504 abstracts: zoology 



CRYSTALLOGRAPHY.— T'/ie simultaneous crystallization of calci e and 



certain sulfides of iron, copper and zinc. H. E. Merwin. Am. 



Jour. Sci. (4).' 1913. 



The study of three occurrences of the sulfides of ron and zinc has 



established the certainty of the deposition of marcasite and the strong 



probability of the deposition of wurtzite contemporaneously with calcite. 



The marcasite is d finitely oriented with regard o the calcite and also 



to accompanying pyrite. A close similarity between the crystallo- 



gra hie elements of pyrite and marcasite is shown. H. E. M. 



BOTANY. Le fruit mur et les jeunes semis de VAeglopsis Chevalieri. 

 Walter T. Swingle. Bull, de la Soc. bot. de France, 60:406- 

 409, Fig. A, No. 5, seances de mai-juin, Sept. 15, 1913. 

 As a supplement to the original description of Aeglopsis Chevalieri, 

 the structure of the ripe fruit and the mode of germination are described 

 in detail. The shell of the fruit is less woody than that of the other 

 genera of the hard-shelled group of citrous fruits with the exception of 

 Chaetospermum. The fruits are slightly pyriform at the base and often 

 show a low protuberance at the apex. The peel is brilliant orange- 

 brown. The membrane separating the cells is very thin, making them 

 triangular in shape. They are filled with large flattened seeds immersed 

 in a sticky transparent amber-colored aromatic fluid. The shell of the 

 fruit is made up of two layers, the brilliantly colored hardened glandu- 

 lar skin, and a woody layer, on the inside of which there are numerous 

 small glands. It is thought that these may secrete the sticky fluid sur- 

 rounding the seeds. A seven-celled fruit is figured in cross and longi- 

 tudinal section. 



The seeds germinate quickly and the cotyledons, altho they turn 

 green remain underground but near the surface. The first pair of 

 leaves are opposite, sessile and cordiform. There is also a second pair 

 of opposite leaves which are distinctly petiolate. This plant differs from 

 all others of the tribe Citreae hitherto studied in having this second pair 

 of opposite leaves. Maude Kellerman. 



ZOOLOGY. — A Revision of the crinoid family Mariametridce. Austin 

 HoBART Clark. Proceedings of the Biological Society of Wash- 

 ington, 26: 141-154. 1913. 

 The family Mariametridse, as here revised, includes six genera, Pontio- 

 metra, Oxymetra, Liparometra (nov.), Lamprometra (nov.), Dichrometra 

 and Mariametra, to which forty-nine described species are assigned. 

 The range of each genus is given, together with the reference to the 

 original description. A key showing the differential characters of the 

 genera is included. A. H. C. 



