884 American Work on Recent Mollusc a in 1SS1. [November, 



those most interested, and the work has benefited in several cases 

 by the criticism and information thus elicited before its comple- 

 tion. The following new genera or subgenera are proposed : An- 

 cistrosyrinx, Bathymophila, Callogaza, Fluxina, Microgaza, Neilo- 

 nella and Turcicula. The family Pleurotomariidae is defined 

 from observations on the soft parts. About 150 new species are 

 described, many of which are liable to turn up or have turned up 

 in far distant regions. The genus Macrodon Lycett, hitherto 

 known as a fossil, furnishes a minute representative to the list. 

 The most numerous additions are in the Solenoconcha, Pleuro- 

 tomidae, Trochidae, Marginellidae and the genera Triforis, Neaera, 

 Leda and various opisthobranchiate groups. Among the. latter, 

 Atys? bathymophila (1. c. p. 98) has since proved to belong to the 

 (fossil) genus Sabalia. The synonymy of the genus Puncturella; 

 of Pleurotomaria (which is shown to be quotable as of Sowerby, 

 not, as usually, of Defrance) ; of Crepidula and of Gouldia, is 

 worked out. The latter is shown to be tenable as well as the 

 specific names given by Professor C. B. Adams, in spite of a con- 

 trary opinion which had been expressed by Mr. E. A. Smith, of 

 the British Museum, who had in his excellent review of the 

 genus, omitted to observe that the portions of D'Orbigny's Mol- 

 lusques de Cuba, in which his species of Gouldia (Adams) were 

 published, dates from later than 1846 (probably 1853); unlike 

 the earlier part, of which advance sheets were issued in 1 841-2. 

 The little Crassatellas, with which American conchologists are 

 more familiar under the name of Gouldia (like " Gouldia " mac- 

 traced) than they are with the more tropical type of the genus 

 (G. cerina Ad.), are hardly separated by any definite characters 

 from the typical Crassatella, though they were called Eriphyla 

 by Gabb. 



It may be well to call attention to the necessity for circum- 

 spection in describing these deep-water forms on which natural- 

 ists are working in several .countries, to point out that at least 

 two of the writer's species of Nesera, N. limatula and lamellifera, 

 have been redescribed subsequently as N. contracta and N. sena- 

 strigosa, by Dr. "Jeffreys, who, however, atones for his synonymy 

 by some excellent figures. Modiola lutea (Jeffr. MS.) Fischer 

 (Journ. de Conchyl., Jan., 1882), is without doubt identical with 

 Modiola polita V. and S. The wide range of many of these deep-sea 

 forms and their existence in a fossil state in Italian and Sicilian 



