Weno and Pawpaw Formations 



71 



SUTURE : Similar to that of Ancycloceras lineatus Gabb 1 and Hamitet 

 quadrinodosus Jimbo.- Suture consists of medium sized siphonal lobe 

 small antisiphonal lobe, and large, nearly equal, first and second lateral 

 lobes and first and second lateral saddles ; the third lateral saddle is smaller. 

 Details of siphonal lobe indistinct; the next four elements are large, 

 slender, spreading, subequal, much dissected, primarily bifid, the subdivi- 



Fig. 2. Ancycloceras bendirei n. sp., suture of the type individual, camera lucida 

 drawing, x 5. SL Siphonal lobe; ASL Antisiphonal lobe. 



sions bifid, and the resulting inflections generally minutely trifid, some- 

 times bifid, at the tips. These four elements are subquadrate and sub- 

 equal. The third lateral saddle is smaller, laterally dissected and twice 

 bifid terminally. The antisiphonal lobe is about twice as tall as wide, 

 laterally dissected, and trifid terminally, the central prolongation being 

 the longest. 



This species is not closely similar to any known to me. It has some- 

 what the form of Hamites obstrictus Jimbo, but differs in having four 

 rows of prominent slender spines, and in the ribs, which are coarser and 

 more widely spaced. Superficially also it resembles in form Ancycloceras 

 matheronianum d'Orbigny (Neocomian), but differs from this species in 

 the suture, especially in the size of the siphonal lobe and the amount of 

 dissection of the lateral elements, in the diminished lateral ribs and in 

 the presence of spines throughout the length of the coil instead of tubercles. 



HAMULINA WORTHENSIS n. .p. 



PI. 2, figs. 23-26 



This fossil has two non-contiguous straight limbs united by a single 

 curve, and furthermore the suture has six lobes in all, like Hamulina hamus 



'Gabb, Geol. Snrv. Calif., Paleontology, vol. 2. p. 139, pi. xxiii, fig. 18c. 

 o, Pal. Abh., vi, 3, 1894. 



