1888.] MR. F. E. BEDDARD ON A NEW GREGARINE. 35.T 



condition of tlie integument in Bidelphjs ; and I cannot find any 

 reasons tor believing that the integumental glands, which will shortly 

 be described, are any smaller in Didelphys than in Mijrmecobius. 



Apart, however, from the question as to whether the external 

 appearance of the glandular patch in Mi/nnecobius is really different 

 from that of Didelphys dimidiata, there is a close agreement between 

 the two species in the microscopic structure of the gland. The 

 sternal gland of il/^rmeco6jM« is a complex structure. The epidermis 

 in this region is greatly thickened and contains numerous sudoriferous 

 glands grouped together into oval masses. Beneath the dermis is a 

 large compound gland the structure of which resembles the sudori- 

 parous glands. 



In Didelphys dimidiata the elements entering into the formation 

 of the glandular patch are precisely the same as in Mynnecobius. 

 As in that species, there are a few hairs scattered over the surface of 

 the gland which are too small and too few to be recognized by the 

 naked eye. The same groups of modified sudoriparous glands as those 

 which I termed sudoriparous follicles in Mynnecobius occur in Didelphys 

 dimidiata. And, finally, underneath the dermis is a compound tubular 

 gland which, however, appears to be relatively smaller than in 

 Myrmecobius. 



To describe these various glandular structures more in detail is 

 unnecessary, as such a description would be a mere repetition of the 

 greater part of my paper upon Myrmecobius. 



It is interesting to find that there exists in both these genera, 

 which are not in other respects very nearly related, a glandular 

 apparatus having the same anatomical relations and the same 

 minute structure '. 



5. Note on a new Gregarine. 

 By Frank E. Beddard, M.A., Prosector to the Society. 



[Eeceived June 5, 1888.] 



The Gregarine described in the present note was found in a 

 Pericheeta which has recently been sent to me from New Zealand by 

 Mr. W. W. Smith. This species occurred in the vesiculce seminales 

 and in the body-cavity, and is a large Gregarine, reaching a length of 

 1^-2 millim. I observed three stages in the development of this 

 parasite, which I cannot identify "ith any described form. 



The smallest examples that I observed were about the same size 

 as the common Monocystis lumbrici, but of a different form, which 

 is illustrated in the accompanying woodcut. The body is globular, 

 and furnished with one or two slender processes usually of greater 

 length ; they are placed (if there are two) one at each end of the 

 body, so that the Gregarine has the appearance of a bead strung 

 upon a thread. I only observed individuals of this stage in the 

 vesiculae seminales. The body-cavity of the Perichceta was crowded 



1 P. Z. S. 1887, p. .527. 



