212 TRTGITDJE. 



m. Adult : stuffed. Frith of Forth. 



n. Half-gro\ni. Frith of Forth, 



0. Adult : dried. Frith of Forth. Museum Leach. 



jp. Adult and half-grown. 



q, r. Adult. From the Haslar Collection. 



s, t. Half-grown. 



u-z. Half- grown. 



a. Adult. 



/3. Adult : dried. From Mr. Yarrell's Collection. 



y, 2. Adult: dried. 



e, a,. Adult: skin. 



ru d. Adult : skins. From Gronow's Collection. 



(. Adult female: skeleton: bad state. From the Haslar Collection. 



The skeleton shows several interesting peculiarities : the two tur- 

 binal bones are grown together, and situated in front of the snout, 

 where they form a flat prominence, superiorly with two pairs of 

 strong curved spines; they occupy the same place as the rostral 

 shield in snakes, and are somewhat similar to it. The intermax- 

 illaiy and maxillary are concealed beneath the edges of the tm-binal 

 and infraorbital bones ; the former is only half the length of the 

 latter ; the mandibulary is low, with several wide grooves leading 

 into the muciferous channel in the interior of the bone. The infra- 

 orbitals are very solid, and firmly joined to the turbinal and to the 

 pra)operculum ; their inferior edge is swollen, with a muciferous 

 channel in the interior, and with three large grooves ; the jjosterior of 

 the bones has a spine in its centre directed backwards and upwards. 

 The prajoperciilum has both the limbs of equal length, and meeting 

 at an acute angle, which is armed with a spine ; the muciferous 

 channel of the lower jaw is continued over both its limbs. The 

 operculum is triangular and striated, like the other bones of the skull. 

 The anterior frontals are smaU, without any prominence, and form 

 the front part of the orbit. The principal frontals arc broad, their 

 width between the orbits being much more than that of the orbit. 

 The interorbital space is concave. Each occipital bone and supra- 

 scapula has a very obtuse prominence, from which minute striae 

 radiate. The lower part of the brain-capsule is broad and flat. 



There are eleven abdominal and twenty-five caudal verfehrce, the 

 length of the former portion of the vertebral column being to that of 

 the caudal as 1 : 2*17. The ribs are thin and fragile ; the hDcmal, 

 neural, interhaemal and intemeural spines are exceedingly feeble and 

 short. 



2. Agonus acipenserinns. 



Phalangistes (i-ci'penseTnnus, Pall. Zoo(/r. Hosso-Asiat. iii. p. 110. tah. 17. 

 Agonus acipenserinus, Tiles. Mem. Acad. St. PHersh. 181.3, iv. p. 422. 



pi. 11. fig. 1-3. 

 Aspidophorus acipensei'inus, Cttv. 8f Val. iv. p. 207. 



B. 6. D. 8 I 7. A. 8. C. 13. V. 1/2. L. lat. 37. Vert, 12/27. 



Two dorsals, continuous at the base. Vomerine teeth none. 



