628 ON THE sTHL'CTLRi; OF THE LARVA], POLYPTERI 3. Dec. 17, 



Dimensions of the shall of Enhydrictis in millim. 



Basilar length (henselion) 99'0 



Upper length 97'6 



Cranial breadth behind zygomatic arches and 



above meat, audit 52*5 



Greatest breadth 66-0 



Breadth of occiput ca. GOO 



Interorbital breadth 28*5 



Breadth between procc. postorb 33*0 (!) 



Breadth between outer margins of alveoli of 



upper canines ea. 26'0 



Palate length ca. 54*0 



Length from anterior margin of alv. of upper 



canine to post, margin of alv. of m. 1 ... . ca. 32- 5 



Length of sagittal crest ca. 03-0 



Height of mandibular ramus between p. 1 



and m. 1 1 I/O 



1 conclude with a general remark on the Pleistocene Mammalia 

 of Corsica and Sardinia. They are essentially the same in both 

 islands and, with the exception of the Mouflon, 1 have not met 

 with a single recent species amongst the fossil forms. This is 

 as much as to say that, so far as the Mammals are concerned, I 

 cannot endorse the following statement by Deperet, referring to 

 the Corsican Pleistocene fauna : — " Le caractere quatemaire de 

 l'ensemble de cette faune ressort deja de la presence d'un grand 

 nombre d'especes actuelles, telles que le Loir, le Mulot, le Lievre, 

 le Mouflon de Corse, l'Aigle pygargue'". On this topic 1 shall 

 have something more to say at an early opportunity. 



Mr. Budget! read a paper on the Structure of the Larval 

 Polyptcrvs, in which he described th^ urino-geuital system and 

 skeleton of a very young larva 30 mm. in length. The following 

 is an abstract of this communication : — 



The pronephros, consisting of the greatly coiled anterior end of 

 the archiuepbric duct, Mas very large and lies close under the skin 

 on either side behind the gills ; the coiled portion of the pronephros 

 communicated with a small pronephric chamber at the side of the 

 dorsal aorta by a very fine duct, the extreme anterior end of the 

 archinephric duct. The chamber contained at this stage a very 

 small glomus and did not appear to communicate with the body- 

 cavity. The pronephros of Polypterus closely resembled that 

 of Amia. 



The mesonejphros in the hinder end of the bod)' was simple, 

 consisting in each segment of a glomerulus, from which there 

 passed a short broad nephrostome-canal opening into the rudiment 

 of the genital duct and a coiled kidney-tubule ending in the seg- 

 mental duct. 



1 Op. tit. p. 122. 



