368 Miscellaneous. 



MISCELLANEOUS. 



Ceratodus Forsteri and C. miolopis. \\y Dr. A. \\. Mkyek. 



Dr. GrxTHER separates, in his valuaMe memoir on Ceratodus (Phil. 

 Trans. 1871, part ii. p. 510), Cemtodus Forsteri, KrofFt, and C. mio- 

 lepis, Gthr., as two species, ehiefly hccause the former has 18 series 

 of scales, 5 above and 11 below tlie latenJ lines, the latter 21, 

 6 above and 13 below. The Koyal Natural-IIistorj- Museum of 

 Dresden possesses a specimen of Cerafodim from Gajndah, Bumett 

 River, Wide-Bay distiicl, (iueensland (procured through the Museum 

 CodefFroy of Hamburg), which has lO series of scales, 5 above and 

 12 below the lateral lines. It stands in this respect between the 

 supposed two species Ceratodus Forsteri, KrefTt, and C. miolepis, 

 Gthr. ; and I therefore presume that this character is in such a way 

 variable that a specitic chfference cannot be founded on it, and that 

 C. miolepis, Gthr., must be united with C. Forsteri, Krefft. The 

 specimen iu the Dresden Museum is about 93 centims. in length. 



On an Apparatus of Dissemination of the Gregarinse and the Stylo- 

 rhynchi ; and on a Remarkable Phase of Sporulation in the latter 

 Gentts. By M. A. Schneider. 



In the course of a revision of the group of the Oregarince, which I 

 undertook by the advice and under the auspices of M. de Lacaze- 

 Duthiers, besides numerous facts of detail reetifjing or completing 

 the ideas already acquired, I have met with some entirely new pe- 

 culiarities, of which I will give a brief resume. 



These observations are taken from the first part of a memoir on 

 the group of the Grcgarino', in which I give the history and descrip- 

 tion of the species which inhabit the Invertebrata of the environs 

 of Paris and the marine Invertebrata of the beach of Roscoff. 



It is well known that the Gregarinida, on attaining the termina- 

 tion of their individual growth, encyst themselves, and that at the 

 expense of their contents there are formed a considerable number of 

 reproductive bodies, designated under the names of " pscudonavi- 

 cella) " and " psorospermea?,*' which I propose to call simply 

 " spores," by an application of general nomenclature, M-ishing to ex- 

 press by this term that the bodies in question do not recjuire the 

 concourse of a male element in order to commence their evolution. 



From the existing data, the mature cyst opens by the rupture of 

 the integument and liberates the spores. A very remarkable excep- 

 tion to the general law is presented by the two genera Greyarina 

 and Stylorhi/nchus. But the mode of formation of this apparatus 

 had escaped me ; and its ascertainment was nevertheless exceed- 

 ingly important, both for the legitimation of the discovery and for 

 the sound interpretation of the organic arrangements which had 

 been proved. I have since been able to trace carefully the forma- 

 tion of this apparatus of dissemination ; and the following is the way 

 in which it is accomplished : — The cyst early shoMs, in its clear 

 marginal zone, the appearance of a variable number of tuVjes, cacli 

 directed in accordance with a radius of the cvsl. At fir.st without 



