I 



Mar. MGOCERAS Hi 



1911 



Genus, ANDROGYNOCERAS, Hyatt, 1867 

 1867, Foss. Ceph. ; Bull. Mus. Comp. Zool., V, 83. 



There are two sj^ecies quoted ; but it is advisable to take as the 

 genotype the one figured, which is Am. hybrida, d'Orbigny. 



Result 

 Genus, Androgynoceras, Hyatt, 1867. Genolectotj^ie, Am. 

 hybrida, d'Orbigny. 



Genus, LIPAROCERAS, Hyatt, 1867 



1867, Foss. Ceph. ; Bull. Mus. Comp. Zool., V, 83, 84. 



Three species are quoted in their order of sphseroconic development. 

 L. indecisum, Hyatt, is not figured ; L. henleyi and L. bechei both contain 

 different forms. A. henleyi and A. bechei, Sowerby, are probably the less 

 and more involute forms of Androgynoceras. Choice may then fall on 

 what Hyatt quotes as A. henleyi, Bronn (Leth. geogn. 1838, xxiii, 7) 

 which Bronn calls A. striatus, a copy of Zieten, 1830, v, 6. 



Liparoceras thus expresses the coarsely ornate, more tumid whorled 

 species, and Androgynoceras the less ornate, more compressed. 



Result 

 Genus, Liparoceras, Hyatt, 1867. Genolectotype, A. henleyi, 

 Hyatt pars=/4. striatus, Bronn, 1838, xxiii, 7. 



Genus, .EGOCERAS, Waagen, 1869 

 1869, Form. Am. siibradiatus ; Geogn. -Pal. Beitr., II (2) 247. 



As the name was proposed for the capricorns, the etymology, 

 .Egoceras =capricornus, indicates A. capricormts as the type. Haug (Rev 

 crit. Pal. 1900, 82) confirms. But A . capricornus, auctt., covers many 

 species, and what is exactly Schlotheim's species is very doubtful. 



A. planicosta ; d'Orbigny (non Sowerby) 1844, ''^^' recognised in 

 Waagen 's time (Oppel, Jurat. 156) as A. capricornus, is a good figure 

 to select for A. capricornus, auctt. 



The Capricorn stage is passed through by the last two genera before 

 bituberculation ; but there is a Capricorn fauna later than many of 

 their bituberculate (sphaerocone) species, indicating either cunctative 

 palingenesis (p. vii) of the costate stage, or survival of the less modified. 

 jEgoceras, then, may deserve generic rank as a separate stock, and it may 

 develop spharocones of its own, {A. nautiliformis. No. 37). 



Result 



Genus, ^goceras, Waagen, 1869. Type, A. capricornus; 

 Waagen et auctt., of which A . planicosta ; d'Orbign}', LXV, i, 2, = A. 

 capricornus, auctt. pars, is genolectotype. 



