256 
MR, W. K. PARKER OR THE STRUCTURE AND 
represented by the suddenly narrowed part of this band, which runs back as the pith 
of the long oval palpus, right and left—a “ feeler” or barbel which reaches to the end 
of the abdomen. The lower labials are small, rounded rods, placed across the space 
between the long, slender mandibles, and not arranged as a semicircle to support a 
sucking disk. The hyoids are very massive; and the branchial pouches are all fused 
together into a case, with mere slits outside—through which the branchial tufts clo not 
protrude ; and with wider openings inside. 
The larval chondrocranium of Pipci is similar to that of Dactylethra, but differs in 
several particulars (ibid., Plates 60 , 61 ). The auditory capsules and cranial notochord 
reach almost half way to the frontal wall. The trabeculae are completely fused up to 
their retral cornua. The “sub-ocular fenestra” is a mere crescentic slit with its 
convexity outwards. The pterygo-palatine band is narrow and very small in front of 
that slit, and the pre-palatine projects forwards under the dilated end of each hook¬ 
shaped trabecular cornu. The nasal openings are nearer together; the quadrate condyles 
are wide apart but not so far forwards in position ; the pedicle is merely the inner and 
posterior horn of a four-winged, dilated, suspensorium ; the otic process is, already, 
nearly as wide as the pedicle, and longer. 
The condyle for the cerato-hyal is a large outwardly-projecting, oblique, pyriform 
process; over it there is a small orbitar process. The labials are scarcely chondrified 
as yet, and there are no palpi; as in Man , and the Pig, the Meckelian rods meet and 
coalesce, directly ; and I find no inferior labials. The cerato-hyals are large, oblong, 
square above, and with a hinder submesial process; they are entirely absorbed before 
hatching. 
Scarcely a trace of branchiae appear ; the intra-branchial arches are merely repre¬ 
sented by a basi-hypobranchiai band which, at the mid line, unites the extra-branchials. 
These are continuous above and below, and form a flat plate on each side with three 
lanceolate slits in it, and a dentated upper margin : this growth has its upper part 
largely absorbed on either side before hatching ; at which time a very remarkable hypo- 
basibranchial tract has developed, which in the early larva was merely a conj ugational 
band uniting the extra-branchials/* 
C.— Order of appearance of parts in the skull during metamorphosis in the 
“ Phaneroglossa.” 
The first splint-bone to appear in the Tadpole’s skull is the first we find in the 
gradation of the types, viz. : the parasphenoid, first seen, outside the merely “Cartila¬ 
ginous” Fishes, in the Acipenseridse and the Dipnoi. 
The former have no ex-occipital, but the latter have; this endoskeletal bone comes 
* For the transformation of these two extraordinary types of larval crania, I mnst refer to the former 
paper (Part II.); I still have to show how the adult skulls of the Aglossa differ from those of typical 
Phaneroglossa. 
