462 Notices of Memoirs — Dr. E. von Mojsisovics — 



Verneuil and Karpinsky, such as Goniatites cydobus, Gon. post- carbon- 

 narius, and Gon. prce-permieus, may be very closely related to Norites. 



Lttoceratid^. 



Monophyllites. — Lytoceras sphcerophyllum and Lyt. Morloti are to 

 constitute a genus distinct from Lytoceras on account of the peculiar 

 form of their lobes. 



Phylloceras, Suess. 



Aegocerattdje. 



Aegoceras, Waag. — This generic denomination may provisionally 

 be reserved for a number of forms from the Mediterranean Muschel- 

 kalk, and further researches must decide how far it is to be super- 

 seded by that of Psiloceras, Hyatt. 



Tropitid^. 



This family is nearly related to the Arcestidce, and distinguished 

 by a well-developed system of sculpture, and by the length of its 

 inhabited chamber, extending over a whole whorl. The rugose 

 stratum has only been observed in the genus Halorites. 



Tropites, Moys. — This genus includes the manifold forms allied to 

 Trop. svb-bullatus, Hauer; Trop. Jokelyi, Hauer; and Trop. costatus. 

 Some of these forms show spiral undulated lines similar to those of 

 some Goniatites, whose external form reminds us of Tropites. 



Entomoceras, Hyatt. — The American type of this genus, Entom. 

 Laubei, Meek, stands extremely near to the group of Ammonites 

 Sandlingensis, Hauer [Entomoc. Tlieron, Dittm., etc.), which group is 

 nearly allied to Tropites. It is characterized by a flat compressed 

 shape, a high cultriform carina, aberrant lobes, and, in some cases, by 

 the presence of a number of spines, reminding us of Trachyceras. 

 Length of the inhabited chamber still unknown. 



Halorites, Mojs. — Includes the group of Halorites Bamsaueri, 

 Quenst., characterized by a body-chamber and mode of growth 

 similar to those of Arcestes, sculpture like strings of pearls on the 

 inner whorls, and high saddles with many lateral branches. Lateral 

 lobes reduced. Whorl of the inhabited chamber different in shape 

 and sculpture from the inner whorls. Margin of the mouth with a 

 slight stricture. Aberrant forms: Hal. semi-plicatus, Hauer ; Hal. 

 decrescens, Hau. ; Hal. semi-globosus, Hau. : and Ammonites Medley- 

 anus, Stol. 



Juvavites, Mojs. — Comprises the groups of Juv. Ehrlichi, Hau. ; 

 and Juv. alterni-plicatus, Hau. Near to Halorites ; different from 

 this genus by the similitude of the whorl of the inhabited chamber 

 with the inner whorls, and by the lobes being less slitted. Periodical 

 constrictions of the shell are frequent. 



Distichites, Mojs. — Convex portion with a channel-like depression 

 in the middle, frequently with smooth carinas along the margins. 

 Inner whorls, save the double carina, similar in sculpture to those of 

 Tropites Joleelyi. Outer whorls gradually flattening; the outer range 

 of spines advancing to the middle of the sides, where also the ribs 

 increase in number by bifurcation and intercalation. Inhabited 

 chamber extending beyond a whorl. Lobes similar to those of 



