'M THE XAUTILUS. 



their hosts. By " domiciliares " are meant creatures which live 

 upon or burrow in shells, " not for the purpose of getting at the softer 

 jjarts of the niolhisk upon whose shell they have 'squatted,' in order 

 to use said soft parts for food, but solely for the jnirpose of a 

 residence or domicile." Such are the pholads (Penetella) which 

 stake out their mining claims on the Haliofis ritfescens. But most 

 •extraordinary of all is the case of certain little fishes of the genera 

 Fierasfer and OUgocottus. These little felloAvs enter the gaping shell 

 of ^leleagrina, impelled I suppose by greed for a meal or perhaps 

 by a Pandora-like curiosity to see what is within the rough valve-lid. 

 Once inside they " find no obsti-uction to their course as they push 

 their way towards the interior between the mantle and the smooth 

 inner surface of the valves until they ap])roach the adductor muscle, 

 and here they find a barrier which causes them to expend somewhat 

 greater activity or energy, and in a corresponding degree disturb the 

 jserenity if not the structural economy of the oyster." And here the 

 explorer is "entombed in pearl." Three ])lates accompany the paper, 

 showing the struggling, tired, little minnows as neatly over laid Avith 

 pearl as Chinese josses inside a DijJsas shell. OUgocottus has not 

 previously been observed caught in this way. — H. A. P. 



An excellent list of Rhode Island 3Iollusks by Mr. H. F. Car- 

 penter has been received, and will be commented upon in the August 

 Nautilus. 



MoLLuscA OF ^Minnesota, by Uly S. Grant. Another brief 

 contribution to a knowledge of ^Minnesota Mollusks appears in the 

 recently issued report of the Minn. Geol. and Xat. Hist. Survey. It 

 includes notes on thirteen forms not before recognized in the State, 

 ■besides additional remarks on sj)ecies previously noted. It is under- 

 stood that Mr. Grant will shortly have ready a revised annotated 

 •catalogue, bringing together the matter already published, and iu- 

 •corj^orating also notes on the material acummulated during the 

 progress of the Survey. His personal field work during several sea- 

 sons in the northern and other unfrequented, portions of the State has 

 no doubt brought to light many important facts. — C. B. KEYES. 



