689 
Host, Leptochirus edax Sharp var., a Staphylinid beetle. Det. Col. 
T. L. Casey. 
Average specimens, 50 u to 60 u. 
Habitat, intestine. 
Length of the protomerite 3,3 to 3,5 in the total length; width of 
the protomerite 1 to 1,5 in the maximum width of the deutomerite; 
maximum width of the deutomerite 2,3 to 2,5 in the total length. 
Protomerite somewhat oval, le der than long; region of 
maximum width near the middle; le marked off 
from the deutomerite. 
Deutomerite rather obconical; region of maxi- 
mum width in the anterior fifth, posterior to this ta- 
pering to the posterior third, where its width is less 
than half its maximum width; posterior third elongate 
and conical. 
Epicyte thin and rigid; sarcocyte thick over the 
entire gregarine, thinnest in the anterior portion of 
the protomerite and thickest in the posterior portion 
of the deutomerite; nucleus diameter equal to about 
one-fourth of the width of the protomerite. 
This gregarine was found in all of the specimens Figure 7. Stepha- 
of Leptochirus edax examined, but only a few speci- = I + oe 
mens in each host, in contrast to the large numbers 
of Stylocephalus ensiferus present in the same host. It is here referred 
to the genus Stephanophora for two reasons, the general shape of 
the gregarine and the fact that the host is a beetle, consequently the 
generic determination is uncertain. Neither cysts nor cephalonts of 
this species were taken so that further generic characters were not 
available. 
6. Uber Doppeldeckelbildungen bei Nassa mutabilis (Linné). 
Von Hans Leo Honigmann, Magdeburg. 
(Mit 3 Figuren.) 
eingeg. 16. April 1912. 
Uber Doppelbildungen des Operculums bei Gastropoden finden 
sich in der Literatur nur wenige Angaben. Zuerst wären hier zu er- 
wähnen, Jeffreys’ Beobachtungen bei Buccinum undatum (Linné) 
[1, S. 287 und 288], der als Monstrositäten bi- und trioperculate Tiere 
beschreibt, und zwar befand sich bei einem Exemplar das eine Opercu- 
lum auf einem stielartigen Auswuchse des Metapodiums, während das 
andre die gewöhnliche Form hatte. Bei einem andern standen die beiden 
Deckel in einem rechten Winkel zueinander. 
44 
