PLANARIANS FROM MAURITIUS AND RODRIGUES 151 
The intestinal coecum is coated internally with an epithelium 
made up, as usual, of high columnar cells, which near the junction 
point of the canal exhibit a close affinity for borax carmine ; in 
the cavity are contained spermatozoa enveloped i a coagulum 
of the secretion. This organ seems to me to serve as a seminal 
receptacle. 
Ag stated above, the present species closely resembles 
Am. tristriata described by Geba. But it differs from this 
in the arrangement of the parts of the genital organ. 
Norm upoN THE CANAL CONNECTING THE F’EMALF 
GENITAL ORGAN WITH THE INTESTINE. 
The peculiar canal connecting the female genital organ with 
the intestine is of somewhat frequent occurrence in other 
terrestrial planarians, as is the case with Rhynchodemus 
terrestris Mull., Rh. attemsi Bendl, Pelmatoplana 
mahéensis von Graff, and P. braueri von Graff. In 
Rh. terrestris, according to von Graff (12), the two ducts, 
one on each side, spring from the anterior parts of the seminal 
receptacle and take a course obliquely upwards and backwards, 
finally opening into the posterior trunk of either side. But 
these connexions appear to be inconstant im occurrence and 
arrangement, for on some occasions there exists, according to 
Bendl (2, 8, 5), a right connexion only, which is well developed. 
He has also placed on record a case of Rh. at temsi, in which 
the receptacle is in direct connexion with the left posterior 
trunk of the intestine, without passing by any distinct duct. 
According to Mell (20), the vagina in both P. mahéens is and 
P. braueri is continuous with a canal which communicates 
with the right posterior trunk of the intestine. 
An arrangement of this kind is also known to occur in other 
Turbellarian groups. Such are Oersted’s Phaenocora u ni- 
punctata, an Acoela (4, 5), and Haswell’s Enterogonia 
pigrans, a Polyclad (18, 14). In the former the receptacle 
communicates with the intestine by a short median duct, while 
in the latter the dorsal passage of the vagina, after receiving on 
