Miscellaneous. 231 



Dr. Hoyle's ' Diagnostic Key to the Genci'a of Recent Dibrau- 

 cliiate Cephalopoda ' is necessarily extremely technical, but it will, 

 without question, prove invaluable to those desiring to identify 

 adults of this group. 



"We venture to think the prices charged for the papers by Dr. Hoyle 

 (one shilling and sixpence) and Mr. Eolton (one shilling) a little 

 high, at least ■when compared with the wonderful shillingsworth 

 provided by the authorities of the Natural History Museum at 

 S. Kensington. But probably the authorities of the Manchester 

 [Museum cannot afford to publish these handbooks at a loss, or 

 at least with but an infinitesimal profit ! 



MISCELLANEOUS. 



On a Marine Pseudoscorpion from the Isle of Man. By A. D. Imms, 

 B.Sc. (Lend.), Zoological Laboratory, University of Birmingham. 



About the shores of Port Erin Bay, during August 1904*, I came 

 across a species of pseudoscorpion which frequented the rocks about 

 halfway between the limits of high and low tides. The fact of this 

 being so unusual a habitat for an animal belonging to this order 

 led me to make a careful search for it, but it resulted, however, in 

 my obtaining only five individuals. They were found to agree in 

 all respects with Ohisium viaritiminn, Leach, and 1 am indebted to 

 the llev. 0. Pickard-Cambridge, F.ll.S., for confirming my identifi- 

 cation of that species. 



Four of the specimens were found deep in the crannies and 

 fissures with which the slaty rocks of the locality abound, while the 

 fifth example was met with in the act of crawling over the rocks 

 and weed. The first specimen was obtained while searching for 

 the eggs of the marine Collembolan Annrida maritima. To dis- 

 cover the latter it is necessary to be provided wnth a stout hammer 

 and chisel in order to split open the fissures in the depths of which 

 they are deposited. In the recesses of these fissures there are to be 

 found, in addition to the pseudoscorpion, adults oi Anurida mari- 

 tima, larvfE, pupic, and imagines of the Coleopteron Micrahjmma 

 brevijyenne, and numerous individuals belonging to a species of an 

 Acarns, which I have not yet been able to determine. It is probable 

 that the Ohisium preys upon the Collembola and most likely upon 

 the Acari also. When alarmed or irritated, it was observed to run 

 iibout actively in both a forward and backward direction with out- 

 stretched pedipalps, but it was not seen to run sideways, as is known 

 to be the case with some pseudoscorpions. 



The nature of the habitat of Obisiam and of the other Arthropods 

 associated with it is such that they have to endure submersion 

 twice every twenty-four hours. Unlike Annrida (or, according to 

 Laboulbene, Micralymma), Ohisium has no efficient hairy covering 



* While occupying the talle rented by IMrmingliam University at the 

 Biological Station, Port Erin. 



