552 Mr. D. Sharp and Mr. F. Muir on the Comparative 
basal-piece of the cap consists of a large sclerite, broader at the base 
where it curves round the sides of the median lobe. Internal sac 
apparently elongate. 
This type is near to Pytho. 
Family MONOMMIDAE. 
Forms examined: Monomma gigantewm Gueér., Angola; 
and sp., Penang. 
Figs. 174 and 174a Pl. LXIX. 
M. gigantewm. 
Median lobe long, thin and tubular; chitinous round the tip (a), 
with dorsal and ventral face supported by chitin strips. Internal 
sac undifferentiated. Lateral lobes large, joined together on the 
ventral aspect by a semi-chitinous connection, the tips truncate. 
Basal-piece half as long as the lateral lobes, forming a curved sclerite 
on ventral aspect. Fig. 174 is rather too broad. 
M., sp. ?, Penang, is similar to M. giganteum. 
We place this type with Stenosis and Zopherosis on 
account of the ventral orientation of the tegmen. 
Family MELANDRYIDAE. 
Forms examined: Orchesia micans Panz., England. 
Phloeotrya rufipes Gyll., England. Melandrya caraboides 
L., England. 
Figs. 175, 176, and 177 Pl. LXIX. 
Orchesia micans (Pl. LXIX fig. 175). 
Median lobe long, thin, straight and membranous, supported by a 
chitin rod on each side, which flattens out at base and forms a pair of 
struts (ms). Tegmen consisting of a well-developed basal-piece 
produced to a long point in front («), witha pair of long, thin lateral 
lobes. Internal sac undifferentiated. 
Phioeotrya vufipes (Pl. LUXIX fig. 176). 
Median lobe very long and thin, supported along each side by a 
thin chitinous rod (a), these project at base as two struts (ms) ; 
median orifice at apex. Tegmen forming a short sheath, open at 
apical two-thirds (b) on ventral face, and produced into a long, 
narrow, parallel-sided, basal sclerite on dorsal face. Internal sac 
undifferentiated. 
Melandrya caraboides (Pl. LXIX fig. 177). 
Median lobe fairly short, membranous, supported on each side by 
