Mr. A. Bell on the Crag- Fauna. 351 



radial origin for the flexor sublimis, and of a specialized flexor 

 pollicis longus ; but the presence of a third thumb-extensor 

 and the limitation of the extensor minimi digiti to the fifth 

 finger are tendencies towards the anthropoid disposition of parts. 

 The small and variable psoas parvus, the absent pyrami- 

 dalis, are interesting in consideration of the variability of 

 these parts in man, 5. In the lower limb the most decidedly 

 pithecoid features are the small size of the gluteus maximus 

 and its elongated insertion, the position of the semimembra- 

 nosus, the absence of a tibial head of the solajus and of the 

 peronseus tertius, and the doubling of the tibialis anticus. 



XLV. — Gontrihitions to the Crag-Fauna. Part IL* 

 By Alfeed Bell. 



Close research in some new sections and excavations that 

 have been made in the. Suffblk-Crag district during the past 

 autumn and winter has produced some very interesting results. 

 Upwards of fifty species of shells (some being undescribed) 

 new to our English Crags, and more than thirty species of 

 others which occur at different horizons to those known pre- 

 viously, have amply rewarded the efforts of my brothers and 

 self, the Red-Crag Polyzoa being also increased from fifteen 

 to thirty species. 



Species marked thus * signify the new additions ; the 

 others are simply new to the horizon to which they are re- 

 ferred. 



C. C, R. C, Norw. C, and Chil. scr. are used as contrac- 

 tions for the Coralline, Red, and Norwich Crags, and the 

 Chillesford series. 



Mammalia. 



^Balcena emarginata^ Ow. The only previously recorded 

 cetotolite from the C. C. (now in the Museum of Practical 

 Geology) was obtained by Col. Alexander, many years 

 since, and is of another species, probably B. gihhosa^ Ow. 

 C. C. Orford. Second examples of Castor veterior^ Lamk. 

 (an incisor), and Ziphius mediiUneatiis^ Ow., have been 

 lately obtained by myself in the Red Crag, 



Pisces. 



No list of Crag fishes having been published (probab^ 

 owing to the difiiculty of identifying the fragmentary portions 

 of the skeleton met with), I offer the following short one, 



* For Part I. see Ann. & INIag. Nat. Hist. Sept. 1870. 



9r,* 



