226 Zoological Society : — 



foveolato, disco trittihercxdato ; tihiis fosteriorihus Unearihus, 

 nigro-fuscis ; scnfis rentralibus segmenti qvurti quintique suh- 

 quadratis. — Fem. 

 Long, a fronte ad apiceni segmenti secundi abdominis 2\-Z^ mill. 



Genus Spirachtha. 



Maxillce mala interiori cornea, uncinata. Palpi maxillares 2>-arti- 

 cuIatL Ligida nmpla, rotundata, paraglossis obsoletis. Palpi 

 lahiales '6-articulati, minutissimi, verniciformes, ligida super- 

 tecti. Tarsi 4-articulati, posteriores articulo primo s2ibelon~ 

 gato. Abdomen membranaceum, maximum, fractum ; parte 

 anteriori articuli secundi glohosa ; parte posteriori jixa, conica, 

 anterius ascendente, fj-ibusque utrinque munita appendicibus 

 membranaceis, jiliformibus, hiarticulatis. (^neipaxdijs.^ 



Spirachtha EuRYMEDUSA. Albissima, membranacea; antennis, 

 capite, scutis thoracicis et abdoininalibus pedibusque corneo- 

 membraneis, pallide fuscis, coxis, /emorv.m basi, trochanteribus 

 jiosticis tibiisque fuscis, oculis fusco-nigris. — Fem. 



Long, a froute ad apicem segmenti secmidi abdominis 2 mill.; lat. 

 segmeuti secundi abdominis 1 mill. 



November 8. — Dr. Gray, Vice-President, in the Chair. 



On the Anatomy of the Walrus. 

 By Professor Owen, F.R.S., F.Z.S. etc. 



Professor Owen communicated the chief results of his dissection 

 of the Walnis {Trichecus rosmarus) which died at the Gardens of 

 the Zoological Societ}-, October 18.33. The author prefaced his ana- 

 tomical description by some remarks on the physiognomy, attitudes 

 and movements of the living animal ; and more especially dwelt on 

 the superior strength of its fin-shaped limbs, as compared with the 

 ordinary Seals, the Walrus being able, when it moves on dry land, to 

 raise its trunk from the ground — in other words, to walk — a mode of 

 progression which strikingly contrasts with the awkward shuffle of 

 the Seal, as it trails its belly on the earth, aiding its fore fius with 

 the action of its powerful abdominal muscles. Both the bones and 

 muscles of the fins of the Walrus are more powcrfulh' developed than 

 in the Seal, and this, the author concluded, had reference to its 

 natural habitat among bergs and floes of ice, and the necessity of 

 clambering among and over their rough, irregular surfaces. The 

 sex of the animal dissected was female ; the mammae were four in 

 number, two abdominal and two inguinal. There was no trace of ex- 

 ternal ears. The eye is defended by a circular external eyelid, and 

 by a broad thin membrana nictitans ; there is a small Harderian, or 

 inner lacrymal gland, but no true lacrymal gland, punctum lacry- 

 male, nor ductus ad nasum. The subcutaneous cellular tissue was 

 very coarse, tough and elastic, almost granular to the touch, and re- 

 sembling a corjms cavernosmn. The disposition of the peritoneum 

 and of the viscera of the abdomen was minutely described, and it was 



