526 Mr. D. Sharp and Mr. F. Muir on the Comparative 



Eumorphus, sp. aff. iJrofani (PI. LXI fig. 113). 



Median lobe a strongly chitinised, irregular tube with the median 

 orifice at apex and the median foramen at base. On the ventral face 

 of median orifice project two large spines, the smaller one nearer the 

 orifice ; the orifice is closed by the folding over of a part of the 

 side of the internal sac. Tegmen consists of an irregular, chitinous 

 ring-piece in which there is no division between basal-piece and lateral 

 lobes. Internal sac complex, consisting of a large bilobed process at 

 the base of the sac, bearing several tufts of short, stout hairs, and 

 a small, tubular, invaginate portion, also bearing stout hairs. 



In Eurtiorphus, sp. aff. tetraspiloti^ the process (a) is trilobed and 

 is shown expanded in fig. 114 PI. LXI, the tubular portion (c) being 

 still invaginated and the armature at apex {h) is membranous. In 

 this species there is only one spine on median lobe, but the 

 projection of the lip is subspinose. 



Trochoideus dcsjardinsii (PI. LXX figs. 184, 184n'). 



Median lobe tubular with median orifice at apex and median foramen 

 at base, the ventral edge of the median orifice projecting beyond the 

 dorsal edge ; a deep constriction about one-third from the base. 

 Internal sac small, armature not examined. Tegmen forming a 

 large, nearly parallel-sided cap-piece on the dorsal aspect, the lateral 

 edges curving dorsally, envelojjing the sides of the median lobe, on 

 the ventral face is a thin curved strut. On each side of the caji- 

 piece, about one-third from its apex arise a bunch of curved hairs 

 which cling together and have the appearance of being free lateral 

 lobes. 



This form does not fit in with the typical Endomychids, 

 and should not be associated with them. 



The Endomychidae, through Endomychus coccincus, 

 show some affinity to such forms as Mycctaca, there being 

 a tendency towards the reduction of the tegmen to an 

 irregular ring-piece at the base of the median lobe, and 

 to a strong chitinisation of the irregular median lobe ; but 

 there is room for much discussion as to these Endoraychid 

 form?. 



Family MYCETAEIDAE. 



Form examined : Mycctaca hirta Marsh., England. 

 Fig. 115 PL LXI. 



31. hirta (fig. 115). 



Median lobe irregularly curved, laterally flattened and expanded 

 at apex, where the median orifice is situate ; median foramen at 



