368 Miscellaneous. 
MISCELLANEOUS. 
Ceratodus Forsteri and C. miolepis. By Dr. A. B. Meyer. 
Dr. Ginrner separates, in his valuable memoir on Ceratodus (Phil. 
Trans. 1871, part u. p. 516), Ceratodus Forsteri, Krefft, and C. mio- 
lepis, Gthr., as two species, chiefly because the former has 18 series 
of scales, 5 aboye and 11 below the lateral lines, the latter 21, 
6 above and 13 below. The Royal Natural-History Museum of 
Dresden possesses a specimen of Ceratodus from Gayndah, Burnett 
River, Wide-Bay district, Queensland (procured through the Museum 
Godeffroy of Hamburg), which has 19 series of scales, 5 above and 
12 below the lateral lines. It stands in this respect between the 
supposed two species Ceratodus Forsteri, Krefft, and C. miolepis, 
Gthr.; and I therefore presume that this character is in such a way 
variable that a specific difference cannot be founded on it, and that 
C. miolepis, Gthr., must be united with C. Vorsteri, Krefft. The 
specimen in the Dresden Museum is about 93 centims. in length. 
On an Apparatus of Dissemination of the Gregarinse and the Stylo- 
rhynchi; and ona Remarkable Phase of Sporulation in the latter 
Genus. By M. A. Scunerper. 
In the course of a revision of the group of the Gregarine, which I 
undertook by the advice and under the auspices of M. de Lacaze- 
Duthiers, besides numerous facts of detail rectifying or completing 
the ideas already acquired, I have met with some entirely new pe- 
culiarities, of which I will give a brief résumé. 
These observations are taken from the first part of a memoir on 
the group of the Gregarine, in which I give the history and descrip- 
tion of the species which inhabit the Tavertebrata 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 “ pseudonavi- 
celle’? and ‘‘psorospermeze,” which I propose to call simply 
“spores,” by an application of general nomenclature, wishing to ex- 
press by this term that the bodies in question do not require 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 Giregarina 
and Stylorhynchus. 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 shows, in its clear 
marginal zone, the appearance of a variable number of tubes, each 
directed in accordance with a radius of the cyst. At first without 
