blow which i delivered by the ' rword.' But the prefrontals manifest more extensively this 

 peculiar cellular structure, which Curier well says, " Too preudrait presque pour Ira cvllule* 

 de lYthnnmlr d'un quadruped*." 



J/w. Brit. 



251. The lower jaw of a Sword-fish, showing the rasp-like disposition of the minute 



teeth upon its alveolar borders. Mm. firif. 



252. The skeleton of the Rote-coloured Dory (Zewt roteui, Lowe). 



The parapophyse* are drrrloped, and form haemal arches from the fifth, sixth, seventh, 

 eighth, ninth and tenth abdominal vertebne ; the eleventh arch articulates with a long anterior 

 intertucmal spine, which forms the posterior boundary of the abdominal cavity, and indicate 

 the first caudal vertebra. The stylohyal is articulated to the junction of the epitympanic anil 

 mtHA) inpinii ; the ceratohyal is much expanded, of a subquadrate form ; the glossohyal is 

 of great length ; the urohyal is of great breadth, and bent upon itself upwards on each side, 

 forming a concavity towards the branchial arches articulating with part of the extremity of 

 the eeratohyal. The number of abdominal vertebrae in this skeleton is 1 1 ; that of the 

 caudal vertebne 21, =3'.'. 



Presented by Ute Rev. R. T. Lowe, M.A., F.L.S. 



253. The skeleton of a Dory (Zeiu/aAer). 



The mouth of this fish being remarkably protractile the tympanic pedicle is of great 

 length, and the nasal processes of the premaxillary surpass the alveolar ones in length : they 

 play upon a smooth concavity above the nasal and frontal bones. The expanded summits of 

 the interueural spines form broad and irregular osseous scales on each side the origin of the 

 dermoneural spines. The same modification is repeated with the intertuemal spines below, 

 and a chain of homotypal osseous scale* is continued from the first caudal interhaemal spine 

 to the pelvic bones, and from these to the urohyal bone. The parapophyses begin to be 

 . developed at the eighth abdominal vertebra, and immediately meet below its centrum, circum- 



scribing a canal for the aorta : they are continued under the same form, and are similarly 

 united in the succeeding abdominal vertebne to the fifteenth, where they are suddenly pro- 

 duced downwards to the commencement of the anal fin : a pair of very slender pleurapophyse* 

 is continued from the lower united part of the parapophyses of the six posterior abdominal 

 vertebne : similar ribs are continued from the under part of the bodies of some of thr 

 vertebrae anterior to these. The number of abdominal vertebne is 1 2 ; that of the caudal 

 vertebne is 18, =30. 



Mu. SoxtA. 



254. The skeleton of the Opah-fish (Lamptia guttata). 



The abdominal parapophyse* are short : the pleurapophyses are articulated to depressions 

 at their back part ; they progressively elongate as they approach the posterior part of the 

 abdomen, where they are of unusual length. The fronto-occipital spine rises to a great 



