Quarterly Journal of Coiichology. 375 



N. gciniiiulaia is an exceedingly variable species, hardly any 

 two specimens being exactly alike. 



N. variabilis is also shown to be very variable and to include 

 several species at one time considered to be quite distinct. 



The linking of Nassa with other genera is next discussed, 

 examples being named of an approach to Rissoa in N. rissoides, 

 to Phos in N. pallida; N. plicosa is allied to Sfrongyloceras. N. 

 ohliqua to Neritula^ N. tritoniforinis to Ranella, &c. 



This contribution by Mr. Marrat to our knowledge of the range 

 of variation in the Nassau, of which genus he has made a speciality, 

 is important to all Conchologists who are interested in this 



fascinating branch of study. " 



J. W. T. 



The Mollusca of the Firth of Clyde.— By Alfred Brown.* 



The molluscan fauna of the estuary of the Clyde has for a 

 long time past received a considerable share of attention from 

 many eminent conchologists, partly on account of its intermedi- 

 ate position between the northern and southern provinces, and 

 therefore harbouring many species which reach their most southern 

 or northern limit in its waters, and partly on account of the nu- 

 merous bays and lochs in which collecting may be carried on in 

 almost all weathers, the great facilities for travelling and the 

 beauty of the scenery have also no doubt tended to render this 

 estuary a favorite hunting ground. 



As might be expected several lists of the molluscan fauna 

 have been published at various times by different investigators, 

 but no reliable one has been published in recent years having the 

 same scope as the very excellent catalogue now before us (the one 



* Glasgow, 1878, royal 8vo., 130 pp., price 5/-. Hugh Plopkins, 85, 

 Renfield Street. 



