BONES OF LOPHIUS PISCATORIUS — MORROW. 347 



37. Epihyals : these bones are long. At their posterior ex- 

 tremities they are narrow and curved inwards and upwards 

 towards their junction with the stylohyals. They widen out at 

 their anterior extremities, where they present themselves as thin 

 bony plates. On their upper inner anterior edges there is on 

 each a splint, which unites it with its 



38. Ceratohyal : these, which are comparatively very long- 

 bones, have at their superior anterior extremities processes 

 which connect them with the epihyals, giving to them in situ the 

 appearance of having thickened superior edges. The Ceratohyals 

 on their lower posterior extremities present the same thin edges 

 and of equal width with the epihyals. In the anterior third of 

 their length, midway in these bones, on the outer side, is a groove 

 for the reception of part of the branchiostegal rays, of which two 

 on the inner side of the bones are the anterior, and four on the 

 groove mentioned the posterior. At about half their length on the 

 superior surfaces there is on each of these bones a process for their 

 attachment by ligament to the angulars and dentaries, and at 

 this point the bones are twisted so that their inferior are nearly 

 at right angles to their superior extremities. 



39. 40. Basihyals : these bones, two on each side form the 

 base of the hyoidean arch ; in the Lophius they are of irregular 

 shape, and the upper pair present long posterior processes which 

 unite them by sqamuous suture to the inner side of the cerato- 

 hyals at their upper anterior extremities ; the lower pair are 

 small, thin and somewhat triangular plates, which are attached 

 to the lower anterior extremities of the ceratohyals. In the 

 Cod the lower pair are much the larger bones. 



41. The glossohyal, which lies between the basihyals and the 



42. Urohyal, which is directly beneath it, are both . extreme- 

 ly small bones. 



43. The branchiostegals are very long and thin bones. There 

 are six on each side, and in the absence of ribs they serve to form 

 the large abdominal cavity of the Lophius. 



53. There are in the Lophius no representatives of the basi- 

 branchials.* 



* I have not yet found any; but will make further examination as soon as a new 

 specimen is obtained. 



