GARMAN: THE CHIMAEROIDS. 247 
gized with dorsal spines, or with the illicia of the Lophioids, though 
treated as if of similar nature by early authorities. 
The function of the tenacula below the bases of the ventyal fins is 
somewhat like that of the series of erectile hooks on the upper sides of 
the pectorals of some Platosomia, Raia ocellata, for instance. 
The lateral canal systems of Rhinochimaera and Harriotta are made 
up of pseudotubules, tubes narrowly slit outwardly ; that of Callorhyn- 
chus consists of tubes, and that of Chimaera is a system of grooves. 
The spiral intestine of Rhinochimaera is similar to that of the other 
living Chimaeroids. 
The first dorsal is short, erectile, and has a spine and radials in all 
members of this group. 
The second dorsal is long in the Chimaeridae, of medium length in 
the Rhinochimaeridae, and short in the Callorhynchidae. 
The armature of the supracaudal fin is peculiar to Rhinochimaera. 
The claspers of Rhinochimaera and Harriotta resemble one another ; 
except in being simple, they are unlike those of Callorhynchus ; in those 
of the Chimaeridae the cartilages are trifid. 
The claspers, intromittent organs, are possessed by both Plagiostomes 
and Chimaeroids ; the tenacula of the latter are peculiar to them. 
The position of the clasper of the Chimaeroid is rather above the edge 
of the ventral ; that of the Plagiostome is below it. 
Certain peculiarities of the Chimaeroids, especially of skull and brain, 
are perhaps best accounted for by supposing the group to have been 
derived primarily from a short-snouted and short-faced form, acquisition 
of the long snout and the prognathous condition of the skull afterward 
carrying the olfactory lobes and the hemispheres forward and separat- 
ing them from the balance of the brain and from one another, and in 
Chimaera a still later loss of the snout and shortening of the anterior 
part of the skull bringing the lobes and the hemispheres together into a 
single mass. 
Rhinochimaera pacifica. 
Plate 1, Fig. 1. 
Fariotta pacifica Mitsukuri, 1895, Zool. Mag. Tokyo, VII., without description. 
Rhinochimaera pacifica Garman, 1901, Proc. N. E. Zool. Club, IL., 75. 
The specimen here described is a fully developed male of about thirty-six 
inches in length, before a slight loss from the filamentary extremity of the tail. 
On account of the figure some of the details of shape need not be dwelt upon 
