24 THE NAUTILUS. 



sufficient material, and with such information as may tend to satis- 

 factorily solve all questions that may arise. By this means I might 

 hope to accumulate sufficiently ample and valuable information to 

 serve for the eventual publication of an up-to-date work on the subject. 



Yours truly, A. C. BILLUPS. 



PUBLICATIONS KECEIVED. 



NOTES ON PROSOBRANCHIATA, No. I, LOTORIUM. By H. 

 Leighton Kesteven. Proc. Linn. Soc. of New South Wales, 1902, 

 Pt. 3, pp. 443-483, pi. xvii. 



This interesting paper again brings before us the old genus Triton, 

 which, being pre-occupied, has long been abandoned in Mollusca, but 

 regarding a substitute there seems to be a very diversified opinion. 

 The author has gone thoroughly over the ground, adopting Lotorium 

 Montfort, as proposed by Harris (Catl. Tertiary Moll, in Brit. Mus., 

 Pt. 1, 1897). 



Montfort's names are the earliest that can be considered (Conch. 

 Syst., ii, 1810). Aquillus (type M. cutaceus Linn.) appears on page 

 579, and Lotorium (type M. lotorium Linn.) on page 583. The right 

 to amend Aquillus to Aquilus and to discard it on grounds of uncer- 

 tain etymology is questionable ; still its similarity to Aquila makes 

 the name less desirable than Lotorium, and as only a few pages in- 

 tervene between the two names, it seems a small matter to discuss, 

 still strict ruling would probably make Aquillus the generic name. 



The author does not agree with Dr. Dall and Simpson (Moll, of 

 Porto Rico, p. 416), who by elimination makes Septa Perry, 1811, 

 the type genus of the family Septidtz, and recognizing three other 

 genera, Ranularia and Lampusia Schumacher, 1817, and Lotorium 

 Montf. 



The author's statement that, " the whole of the species included 

 by Tryon in Triton (sensu strictu), Simpulium, Cymatium and Gut- 

 turnium, form one natural genus," is apparent to any one who has 

 made a study of all the species based solely on conchological char- 

 acters. 



From the figure of Perry's Septa rubicunda, and the habitat ". New 

 Holland" assigned, I should consider it T. australe Lam. and not T. 

 nodiferus Lam. The apices of twenty-nine species are described and 

 figured. C. W. J. 



