994 PEOr, W. B. BENHAM OK THE [-^V^- 2, 



margin, and after a very short course is inserted into the dorsal 

 edge of the epiglottid cartilage at about the middle third ot its 



extent (figs. 18, 19). , ^ ,, i i ,. 



9. The hyo-epiglottid muscle has the usual relations. 

 1 o' The thvro-arytenoid is a small muscle arising from the inner 

 surface of the thyroid plate (PI. XXVII. figs. 18, 19, T.ar.) below 

 the thyro-epiglottid, and is inserted in the outer surface of 

 the enlarged base of the arytenoid cartilage, between the aryteno- 

 epiglottid and the lateral crico-arytenoid muscles. 



III. Note on the Laetnx or Zipsivs. 

 In 1887 a brief account of the external features and some parts 

 of the skeleton and viscera of a species of Ziphius was presented 

 to the Society by Professors Parker and Scott (Trans. Zool. Soc. 

 xii. p. 241). In it the larynx is stated to agree with that of 

 Cetacea in general, but no details or figures are given. 



The late Prof. Parker had the larynx cut into two symmetrical 

 halves, one half of which is amongst the many anatomical 

 specimens accumulated by him in the laboj-atory of the Otago 

 Museum, and it may be not without interest to add a brief 

 account of it here. It presents features of greater resemblance 

 to the Porpoise and Grampus than to Cogia (PL XXVIII. fig. 26). 

 The thyroid cartilage is continuous across the ventral surface, 

 though this region is thinner than elsewhere. The body of the 

 cartilage is otherwise like that of Cogia, but is stouter; the "bay" 

 between the posterior cornu and the body is wider and deeper ; 

 the anterior cornu (which has been cut across) is more distinct. 



The cricoid, on the other hand, is incomplete ventrally as in 

 several other Odontocetes ; its dorsal and lateral regions are much 

 stouter than the corresponding regions in the cricoid of Cogia. The 

 anterior border slopes backwards rather abruptly as it approaches 

 the ventral surface and meets the posterior border, which is 

 practically horizontal, in a blunt angle ; this angle nearly meets 

 its fellow below the thyroid. 



The arytenoids appear to be closely similar to those of Cogia ; 

 there is no independent supra-arytenoid cartilage such as occurs 

 in the Porpoise. 



The epiglottis has relations to the thyroid intermediate between 

 the conditions found in Balcenoptera and Cogia, a condition in 

 fact quite like that in the Porpoise. Its base rests against the 

 upper margin of the thyroid, instead of pushing its way downwards 

 between the two alae of that cartilage. I see no subepiglottid 

 cartilage. 



The chief purpose for which I examined this larynx was 

 with a view of ascertaining whether it presented any indications 

 of the " median sac " described in some other Odontocetes, but 

 there is no sign of this sac. 



The ridge, a cushion of the epiglottis, is continued be3'^ond the 

 cartilage in the form of a high membranous fold or septum, 

 subdividing this part of the laryngeal cavity into a deep right 

 and left pouch — much deeper than in Cogia — the lining of which 



