1870.] Ml [Ball. 



nomenclature of the species, is indicated by an interrogation point. 

 The sources from which the new arrangement has I been principally 

 compiled are the works of Troschel, Von Marteg, Morse, Gray, 

 Adams and others, as arranged in the classification of the families 

 of the Mollusca, provisionally adopted by the Smithsonian Institu- 

 tion ; for the use of which I am indebted to Prof. Theodore Gill. The 

 authorities given for the larger groups are usually those who have 

 restricted them as at present understood, and not the original authors 

 of the names in a wider sense. The writer is aware that many mod- 

 ifications may be required as science progresses, but he hopes that 

 even in its present and probably imperfect state, the adoption of the 

 present more natural arrangement will be of value to students of 

 malacology. 



SUB-KINGDOM MOLLUSCA Cuv. 



Class CEPHALOPODA. 



Order Dibranchiata Owen. 



Suborder Decapoda. 



LOLIGUSTIDjE H. & A. Ad. ONYCHOTEUTHID.E H. & A. Ad. 



Loligo Lam. Ommastrephes D'Orb. 



L. punctata, p. 513. L. Peaiii, O. sagittatus? p. 510. O. 

 'p. 514. Bartrami, p. 512. 



CRANCHIID.E Stp. SPIRULIDJE H. & A. Ad. 



Taonus Steenstrup. Spirilla Lam. 



T. pavo, p. 509. S. fragilis, p. 516. 



Class GASTEROPODA. 



Subclass DTCEC A. 



Order Toxoglossa Trosch. 



pleurotomid^e Trosch. ularia, p. 352. B. violacea, 



--. ,. T i p. 353. B. decussata, p. 354. 



Mangelia Leach. * '* 



, T .-, -, • ,~ B. cancellata and pleuroto- 



Mr* bicarmata, p. 349. . r 



Ai- xi n„ r< maria, p. 355. 



Clathurella Ger. ' x 



C. plicata, p. 350. admetidjs Trosch. 



Bela Leach. Admete Moll. 



B. turricula, p. 351. B. harp- A. viridula, p. 391. 



PROCEEDINGS B. 8. JT. H.— VOL. XIII. 18 APRIL, 187D. 



fru 



