312 



46 



another is to be found in the nasal organ. The triangulai* fossa just anterior to 

 the eye, where the nasal openings ought to be, shows in the male its hind part 

 beset with thin cutaneous lameliæ radiating from beneath a flap hanging down 

 from the upper margin of the fossa (PI. VII, fig. 0). The lameilæ are thin, low al 

 their upper end, enlarged below into projecting flaps; they are richly provided 

 with blood-vessels; in each a small vessel follows the margin and breaks up into 

 a network in the interior. In the female llie skin of the fossa is smooth and even. 

 Any real nasal openings I have not been able to detect. 



In the male of Sol. cyanopterus the height of the snout at the middle of its 

 length is greater than in the female, and the whole profile of the anterior part of 

 the head is different (cfr. fig. 6, PI. VII). The proportions of the height of the 

 snout to its length (from the front margin of the eye to the end) are in the male 

 about as 1 to 3, in the female ca. 1 to 4. In Sol. paradoxus there seems not to be 

 any marked sexual difference in the form of the snout ; but the material of this 

 species at my disposal is too scanty and besides not well enough preserved for 

 settling this point with certainty. 



No lateral line canals are to be found, neither on the head nor on the body. 



The following measurements have been made on 5 specimens of S. cyanopterus 

 and 2 of S. paradoxus. Of S. cyanopterus specimens A and C are from Zanzibar, 

 kindly lent me from the R. Museum at Berlin, the others, S. paradoxus included, are 

 from Japan (S. cyanopterus B and D from Jogashima, E from Boshu, Sagami Sea; 

 S. paradoxus B from Yenoura, Suruga Gulf). 



Exoskeleton. 



The dermal skeleton (PI. VII, fig. 6) is composed of large ossifications arranged 

 in transverse and longitudinal series, leaving large interspaces of naked skin. The 

 shape and arrangement as well as the number of these ossifications are almost the 



