Mr. G.J. Arrow un the (itnus RliysoJes. 83 



orgaiiidm was not accom|mriieJ by any fif^ure. By referring 

 to my description of this foracninifer tVoni Funafuti*, it will be 

 seen that it [)lay.s a very itn|ioitant part in the formation and 

 consolidation of reel-rocks, and under certain conditions forms 

 calcareoui nodules as large as or larger than a pigeon's egg by 

 continuous laminar growth. The young form of these extra- 

 ordinary developments, however, resembles the Polj/trema 

 planum of Carter. ^ly object in writing this note, therefore, 

 is to withdraw the name invulva in favour of P. pltnum. 



The various forms of Po'ijtreina are not alone in making 

 encrusting growths and noilules, for other well-known ad- 

 herent foraminit'era, such as G/psina and Curpenteriu, uncraAt 

 and enclose organic particles until they produce more or le« 

 sphseroidal and elliptical no lules of considerable size; and 

 these I hope to deal with shortly. 



XIV. — Remarks upon the Oenus Rhysodes, toilh Descriptions 

 of some new Oriental Species. \^y GILBERT J. AUHOW. 



The small Coleopterous family Rhysodidse, the known species 

 of which are fast becoming numerous, has been separated into 

 various genera according to slight characters, many of which 

 will probably be found insafficient as new forms occur. They 

 will, however, serve for present purposes, if some agreement 

 can be arrived at as to their relative value. The confusion 

 arising from the want of such agreement was largely dispelled 

 by ^Ir. George Lewis, who published in iy8{> a list of the 

 known species. Uis views, however, have not been entirely 

 adoj;ted abroad, while the adoption of his genus Epiglymmius 

 and another (^lihysodiastes) jsince proposed by Fairmaire 

 necessitate, in uiy opinion, the formation of several more for 

 species exhibiting equally good differential characters. 

 Since commencing this paper 1 iiave learnt tliat M. Grouvelle 

 contemplates the publication of a monograph on the family; 

 and since he has more complete materials than myself, I have 

 reduced my original intention to that of a partial review of 

 the genus Pliysudes alone. I shall accordingly leave generic 

 questions entirely to that entomologist, and in the list of 

 8peci(3 which follows 1 include all the forms known tJ me 

 which arc distinguished by the possession of wings and the 

 external conformation which accompanies that condition. 



• Journ. Linn. Soc. Lond., Zool vol. xxviii. (1900) pp. 1 and 17, pi. ii. 

 fig. 3, and ttxt-%. 2. 



6* 



