1895.] M1C110SC0I>ICAL JOURNAL. 211 



Shell spiny ; pores of nearly equal size pyrifonnis 



133. DICTYOPHIMUS. 



Shell flat, pyramidal ; feet 2-3 times as long as the shell craticula 



Shell smooth, pyramidal ; feet 1-3 as long as the thorax lucerna 



Shell rough, pear-shaped ; feet with teeth on edges hamosus 



Shell smooth, pyramidal ; feet with tooth at the base tridentatus 



Shell thorny ; feet spiny, as long as the thorax pocillum 



134. LITHOMELISSA. 



Cephalis with 1 horn, shell smooth ; length of joints, 4:5 macroptera 



Cephalis with 1 horn, shell rough ; length of joints, 4:2 ehrenbergii 



Cephalis with 1 horn, shell smooth ; length of joints, 5:4 mitra 



Cephalis with 1 horn, shell papillate ; length of joints, 1:5 microstoma 



Cephalis with 2 horns, shell rough ; length of joints, 6:5 haeckelii 



Cephalis with 3 or more horns, shell smooth ; length of joints, 



4:3 corythium 



135. PSILOMELISSA. 



Shell rough, with obliterated collar stricture hertwigii 



136. SPONGOMELISSA. 



Shell of dense spongy structure, with a deep collar stricture..... spongiosa 



137. EUCECRYPHALUS. 



Shell campanulate ; peristome with 10-12 spines campanella 



138. LYCHNOCANIUM. 



Shell smooth ; feet little divergent, about as long as thorax continuum 



Shell pear-shaped, rough ; feet divergent, about as long as tho- 

 rax pyriforme 



Shell campanulate ; feet divergent, twice as long as thorax carinatum 



Shell pear-shaped, rough ; feet divergent, half as long as tho- 

 rax ventricosum 



Shell pear-shaped, nodose ; feet strongly divergent stout, about as 



long as thorax tribulus 



Shell inflated, rough ; feet twice as long as thorax, curved out- 

 wards falciferum 



Shell conical, tuberculate ; feet twice as long as thorax, striated, 



curved outwards hirundo 



Shell campanulate, rough ; feet twice as long as thorax, angular, 



s-shaped, or curved inwards sigmopodium 



Shell conical, smooth ; feet 4-5 times as long as thorax, s-shaped, or 



curved inwards trichopus 



Shell ovate ; feet 2-3 times as long as thorax, vertical tripodium 



Shell ovate ; feet shorter than thorax, nearly parallel cypselus 



Shell campanulate ; feet as long as thorax, nearly parallel crassipes 



