56 ICHTHYOPTERYGIA. 



slender, and glenoid cavity of pectoral girdle relatively smaller. The 

 length of the cranial rostrum appears to be always less than three 

 times the longer diameter of the orbit. 



This species does not appear to have attained such large dimensions 

 as /. communis ; the length of the largest known individuals being 

 about seven feet. "While /. communis seems to be the common form 

 at Lyme-Kegis, the present species seems to be the more abundant 

 at Street. 



The above-mentioned characters are exhibited not only by the 

 under-mentioned specimens, but also b\ the skeletons marked 1, 2, 

 and 12, on page 138 of Seeley's ' Index to Aves &c. in Cambridge 

 Museum ' (1869), which the writer has satisfied himself by personal 

 observation belong to this species. The narrower paddles and the 

 notching of the anterior border of some of the bones of their first 

 row indicates that this species connects i". communis with the 

 Longipinnate group. This species is recorded both from the Upper 

 and Lower Lias. 



Hah. Europe (England and (?) Wiirtemberg). 



2013 *. Slab showing an oblique view of the dorsal and right lateral 

 (Fig.) aspects of a large skeleton ; from the Lower Lias of Street, 

 near Glastonbury, Somersetshire. Figured by Hawkins 

 in his * Sea Dragons/ pi. xvii. ; and also by Owen in his 

 'Liassie Beptilia' (Mon. Pal. Soc), pt. iii. pi. xxx. figs. 

 1, 2. The skull and limbs are well preserved. The 

 pectoral has six, and the pelvic limb four longitudinal 

 rows of phalangeals. The notches in the tibiale and 

 adjacent tarsale of second row are well shown ; as also 

 are those in the anterior phalangeals of the pectoral limb. 

 There are three bones in the second row of the tarsus. 

 The pelvic and caudal region is figured by Owen in the 

 4 Trans. Geol. Soc.' ser. 2, vol. v. pi. xlii. The right limbs 

 of this specimen are represented in the accompanying 

 figure. Hawkins Collection. Purchased, 1834. 



14565. Slab exhibiting an oblique view of the dorsal and left 

 (Fig.) lateral aspects of a large skeleton ; from the Lower Lias 

 of Street. Figured by Hawkins, op. cit. pi. xx. The 

 skull and both pectoral limbs are almost perfect ; but only 

 the left one of the pelvic limbs remains. There are five 

 rows of phalangeals in the pectoral paddle. The notch in 

 the tibiale is well shown ; and there are four bones in the 

 second row of the tarsus. Hawkins Collection. 



