Cretaceous and Tertiary Cirr {pedes. 185 



1906. rn/h'cipes paronai, de Alessandri, Palseont. Ital. vol. xii. p. 248, 

 pi. xiii. figs. 1-9. 



Diagnosis. Capitular valves with closely set, somowliat 

 flattened, transverse and longitudinal ridges, tlic longitudinal 

 ridges ou the scuta and terga heing fine, wavy, and radiating 

 from the apico-hasal ridge. Scuta elongately triangular, 

 with a broad, flattened, steep-sided ridge curving from the 

 apex to tlie liasi-Iateral angle. Terga with the apico-ba^a! 

 ridge narrower than that of the scutum, almost straight ; 

 the a|)cx not at all incurved. 



Distribution. Oligocene (Aquitanian) : Chicri, Turin, Italy. 

 ^Miocene (Helvetian) : Colli di Torino, lialdisscro^ and 

 Scioize, Turin, Italy. 



Type. Prof. G. de Alessandri founded this species on 

 C'-irinie, scuta, and terga which are in the collection of 

 Count Luigi di Rovasenda, and of these I fix on the scutum 

 (Hgs. 8 a, b) as the holotype. Prof, de Alessandri sub- 

 sc(iuently figured similar valves, but among the carinse 

 included (11)06, pi. xiii. fig. 9) a rostrum of the species. 



Material. Count Luigi di Rovasenda and Prof. G. de 

 Alessandri kindly sent me the following valves of this 

 species : — 3 scuta, 6 terga, and 2 rostra. I am also in- 

 debted to Prof. C, F. Parona for allowing me to borrow the 

 two carinae and the rostrum (figured, Alessandri, 190f), 

 pi. xiii. figs. 7-9) which are in the Geological Museum of 

 the Royal University of Turin. 



Measurements. This is the largest species of the genus, 

 and Prof, de Alessandri gives the following measurements 

 for the valves described by him : — 



Length. Breadth, 

 mm. mm. 



Scutum 245 1;30 



Teiguui 29o 170 



Cariua 220 10-5 



The tergum here figured (PI. VII. fig. 3), when complete, 

 must have measured at least 30 ram. in length, and its 

 breadth is lU'2 mm. Prof, de Alessandii (1906, pi. xiii. 

 fig. 9) figures a rostrum as a carina, and this valve is 

 112 mm. in length and 74 mm. in breadth. The rostrum 

 here figured (PI. Vil. fig. 1) is broken at the apex, but its 

 length must have been at least 17 mm., and its greatest 

 breadth is 92 mm., even though the valve is broken at each 

 basal angle. 



Description of Valves. In this species the transverse ridges 

 terminatnig each zone of growth are closely and irregularly 



