Ui 



Transactions. 



Kossmaticeras zelandicum n. sp. (Plate XXXIII, fig. 2.) 



Diameter, 75 mm. ; thickness, 27 mm. 



Last whorl only seen in the specimen for about half its extent. Ribs 

 large and distinct, some 36 being developed in the half-circle. The ribs 

 for the most part take their origin in tubercles situated on the border of 

 the umbilical wall. The tubercles are 10 in number in the half-circle. 

 There are a few ribs situated in the intervals between the tubercles. A few 

 additional ribs arise half-way between the umbilicus and the siphon. These 

 additional ribs are intercalated between those that arise on the umbilical 

 wall. The ribs are crenulated some twelve times between the tubercles 

 and the siphuncle. The suture-line is comparatively simple, and closely 

 resembles that of K. karpadense, and less closely that of K. bhawani 

 Stoliczka.* 



Tubercie 



Fig.. 2. — Suture- line of Kossmaticeras zelandicum. X 3. 



This species is closely related to K. antarcticum, described by Kilian 

 and Eeboul from Seymour Island, and to K. kalika Stoliczka from the 

 Arrialoor of India. From the former its ornamentation differs in its ribs 

 and tubercles being more numerous. On the other hand, the ribs and 

 tubercles are both less numerous than in the Indian species. These two 

 species are included by Kilian and Reboul in the subgenus Gunnarites. 

 There appears to be no doubt that the present species should be placed in 

 the same group, though it is sufficiently distinct to be regarded as a separate 

 species. 



In regard to the age that is indicated by the fossil the following statement 

 of Kilian and Reboul {lot. cit., p. 64) may be quoted : " Les faunes etudiees qui 

 appartiennent mcontestablement au type indopacifique du cretace superieur 

 (Neocretace) sont caracterisees par les Kossmaticeras." " Les assises cretacees 

 a Kossmaticeras antarcticum et Koss. bhavani de la terre de Graham, des iles 

 de Snow Hill et de Seymour se placent sensiblement au meme niveau que 

 des couches de Quinquina (Chili), les couches d'Algarobo, celles de Tejon 

 group en Californie, les couches superieures de Chico, les Phoenix and Henly 

 Beds dans l'Oregon, l'assise de Nanaimo dans la Colombie britannique, les 



* F. Stoliczka, Palaeontologia Indica, Cretaceous Fauna of Southern India, vol. 1, 

 pi. lxix, fig. 7 ; also Kilian and Reboul, Les Cephalophodes neocretacees, Wiss. Ergeb. 

 der swed. sudp. Exped. 1901-3, Bd. 3, Lief. 6, p. 22, 1909. 



