306 Prof. M. Schultze on the Genus Cornuspira. 



P. scyhalarius were captured by Mr. Bewicke, amongst im- 

 ported shrubs, on the "green mountain," — being, moreover, 

 the only species which he obtained during a long day's research 

 in what would seem to be the most promising collecting-ground 

 of Ascension ! There can be no doubt that it is a naturalized 

 species, being an insect easy of transportation, and one which 

 has established itself at the Cape of Good Hope, the West Indies, 

 and in other distant localities. It agrees sufficiently well with 

 examples which I have taken at Madeira and the Canaries ; and 

 Mr. Janson, to whom I submitted it for comparison, remarked 

 that it was slightly larger than any of his British specimens, 

 and that the punctures on the elytra were perhaps a trifle deeper, 

 and the femora somewhat paler in hue, but that in all other re- 

 spects it agreed exactly with its more northern representatives. 



Such are the eleven Coleoptera captured by Mr. Bewicke in 

 this miserable island. The only other insect which he took is 

 one of which Ascension may be proud — the original Cimex 

 lectularius ! 



XXXVII. — On the Genus Cornuspira, belonging to the Mono- 

 thalamia; with Remarks on the Organization and Reproduction 

 of the Polythalamia. By Professor Max Schultze*. 

 The memoir of Williamson " On the Recent Foraminifera of 

 Great Britain," published by the Ray Society in 1858, induces 

 me to make some observations on the Rhizopod genus Cornu- 

 spira established by me. 



I have given this name to some previously unknown cal- 

 careous-shelled Rhizopods which appear to be very widely dif- 

 fused in many seas, and of which the shells exactly resemble 

 that of a small Planorbis. In my book " Ueber den Organismus 

 der Polythalamien" (Leipzig, 1854), at p. 40, 1 characterized the 

 new genus as follows : — 



" Shell calcareous, wound like a Planorhis-^eW, solid or 

 finely porous, disciform, similar on both sides, enclosing a simple, 

 undivided cavity." From the absence of any division into 

 chambers, therefore, the genus belongs to the Monothalamia, 

 which is the name that I give, in opposition to that of Polytha- 

 lamia, to those of the shelled Rhizopods (Foraminifera) in which 

 internal partitions, or indications thereof, are wanting. I also 

 described two species of this genus, Cornuspira planorbis and 

 C. perforata, and figured them in plate 4. figs. 21 and 22. 



* Translated by W. S. Dallas, F.L.S., from Wiegmaan's Archiv, 1860, 

 p, 287. 



