Nos. IAND2.] ANATOMY OF SCOMBER SCOMBER. 173 



Just as I am sending this manuscript to press I have received 

 No. 2, Vol. X\'., of the Jourxal of ]\Iorphology. containing 

 Cornelia M. Clapp's paper on "The Lateral Line System of 

 Batrachiis Tan." In this fish the first and second groups of infra- 

 orbital organs above referred to are still more definitely separated 

 from each other than in Aiuia; and they are entirely separated 

 from the third and fourth groups, which together form a single 

 group. The first group is called by Clapp, as by me in Aiuia, the 

 antorbital part of the infraorbital line ; and the second group, be- 

 cause of its position, is called by her the maxillary branch of the 

 same line. The bone to which this maxillary canal is related 

 must, accordingly, be the lachrymal, or that bone plus the sub- 

 orbitals ; and it seems, from Clapp's Fig. 4, to have acquired articu- 

 lar relations with the skull. 



The fibrous or semi-cartilaginous tube that encloses the temporal 

 canal of her descriptions, and that is said to lie outside the muscles 

 covering the squamosal and occipital bones, nuist represent an- 

 other instance of that complete separation of the canal and mem- 

 brane portions of the squamosal to which I have already referred 

 in an earlier work (No. 9). 



That the organs of the main lateral lines of the body, in Batra- 

 chiis Tail, should be innervated by the ramus recurrens facialis, 

 and that the supratemporal branch of the vagus should issue from 

 the skull through a foramen in the supraoccipital bone, are such 

 radical departures from the conditions found in Aiiiia and Scom- 

 ber that I can attempt no comparison until I have had time to fur- 

 ther investigate the subject. 



2. Supraorbital Canal. 



The supraorbital canal begins at a pore on the dorsal surface 

 of the snout, not far from its anterior end. The tube leading from 

 this pore runs backward and laterally and enters the front end of 

 the nasal bone. Li that bone it runs backward, following the 

 somewhat sigmoidal line of the bone. Having issued at the hind 

 end of the bone it lies, at first, in an open groove on the dorsal 

 surface of the frontal, and then enters that bone, running directly 

 backward to a point nearly opposite the hind edge of the eye. 



