), X. SPURCA (St. Simon's Bay), X. PLI- 

 CATELLA (British Burmah), all of Gould. 



Most of the above are from the collections of the North 

 Pacific (U. S.) Exploring 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. 



X. NODICINCTA (Galapagos ZO, N. CORRUGATA (Eastern Seas), 

 X. AUSTRALIS (Australia), X. ORENICOSTATA, X. SCITULA, all of 

 Arthur Adams. 



X. FUSCOLTNEATA, E. A. Smith. Japan.. 



X. (C^ESiA .. SIMPLEX. E. A. Smith. Uruguay. 



The following forty ki 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 own valuation, for I cannot 

 afford to expend my time over diagnoses which should never 

 have been written l>y a gentleman holding such opinions as Mr. 

 Marrat docs, as to the instability of every specific character. 

 Theoretically. Mr. Marrat relegates all the Xassse to one specific 

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

 lie 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 collect or would possess the sole specimens 

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

 descriptions. 



X. NODOSA (Malaga). X. pirn HATA, N. ACUMINATA, N. LYR.E- 

 FORMIS ( China , X. UKANI LOSA. M". LACTEA, N. GRATA (Canton . 



N. C^RULEA, N.TABESCEXS, X. CRASSICOSTATA ( #0mfou/ ),N.LAUTA 



' Malacca], X. QUINQUECOSTATA, X. HANLEYANA (Dunker has pre- 

 occupied the name , X. PARVA, X. SINENSIS : Chi-ia Seas\ X. 



OBLONOA, X. RUGO8A. X. SMITHII, X. CLARA, X. HARPULARIA, X. 



ABYSSINICA i Abyssinia , X. ROTUNDICOSTATA, X. BELLA, X. ACU- 



TAXtiL'LA, X. UXDATA, X. PR^CALLOSA, X. MULTIL1NEATA (Soufh 



America.), X. VINCTA. X. PURA ( W. Indies). X. MINOR (Kabenda, 



