ENTOZOA INDIGENOUS TO IRELAND. 343 



The ribs are fourteen in number on each side ; the first 

 being double-headed, is attached to the two first dorsal ver- 

 tehne, the rest are each attached to the posterior edge of the 

 transverse process of the corresponding dorsal vertebra. 



The pectoral fin, &c., is analogous to the superior extre- 

 mity of the human subject, consisting of a scapula, with its 

 glenoid cavity, the os humeri, the fore-arm, with its two 

 bones {radius and ulna), the carpus, metacarpus of four 

 bones and four fingers, with their phalanges. 



The point of the underjaw projects, in the skeleton, one 

 foot beyond that of the upper ; tJEiey are both pointed, but 

 were rounded off in the recent subject. 



Two small flat bones, representing the pelvis in quadru- 

 peds, were attached (one on each side) to the first caudal 

 vertebra. 



The intervertebral substance consists of myriads of elastic 

 columns or pillars ; an admirable and exquisitely beautiful 

 piece of mechanism, combining flexibility, elasticity, and 

 strength. 



The seven last bones of the vertebral column are deeply 

 impressed laterally with pits or hollows, for the attachments 

 of the rays or fibres of the horizontal tail. 



From the discrepancy as to the number of vertebrce, &c., 

 I am of opinion that this species has not been described 

 before, and I have proposed for it the name Balcenoptera 

 tenuirostris. 



2ith March, 1840. 



Art. VII. — Catalogue of the Entozoa indigenous to Ireland ; with 

 Obsermtions. By O'Bryen Bellingham, M.D., Member of 

 the Royal College of Surgeons in Ireland, of the Natural-History 

 Society, the Zoological, and the Geological Society of Dublin, 



&C., &C.1 



One of the objects contemplated by the Natural-History So- 

 ciety of Dublin on its formation, was to obtain, at as early a 

 period as circumstances permitted, a complete catalogue of 

 the animals, vertebral as well as invertebral, which are natives 

 of this country. With the wish to contribute as far as hes in 

 my power to so desirable an object, I have brought forward 

 the following catalogue of Entozoa, or parasitic animals (a 



* Read at a Meeting of the Natural -History Society, June 5, 1840. 



